National Thermal Power Corporation conducts the exam for the recruitment of Diploma Trainees in different fields. The pattern of trainee exam in this post will help you to prepare systematically for NTPC recruitment exam.
NTPC Diploma Trainee written test pattern:
NTPC written test consists of a two hour paper with objective type questions. The paper has two parts: Technical & Aptitude. While the questions of Aptitude test is common, questions of the Technical test would depend on which among the four disciplines (Electrical, Mechanical, Civil, C&I) you belong to.
Part-I (Technical) of NTPC Written test paper consists of 68 & Part-II (Aptitude) consists of 32 objective type questions. Thus there are 100 total questions to be answered in 120 minutes.
Note: There is negative marking: 1/4th mark will be deducted for each wrong answer. So be careful while choosing the answer.
For Aptitude test, the questions asked are of type Test of reasoning, data interpretation.
WAY TO YOUR'S CAREER
Wednesday, July 14, 2010
NTPC PAPER 2008
NTPC PAPER EXAM HELD ON: 6 February 2008
11 An ice block submerged in the water, if the ice melts level of water (increase,decrease,remains same,none)
2 Simply supported beam with w point load at the middle, max. bending moment?(wl/4)
3 Simply supported beam with UDL ,max.deflection (wl4/384EI)
4 Cantilevel beam point load at tip,max.bending momemt comes at (end)
5 When bearing life L10 represents (bearings 10%survive,bearings 10% fails, none )
6 For welding high carbon steels which type of flame is used (oxidizing,carburizing,neutral,none)
7. Arrange the following cutting tools in decreasing order of machining hardness…Ceramics
8. When P1 and P2 are the loads acting on bearings with life L1 and L2 then L1/L2=?
L1/L2={P2/P1}10/3
9.Product simplification does not mean??
Product characterization
10 Which of the following process has the most scope in manufacturing?
CAD/CAM, CAM, CIM, All the above.
11. Concurrent engineering means?
(Manufacturing, designing, both,none)
12. Which manufacturing process yields higher output and increases worker productivity-
(process layout,line+process,functional layout)
13. 18-4-1 represents-, Tungsten-Cr-Vn
14 For which material is negative allowance provided-(Graphite,steel,bronze,cast iron)
15. What is the recrystallisation temperature of tin- (60,300,1000,none)
16. What is the purpose of borax in soldering-
17. Top gates are provided in which type of casting-(Shallow casting,simple,complex,none)
18. Which statement is true regarding simple gear trains-(i/p and o/p shafts r fixed, each shaft has 2 gears, i/p & o/p shafts r moving)
19. What is the purpose of normalizing- (Refining of grain structure)
20. As the grain size is decreased-(Hardness increases,corrosion resistance decreases,both)
21. Isothermal gas is filled in a vessel at a pressure P and temperature T then considering the compressible forces as the height increases pressure ??(linearly increases linearly decreases exponentially increase )
22. A bottle is filled with water and air and is tied to a string and is rotated in horizontal direction. Then in which direction will air bubble travel?
(bottom,neck,uniformly spread)
23. A empty bottle(in vaccum) filled with a gas at temp T and press P when the pressure of bottle reaches P temperature of the gas is _? (T,T/K,TK)
24. Bearing somerfield number _ with load on bearing?
(increases,decreases,no change)
25. Critical radius for a sphere is-(2k/h)
26. Critical radius exist for_ (spherical,cylindrical,both,slab)
27. Convectional resistance/internal resistance is called (biot number)
28. Nusselt no. is? (hl/k)
29. EOQ=?
30 Which statement is true regarding critical path method? (i only one critical path exists for a network, more than one with same duration,)
31. Shipment cost,inspection cost,storage cost comes under_ (carrying cost ,holding cost,)
32. Ischronous governers sensitivity is- (zero,infinite)
33. self energized brakes are-(friction moment acts in the direction of application of force,opposite to the direction of force, does not need a force to act ,)
34 The ratio of heat capacities for evaporator and condenser is_ (Zero,infinity)
35. when steam and air mixture with partial pressure 0.06 and 0.07 enters a condenser what is the condenser pressure? (0.06,0.07,0.53,0.03)
36. In pulverized burning of coal heat transfer from boiler to water occurs through_( predominant radiation, convection, conduction, conduction+convection)
37. Rankine cycle efficiency for same parameters increases mostly with_(reheat, regeneration, super heating )
38. Ericson cycle with all reversible processes assume_(carnot cycle,stirling,brayton
39. Air delivery tank at outlet of reciprocating compressor is provided for_ (provide constant pressure, avoid cavitation, )
40. High speed centrifugal pump has _?
(vanes faces in forward direction side,backward,radial vanes)
41. Thermal efficiency in decreasing order_?
(Otto cycle>dual cycle>diesel cycle)
42. When a 1000 K body comes in contact with atmosphere at 300K a loss of 9000 KJ heat is transferred. The net available energy transferred is_
43. When entropy of a system increases_?
(unavailable energy increases )
44. Rolling is a process widely used for_?
(I section,tubes)
45. Tool nomenclature_?
46. In francis turbine movement of steam?
47. For low power consumption _?
(rake angle should be increased / decreased, nose angle increased/ decreased)
47. Continuous chips occur in_?
(High speeds,low speeds,both,none)
48. Primary forces in a reciprocating engine_?
(fully balanced, partially balanced, completely unbalanced, none)
49. In proximate analysis pyrogallol is used for analysis of which element_?
(nitrogen,oxygen)
50. Sulphur content in fuel greatly affects_?
(corrosion)
51. Heat transfer through radiation can be increased by_?
(decreasing emissivity and increases temperature of hot body)
52. which theory of failure clearly explains the failure in case of ductile material?
(Maximun shear stress theory or Guests or trescas theory)
53. When a material is subjected to continuous cycles which limit is being verified?
(Endurance limit)
54. where is stress concentration maximum?
(notches, stress reducing throughcuts)
55. Power transmitted through a belt drive_?
P(T2-T1)
56. According to Eulers theory crippling or buckling load is
(Wcr = Cp2EI/l2)
57. During sensible heating, specific humidity_?
(remains constant)
58. COP of a refrigerator is _?
(greater than 1 )
59. The maximum temperature in a refrigeration cycle is_?
(less than/greater than/equal to critical temperature)
60. The pressure at the throat of the nozzle_?
(maximum,min)
61. for a statically determinate set of forces for equilibrium_?
(? f(X),f(Y),f(Z)=0,?M=0)
62. For a statically determinate set of forces-
(there r as many equations as the no. of unknowns)
63. 1-2-3 analysis is used for_?
(1.break even analysis, ??)
64. A problem on mean time of service something like a salesman has a rating of 120. considering 10% allowance time calculate the time required to serve 120???
65. A problem n determining time in a queue??
66. Energy equation for a laminar flow is _?
(Uniform and steady ,non uniform and unsteady)
67. Undercuts in welding occurs due to_?
(low welding current,high welding current)
68. Work holding equipment in shearing??
69. At the centre of a nozzle _?
(Mach no<1 >=1;=1)
11 An ice block submerged in the water, if the ice melts level of water (increase,decrease,remains same,none)
2 Simply supported beam with w point load at the middle, max. bending moment?(wl/4)
3 Simply supported beam with UDL ,max.deflection (wl4/384EI)
4 Cantilevel beam point load at tip,max.bending momemt comes at (end)
5 When bearing life L10 represents (bearings 10%survive,bearings 10% fails, none )
6 For welding high carbon steels which type of flame is used (oxidizing,carburizing,neutral,none)
7. Arrange the following cutting tools in decreasing order of machining hardness…Ceramics
8. When P1 and P2 are the loads acting on bearings with life L1 and L2 then L1/L2=?
L1/L2={P2/P1}10/3
9.Product simplification does not mean??
Product characterization
10 Which of the following process has the most scope in manufacturing?
CAD/CAM, CAM, CIM, All the above.
11. Concurrent engineering means?
(Manufacturing, designing, both,none)
12. Which manufacturing process yields higher output and increases worker productivity-
(process layout,line+process,functional layout)
13. 18-4-1 represents-, Tungsten-Cr-Vn
14 For which material is negative allowance provided-(Graphite,steel,bronze,cast iron)
15. What is the recrystallisation temperature of tin- (60,300,1000,none)
16. What is the purpose of borax in soldering-
17. Top gates are provided in which type of casting-(Shallow casting,simple,complex,none)
18. Which statement is true regarding simple gear trains-(i/p and o/p shafts r fixed, each shaft has 2 gears, i/p & o/p shafts r moving)
19. What is the purpose of normalizing- (Refining of grain structure)
20. As the grain size is decreased-(Hardness increases,corrosion resistance decreases,both)
21. Isothermal gas is filled in a vessel at a pressure P and temperature T then considering the compressible forces as the height increases pressure ??(linearly increases linearly decreases exponentially increase )
22. A bottle is filled with water and air and is tied to a string and is rotated in horizontal direction. Then in which direction will air bubble travel?
(bottom,neck,uniformly spread)
23. A empty bottle(in vaccum) filled with a gas at temp T and press P when the pressure of bottle reaches P temperature of the gas is _? (T,T/K,TK)
24. Bearing somerfield number _ with load on bearing?
(increases,decreases,no change)
25. Critical radius for a sphere is-(2k/h)
26. Critical radius exist for_ (spherical,cylindrical,both,slab)
27. Convectional resistance/internal resistance is called (biot number)
28. Nusselt no. is? (hl/k)
29. EOQ=?
30 Which statement is true regarding critical path method? (i only one critical path exists for a network, more than one with same duration,)
31. Shipment cost,inspection cost,storage cost comes under_ (carrying cost ,holding cost,)
32. Ischronous governers sensitivity is- (zero,infinite)
33. self energized brakes are-(friction moment acts in the direction of application of force,opposite to the direction of force, does not need a force to act ,)
34 The ratio of heat capacities for evaporator and condenser is_ (Zero,infinity)
35. when steam and air mixture with partial pressure 0.06 and 0.07 enters a condenser what is the condenser pressure? (0.06,0.07,0.53,0.03)
36. In pulverized burning of coal heat transfer from boiler to water occurs through_( predominant radiation, convection, conduction, conduction+convection)
37. Rankine cycle efficiency for same parameters increases mostly with_(reheat, regeneration, super heating )
38. Ericson cycle with all reversible processes assume_(carnot cycle,stirling,brayton
39. Air delivery tank at outlet of reciprocating compressor is provided for_ (provide constant pressure, avoid cavitation, )
40. High speed centrifugal pump has _?
(vanes faces in forward direction side,backward,radial vanes)
41. Thermal efficiency in decreasing order_?
(Otto cycle>dual cycle>diesel cycle)
42. When a 1000 K body comes in contact with atmosphere at 300K a loss of 9000 KJ heat is transferred. The net available energy transferred is_
43. When entropy of a system increases_?
(unavailable energy increases )
44. Rolling is a process widely used for_?
(I section,tubes)
45. Tool nomenclature_?
46. In francis turbine movement of steam?
47. For low power consumption _?
(rake angle should be increased / decreased, nose angle increased/ decreased)
47. Continuous chips occur in_?
(High speeds,low speeds,both,none)
48. Primary forces in a reciprocating engine_?
(fully balanced, partially balanced, completely unbalanced, none)
49. In proximate analysis pyrogallol is used for analysis of which element_?
(nitrogen,oxygen)
50. Sulphur content in fuel greatly affects_?
(corrosion)
51. Heat transfer through radiation can be increased by_?
(decreasing emissivity and increases temperature of hot body)
52. which theory of failure clearly explains the failure in case of ductile material?
(Maximun shear stress theory or Guests or trescas theory)
53. When a material is subjected to continuous cycles which limit is being verified?
(Endurance limit)
54. where is stress concentration maximum?
(notches, stress reducing throughcuts)
55. Power transmitted through a belt drive_?
P(T2-T1)
56. According to Eulers theory crippling or buckling load is
(Wcr = Cp2EI/l2)
57. During sensible heating, specific humidity_?
(remains constant)
58. COP of a refrigerator is _?
(greater than 1 )
59. The maximum temperature in a refrigeration cycle is_?
(less than/greater than/equal to critical temperature)
60. The pressure at the throat of the nozzle_?
(maximum,min)
61. for a statically determinate set of forces for equilibrium_?
(? f(X),f(Y),f(Z)=0,?M=0)
62. For a statically determinate set of forces-
(there r as many equations as the no. of unknowns)
63. 1-2-3 analysis is used for_?
(1.break even analysis, ??)
64. A problem on mean time of service something like a salesman has a rating of 120. considering 10% allowance time calculate the time required to serve 120???
65. A problem n determining time in a queue??
66. Energy equation for a laminar flow is _?
(Uniform and steady ,non uniform and unsteady)
67. Undercuts in welding occurs due to_?
(low welding current,high welding current)
68. Work holding equipment in shearing??
69. At the centre of a nozzle _?
(Mach no<1 >=1;=1)
NTPC Previous Year Paper 4 May 2008 (Technical)
NTPC PAPER ON 4th MAY KOLKATA
Technical ( control and instrumentation):
1. expression for ?(n): u(n)-u(n-1)/ u(n-1)-u(n+1)/ u(n)+u(n+1)/...
2. numerical on a photodiode: to calculate the responsivity/sensitivity when a specified no of incident photons cause a specified no of electron generation.
3. for a radioactive sample which decays to 12.5% of its initial value in x days, the half life is given by..
4. connect two 1? resistors in series, then connect two 1H inductors across one of the resistors such that the ckt looks like a 1? resistor in series with a ?-section of a resistor and two inductors. With the series resistance on the i/p side, calc the transfer function of this ckt
5. AC signal conditioning is used for inductive and capacitive/resistive/piezoelectric transducers/all of the above.
6. lower useful input limit of a transducer is determined by
7. air-cored inductors are used for low frequency/high frequency/equal frequency operations.
8. given 4 pole-zero plots identify which one corresponds to the driving point impedance of a series resonant ckt.
9. given four unit-circle plots identify the one corresponding to a bandpass filter.
10. the sequence (2,3,4,3) is circularly even/circularly odd/circularly zero/both circularly even and odd.
11. z-transform of 3n u(n).
12. match the following with their characteristics: LED/LCD/nixie tube/optical fibre.
13. a 4 kHz signal is sampled at thrice the Nyquist rate and sent through a channel with error ?1%. Calc the bandwidth of the channel.
14. given an op-amp ckt obtain an expression for o/p voltage.
15. no. of encirclements made about the origin of the nyquist plot of the open loop TF:1/[(s-1)(s+2)(s+3)].
16. given a two port network in the form of a T find o/p admittance in terms of y-parameters.
17. for a repeater in a PCM cable identify the correct sequence of actions amongst threshold/equalization/etc.
18. o/p of a delta modulator when a ramp input is fed to it.
19. steady state error with ramp i/p for a type-0 system.
20. creeping occurs in energy meters bcoz.
21. ultrasonic method of flow measurement cannot be used in liquids with air bubbles/has less attenuation in air compared to liquid-identify the false statement (if any) among these.
22. major cause of losses in a fibre optic cable: dispersion/total internal refraction/presence of core and cladding/
23. which layer in the OSI model is concerned with printer buffering,etc: network/session/transport/
24. given some function F(j?) calc its inverse CTFT.
25. relation between laplace and z-transform: s=z/ s=ln z/ s=( ln z/T) /
26. maxm and minm probability error among ASK,PSK,FSK,DPSK etc
27. which of the following is a non linear modulation scheme: PAM/QAM/PCM/
28. match the following functions: e-t , e-t + et, sin(?t) with causal and stable system, causal and unstable system, etc.
29. given a ckt with a 50 ? resistor in series between two voltage sources of 10 V and 5 V magnitude calc power delivered by 5 V source.
30. laplace transform of e-3tu(t)+e2tu(-t).
31. which photodetector has output affected by own intrinsic noise: PN/APD/PIN/all.
32. inverse laplace transform of 1/s2[d/ds(e-3s/s)]
33. when I mode is added to proportional control system stability increases/ decreases/ steady state performance deteriorates/damping increases.
34. reset control is another name for integral/derivative/proportional/. Control.
35. time response of system having transfer function 625/(s2+25) will be of the form
36. given some transfer function calc the peak response time.
37. the nyquist sampling rate of the function [sin(at)/t]2 will be
38. the feedback topology that results in increased i/p and o/p impedance is current series/voltage series/current shunt voltage shunt.
39. numerical on cardiac output calculation given heart rate and volume per beat.
40. in an ECG instrumentation amplifier the differential gain is provided by 1st stage/2nd stage/mismatched resistors/output stage.
41. repeat ques 40 above for the classic 3-op amp instrum amplifier.
42. EMG signals are of the order of mV/V/?V/
43. computer assisted tomography is used for
44. numerical on electrostatic instrument, to calculate deflection given spring constant, torque etc.
45. to prevent loading of a ckt i/p impedance of a CRO should bee high/low/inductive/capacitive.
46. addition of a zero to a 2nd order underdamped system results in increase/decrease of rise time and increase/decrease of peak overshoot.
47. for PI ctrl we obtain improved bandwidth/improved steady state performance/ worsened steady state performance/
48. SNR of normal AM system is comparable/3 dB lower/3 dB higher/6 dB lower over DSB-SC and SSB system.
49. which is an effective measure of the noise related performance of an amplifier: SNR/noise ratio/thermal noise/shot noise.
50. given baseband signal freq and carrier freq calc which of the freq given will not be present for conventional AM.
51. distinction between FM and PM at high frequencies.
52. which of these has the least propagation delay RTL/ECL/I2L/CMOS.
53 switching speed of CMOS is affected/unaffected by changes in supply voltage.
54. which of these provides a measure of heart rate P/QRS complex/T/none of these.
55. given a ckt of a logarithmic amplifier you had to identify what ckt was it.
56. JFET can operate in depletion/enhancement/both/none of the above modes.
57. when a BJT operates in saturation the junctions are fwd biased/reverse biased/
58. BIBO stability criterion implies that poles are within/outside/on the unit circle.
59. for faithful amplification of low amplitude signals the cut-off/active/saturation regions of a transistor is used.
60. lissajous pattern of a signal rotates 36 times per minute. if the oscillator frequency is 560 kHz then the unknown freq is
61. % resolution of a 10 bit ADC.
62. to obtain 10 mV resolution on 5 V range how many bit DAC is to be used..
63. why is LCD preferred to LED.
64. how will 0.6973 be displayed on 10 V range of a 4 digit multimeter.
65. which of the following cannot be used for an automatic feedback temp ctrl system thermocouple/thermometer/thermistor/IC sensor.
66. y(n)=x(-n+3) is an example of a linear/non linear and shift variant/invariant system.
67. the falling body method is used to determine viscosity/humidity/.
68. which of these methods of viscosity measurement gives greatest accuracy falling body method/rotating cylinder method/both/
69. some question on gas chromatography
70.a device having a rotor with 3 Y-connected coils and a stator is likely to be a synchro/RVDT/control transformer/
71. in a twisted ring counter the initial count is 1000. after the 4th clock pulse its state will be.
72. a 240 kHz signal is given into a 3 bit binary ripple counter. The lowest o/p freq obtainable is.
73. for parity bit checking which of the following gates can be used XOR/NAND/OR/XNOR.
74. why is a BJT called so..
75. identify the expression for gauge factor of a strain gauge among the given options.
76. in a semiconductor strain gauge as tensile strain is applied what changes take place in the n and p areas..
77. how does a radioactive level gauging system work
78. a capacitive transducer measuring level works on the principle of change in distance between plates/change in dielectric strength/
79. for maximum power transfer in an AC circuit the condition to be satisfied is ZL+ZS=0/XL+XS=0/none of these/.where l and s refers to load and source resp.
80. find the transfer function from a block diagram.
81. synchronous ctrs are preferred to asynchronous ctrs bcoz they are faster/glitches at the output can be avoided/both/none of these.
82. the lissajous figure formed on an oscilloscope looks like the English figure of 8. if the vertical channel input is 1 kHz the horizontal input freq is.
83. IE=IC for a transistor in saturation/cutoff/active/both saturation and active regions.
84. reproducibility of measurements is called accuracy/precision/linearity/none of these.
85. which of these is not strictly a static characteristic accuracy/precision/tolerance/linearity.
86. the shunt coil in a Q meter has resistance of the order of m?/?/k?/..
87. for measuring inductance of high Q coils the bridge used is Maxwell-wien/Schering/
88. which of these measures inductance in terms of capacitance Maxwell and hay/Maxwell and Schering/hay and Schering/
89. in a flip-flop with preset and clear inputs both are applied simultaneously/clear is cleared when preset is applied/preset is cleared when clear is applied/.
90. what happens when the RET instruction is encountered by 8085
91. a 1024*8 memory chip needs how many address lines
92. what happens when the PUSH instruction is encountered by 8051.
93. in FM relation between no of sidebands w.r.t. modulating freq
94. numerical on DPSK.
95. a multiplexer accepts input data and provides one output all the time/one output at a time/many outputs at a time/many outputs all the time.
96. pulse modulation is essentially a process of multiplexing/.
97. wave shape is altered by clipper/clamper/voltage doubler/amplifier.
98. 4 signals of frequencies 100,100,200 and 400 Hz are sampled at nyquist rate and sent through TDM on a channel.the bandwidth of the channel is
99. superposition can be applied to a ckt with initial conditions/non-linear ckt/
100. kelvins double bridge is used for the measurement of
101. which of these is not an active transducer thermocouple/solar cell/RTD/none of these.
102. oscillator using positive feedback has gain of 0/?/undefined value/
103. wien bridge oscillator should initially have closed loop gain >3/<3/=3/
104. some question on gain margin and phase shift of a system.
105. fourier series expansion of even function has sine terms only/cosine terms only/no odd harmonics/
106. full wave rectifier gives clean dc o/p/dc o/p with small ripple/positive half and inverted negative half of i/p as o/p.
107. which of these values of ? gives damped oscillations: 0/1/1.6/0.6
108. for a transformer of ratio 1:a and excited by a source V with impedances Z1 and Z2 on the primary and secondary side value of a for maxm power transfer should be..
109. fourier transform of cos(?0t) is
110. at t=0 the step response of a 1st order system is.
111. 555 can be used as a monostable/astable/freq dividing ckt/all of these.
112. in a PT when the secondary is open ckted with the primary excited what will happen.
113. if a system is marginally stable then the nature of oscillations will be
114. linear encoders mostly use straight binary/BCD/gray code.
115. for an accelerometer working in displacement mode the ratio of forcing freq to natural freq should be..
NTPC Previous Year Paper 12 April 2009
NTPC Previous Year Paper 12 April 2009
Electrical Engineering
1. What is causal system?
2. Shunt reactor is used in EHV transmission line for
3. 20w, 40W, & 200w lamps are connected to three phases if neutral wire breaks then which lamp will fuse first? 1) 20 2)40 3)200 three lamps will fuse together.
4. Synchronous machine can be operated at both lagging and leading power factor
5 What does synchronous speed mean?
6. Frequency of emf generated per rotation of rotor is equal to.
7. DC machine having wave winding is wounded as lap winding what will be the effect on emf generated
8 Which is remain unchanged in transformer action?
9. In transformer windings are connected.?
10. In general how transformer is rated?
11. What is given on the name plate of motor? 1) KW 2) KVA 3) output shaft power
12. Short circuit test of transformer gives what?
13. Transformer core are laminated for what purpose?
14. What is supply voltage for heavy industry .1) 33KV 2) 11KV 3) 132 KV 4) 66KV
15. Basic structure SCR as a two transistor i.e. how they are connected?
16. What is Triac?
17. System admittance is (G+jB) what is reactive power absorbed if the voltage is V KV? (1) V (square)*B (2) V (square)*g .
18. In series R-L circuit what is phase difference between the voltage drop across R and L?
19. Power factor is cosine (delta ) delta is the angle between 1) phase voltage phase current 2)
Line voltage lone current 3) phase voltage line current 4) line voltage phase current.
20. Laplace of exp (-at)?
21. For series R-L-C circuit the load will be capacitive if the frequency is 1) greater than the resonant frequency 2) less than the resonant frequency 3).
22. In Wiens bridge which circuit elements determine the frequency range?
23. What is the output if two booster having duty cycle K and (K-1) are connected in series?
24. If a DC shunt motor is loaded from unloaded condition what will be effect of on terminal voltage?
25. A second wire system having one pole one right half of the s-plane. When the system will be stable?
26. A system having repetitive pole what will be effect on the gain at the cross over frequency?
27. Hollow conductor is used to reduce corona loss how does it reduce the loss?
28. In DC machine how voltage is related to flux?
29. Nature of current and voltage in the armature and at the terminal in DC machine.
30. Motor acts on the principle of ..rule
31. Which instrument measure both ac and dc?
32. How the rotation of induction motor is reversed?
33. If 3-phaseof a 3- phase balance load are reversed what will be the effect on the line current?
34. If the rating of VAR absorber is 50MVAR at 400KV. What will the VAR absorbed by the absorber at 300KV?
35. In regenerative breaking of DC series motor what is done?
36. Definitions of Fourier transform?
37. Laplace of f(t) is F(S) what is Laplace of f(t+T) .
38. Z-transform of sampled function x(n) for n>0.
39. Laplace transform of impulse function.
40. Z-transform of unity.
41. How many slip rings are there in 3phase synchronous motor?
42. How the speed of synchronous motor is controlled?
43. Speed control of induction motor?
44. When power supply is supplied to heater coil it glows while simple wire does not glow. Why?
45. A synchronous generator having inertia constant 4 and having rating of 100MVA. What will be energy stored by the machine?
46. A transformer having ratio 20:1. The secondary load is 0.6 ohm and the voltage across it is 6 V what will be the primary current?
47. A RC circuit having r=0.8ohm, c=2.5micofarad what will be the time constant?
48. Find load impedance if c=0.1 micro farad?
49. Two capacitors connected in series the equivalent capacitance is 0.03uf and when connected in parallel the equivalent capacitance is 0.16uf find out the ratio of the two capacitance?
50. An L-c circuit having frequency 1/sqrt (LC) what will the equivalent impedance?
51. An inverting op-am having input with resistance in series and a capacitance in feedback operates as a.?
52. A current having fundamental and third harmonics what will be the rms value of the current?
53. Peak to peak value of voltage if rms voltage is 100V.
54. Rms voltage.
55. What is the approx efficiency of nuclear power plant?
56. What is the average current of a single phase full wave rectifier firing at angle alpha?
57. What is the function of freewheeling diode?
58. When SCR stops conduction? (holding current)
59. For measuring current why shunt resistance is used?
60. For economic operation of plant what is the condition?(taking into account the penalty factor)
61. Incremental fuel cost of two plants is given and a load is given. Find out the load sharing for economic operation of the plant?
62. A two port network is represented by ABCD parameters. What will be condition for the two port network to be symmetrical?
63. Size of the conductor is determined by .
64. Which Surface is suitable for grounding?
NTPC MECHANICAL 02-05-2010 EXAM
1.A simple prblm on EOQ.
2.A prblm 4m LPP.u need 2 find d variables n calculate d maximum profit
3.A Question on ABC Analysis.
4.Around 3-4 questions wer askd. 4m HEAT TRANSFER.
5.A question 4m mohr's circle.
6.trusses n frames.
7."Product Standardization" is essential in wich case
a).batch production
b).job prodcn.
c).mass prodctn.
d).all d above
8.prblm on carnot cycle efficiency.
9.Kaplan turbine is wat type of turbine?
10.a question on safety(electrical insulation).
11.a question on safety(welding).
12.LMTD prblm 4m HEAT TRNSFR.
13.1 prblm on emissivity.
14.why is preheating necessary b4 welding? i dnt remembr. d options.
15.a question related 2 "concurrent engineering".
16.a prblm on venturimeter.(flow velocity)
17.a prblm 4m TOM.(I thnk flywheel).
18.whr r roller bearings used?
19.3 questions 4m MACHINE TOOLs i guess.
20.1 Questn. 4m Vibrations.
21.a questn. 4m piston(tdc n bdc).
22.2-3 questions 4m metrology.
23.Tds=dU+Pdv i used in case of wich process?????
24.which of d materials obey hook's law closely?(options wer rubber,elastic etc..)
2.A prblm 4m LPP.u need 2 find d variables n calculate d maximum profit
3.A Question on ABC Analysis.
4.Around 3-4 questions wer askd. 4m HEAT TRANSFER.
5.A question 4m mohr's circle.
6.trusses n frames.
7."Product Standardization" is essential in wich case
a).batch production
b).job prodcn.
c).mass prodctn.
d).all d above
8.prblm on carnot cycle efficiency.
9.Kaplan turbine is wat type of turbine?
10.a question on safety(electrical insulation).
11.a question on safety(welding).
12.LMTD prblm 4m HEAT TRNSFR.
13.1 prblm on emissivity.
14.why is preheating necessary b4 welding? i dnt remembr. d options.
15.a question related 2 "concurrent engineering".
16.a prblm on venturimeter.(flow velocity)
17.a prblm 4m TOM.(I thnk flywheel).
18.whr r roller bearings used?
19.3 questions 4m MACHINE TOOLs i guess.
20.1 Questn. 4m Vibrations.
21.a questn. 4m piston(tdc n bdc).
22.2-3 questions 4m metrology.
23.Tds=dU+Pdv i used in case of wich process?????
24.which of d materials obey hook's law closely?(options wer rubber,elastic etc..)
NTPC EXECUTIVE TRAINEE EXAM PAPER
NTPC Executive Trainee Test Previous Year Exam Paper
Technical Paper
1. Given four unit-circle plots identify the one corresponding to a bandpass filter.
2. A 4 kHz signal is sampled at thrice the Nyquist rate and sent through a channel with error ?1%. Calc the bandwidth of the channel.
3. Given a two port network in the form of a T find o/p admittance in terms of y-parameters.
4. Connect two 1? resistors in series, then connect two 1H inductors across one of the resistors such that the ckt looks like a 1? resistor in series with a ?-section of a resistor and two inductors. With the series resistance on the i/p side, calc the transfer function of this ckt
5. Inverse laplace transform of 1/s2[d/ds(e-3s/s)]
6. Lower useful input limit of a transducer is determined by?
7. Air-cored inductors are used for low frequency/high frequency/equal frequency operations.
8. Given 4 pole-zero plots identify which one corresponds to the driving point impedance of a series resonant ckt.
9. Expression for ?(n): u(n)-u(n-1)/ u(n-1)-u(n+1)/ u(n)+u(n+1)/?
10. The sequence (2,3,4,3) is circularly even/circularly odd/circularly zero/both circularly even and odd.
11. Z-transform of 3n u(n).
12. Match the following with their characteristics: LED/LCD/nixie tube/optical fibre.
13. Numerical on a photodiode: to calculate the responsivity/sensitivity when a specified no of incident photons cause a specified no of electron generation.
14. Given an op-amp ckt obtain an expression for o/p voltage.
15. No. of encirclements made about the origin of the nyquist plot of the open loop TF:1/[(s-1)(s+2)(s+3)].
16. For a radioactive sample which decays to 12.5% of its initial value in x days, the half life is given by____
17. For a repeater in a PCM cable identify the correct sequence of actions amongst threshold/equalization/etc.
18. O/P of a delta modulator when a ramp input is fed to it.
19. Steady state error with ramp i/p for a type-0 system.
20. Creeping occurs in energy meters bcoz?
21. Ultrasonic method of flow measurement cannot be used in liquids with air bubbles/has less attenuation in air compared to liquid-identify the false statement (if any) among these.
22. Major cause of losses in a fibre optic cable: dispersion/total internal refraction/presence of core and cladding/?
23. Which layer in the OSI model is concerned with printer buffering,etc: network/session/transport/?
24. Given some function F(j?) calc its inverse CTFT.
25. Relation between laplace and z-transform: s=z/ s=ln z/ s=( ln z/T) /?
26. Maxm and minm probability error among ASK,PSK,FSK,DPSK etc
27. Which of the following is a non linear modulation scheme: PAM/QAM/PCM/?
28. Match the following functions: e-t , e-t + et, sin(?t) with causal and stable system, causal and unstable system, etc.
29. Given a ckt with a 50 ? resistor in series between two voltage sources of 10 V and 5 V magnitude calc power delivered by 5 V source.
30. Laplace transform of e-3tu(t)+e2tu(-t).
31. Which photodetector has output affected by own intrinsic noise: PN/APD/PIN/all.
32. AC signal conditioning is used for inductive and capacitive/resistive/
33. When I mode is added to proportional control system stability increases/ decreases/ steady state performance deteriorates/damping increases.
34. Reset control is another name for integral/derivative/
35. Time response of system having transfer function 625/(s2+25) will be of the form?
36. Given some transfer function calc the peak response time.
37. The nyquist sampling rate of the function [sin(at)/t]2 will be?
38. The feedback topology that results in increased i/p and o/p impedance is current series/voltage series/current shunt voltage shunt.
39. Numerical on cardiac output calculation given heart rate and volume per beat.
40. In an ECG instrumentation amplifier the differential gain is provided by 1st stage/2nd stage/mismatched resistors/output stage.
41. Repeat ques 40 above for the classic 3-op amp instrum amplifier.
42. EMG signals are of the order of mV/V/?V/?
43. Computer assisted tomography is used for?
44. Numerical on electrostatic instrument, to calculate deflection given spring constant, torque etc.
45. To prevent loading of a ckt i/p impedance of a CRO should bee high/low/inductive/capacitive.
46. Addition of a zero to a 2nd order underdamped system results in increase/decrease of rise time and increase/decrease of peak overshoot.
47. For PI ctrl we obtain improved bandwidth/improved steady state performance/ worsened steady state performance/?
48. SNR of normal AM system is comparable/3 dB lower/3 dB higher/6 dB lower over DSB-SC and SSB system.
49. Which is an effective measure of the noise related performance of an amplifier: SNR/noise ratio/thermal noise/shot noise.
50. Given baseband signal freq and carrier freq calc which of the freq given will not be present for conventional AM.
51. Distinction between FM and PM at high frequencies.
52. Which of these has the least propagation delay RTL/ECL/I2L/CMOS.
53 Switching speed of CMOS is affected/unaffected by changes in supply voltage.
54. Which of these provides a measure of heart rate P/QRS complex/T/none of these.
55. Given a ckt of a logarithmic amplifier you had to identify what ckt was it.
56. JFET can operate in depletion/enhancement/both/
57. When a BJT operates in saturation the junctions are fwd biased/reverse biased/?
58. BIBO stability criterion implies that poles are within/outside/on the unit circle.
59. For faithful amplification of low amplitude signals the cut-off/active/saturation regions of a transistor is used.
60. Lissajous pattern of a signal rotates 36 times per minute. if the oscillator frequency is 560 kHz then the unknown freq is?
61. % resolution of a 10 bit ADC.
62. To obtain 10 mV resolution on 5 V range how many bit DAC is to be used..
63. Why is LCD preferred to LED.
64. How will 0.6973 be displayed on 10 V range of a 4 ½ digit multimeter.
65. Which of the following cannot be used for an automatic feedback temp ctrl system thermocouple/thermometer/
66. Y(n)=X(-n+3) is an example of a linear/non linear and shift variant/invariant system.
67. The falling body method is used to determine viscosity/humidity/?
68. Which of these methods of viscosity measurement gives greatest accuracy falling body method/rotating cylinder method/both/?
69. Some question on gas chromatography
70. A device having a rotor with 3 Y-connected coils and a stator is likely to be a synchro/RVDT/control transformer/?
71. In a twisted ring counter the initial count is 1000. after the 4th clock pulse its state will be?
72. A 240 kHz signal is given into a 3 bit binary ripple counter. The lowest o/p freq obtainable is?
73. For parity bit checking which of the following gates can be used XOR/NAND/OR/XNOR.
74. Why is a BJT called so..
75. Identify the expression for gauge factor of a strain gauge among the given options.
76. In a semiconductor strain gauge as tensile strain is applied what changes take place in the n and p areas..
77. How does a radioactive level gauging system work?
78. A capacitive transducer measuring level works on the principle of change in distance between plates/change in dielectric strength/?
79. For maximum power transfer in an AC circuit the condition to be satisfied is ZL+ZS=0/XL+XS=0/none of these/?where l and s refers to load and source respectively.
80. Find the transfer function from a block diagram.
81. Synchronous ctrs are preferred to asynchronous ctrs bcoz they are faster/glitches at the output can be avoided/both/none of these.
82. The lissajous figure formed on an oscilloscope looks like the English figure of 8. if the vertical channel input is 1 kHz the horizontal input freq is?
83. IE=IC for a transistor in saturation/cutoff/active/both saturation and active regions.
84. Reproducibility of measurements is called accuracy/precision/linearity/
85. Which of these is not strictly a static characteristic accuracy/precision/tolerance/
86. The shunt coil in a Q meter has resistance of the order of m?/?/k?/..
87. For measuring inductance of high Q coils the bridge used is Maxwell-wien/Schering/?
88. Which of these measures inductance in terms of capacitance Maxwell and hay/Maxwell and Schering/hay and Schering/?
89. In a flip-flop with preset and clear inputs both are applied simultaneously/clear is cleared when preset is applied/preset is cleared when clear is applied/?
90. What happens when the RET instruction is encountered by 8085
91. A 1024*8 memory chip needs how many address lines?
92. What happens when the PUSH instruction is encountered by 8051.
93. In FM relation between no of sidebands w.r.t. modulating freq
94. Numerical on DPSK.
95. A multiplexer accepts input data and provides one output all the time/one output at a time/many outputs at a time/many outputs all the time.
96. Pulse modulation is essentially a process of multiplexing/?
97. Wave shape is altered by clipper/clamper/voltage doubler/amplifier.
98. 4 signals of frequencies 100,100,200 and 400 Hz are sampled at nyquist rate and sent through TDM on a channel.the bandwidth of the channel is?
99. Superposition can be applied to a ckt with initial conditions/non-linear ckt/?
100. Kelvin’s double bridge is used for the measurement of?
101. Which of these is not an active transducer thermocouple/solar cell/RTD/none of these.
102. Oscillator using positive feedback has gain of 0/?/undefined value/?
103. Wien bridge oscillator should initially have closed loop gain >3/<3/=3/?
104. Some question on gain margin and phase shift of a system.
105. Fourier series expansion of even function has sine terms only/cosine terms only/no odd harmonics/?
106. Full wave rectifier gives clean dc o/p/dc o/p with small ripple/positive half and inverted negative half of i/p as o/p.
107. Which of these values of ? gives damped oscillations: 0/1/1.6/0.6
108. For a transformer of ratio 1:a and excited by a source V with impedances Z1 and Z2 on the primary and secondary side value of a for maxm power transfer should be..
109. Fourier transform of cos(?0t) is?
110. At t=0 the step response of a 1st order system is?
111. 555 can be used as a monostable/astable/freq dividing ckt/all of these.
112. In a PT when the secondary is open ckted with the primary excited what will happen.
113. If a system is marginally stable then the nature of oscillations will be?
114. Linear encoders mostly use straight binary/BCD/gray code.
115. For an accelerometer working in displacement mode the ratio of forcing freq to natural freq should be?
Tuesday, July 6, 2010
AAI Syllabus for junior executives
airport authority of india (AAI) Syllabus for junior executives
exam for both posts are of objective type and after written exam there are interview for both post but there is an additional voice test for the post of Junior Executive ATC.
exam paper of both examination is of two hours and exam paper consists two sections technical section and non technical section. however there are no fixed number of questions in exam some times total number of question may be 100 oir some time it may be 150. technical section contains 55% to 60% (questions from electronics / communication / microwave / digital electronics / control system / computer / information technology) non technical questions contains 40% to 40 % questions (from general knowledge, English language, reasoning and general mathematics).
some model questions from technical section:
1. In a communication system, noise is most likely to affect the signal
(a) at the destination
(b) In the channel
(c) in the information source
(d) at the transmitter
2. Indicate the false statement. Fourier analysis shows that the saw tooth
wave consist of
(a) fundamental and subharmonic sine waves
(b) a fundamental sine wave and an infinite number of harmonics
(c) fundamental and harmonic sine waves whose amplitude decreases with
the harmonic number
(d) sinusoidal voltages, some of which are small enough to ignore in
practice
3. One of the following types of noise becomes a great importance at high
frequencies. Is the
(a) random noise
(b) shot noise
(c) impulse noise
(d) transit-time noise
4.Indicate the false statement. The square of the thermal noise voltage
generated by a resistor is proportional to
(a) its temperature
(b) Its resistance
(c) Boltzmann’s Constant
(d) the bandwidth over which it is measured
5.If the plate supply voltage for a plate modulated class C amplifier is V, the
maximum plate-cathode voltage could be almost as high as
(a)4v
(b)3v
(c)2v
(d)1v
6. Which one will be stable if characteristics equation is
(a) AS^2+BS+C
(b) AS^2-BS-C
(c) AS^4+BS^2+CS+D
(d) -AS^2+BS-C
7.When microwave follows curvature of the earth, this I know as
(a) fading
(b) Ducting
(c) troposphere scatter
(d) ionosphere reflection
8. Broadband long distance communications are originally made possible by
the advent of
(a) telegraph cables
(b) repeater amplifiers
(c) HF radio
(d) Geostationary satellites
9. Switching systems
(a) Improve the efficiency of data transfer
(b) are not used in data system
(c) require additional lines
(d) are limited to small data networks
10. Basic group B
(a) occupies the frequency range from 60 to 108 k hz
(b) consist of erect channels only
(c) is formed at the group translating equipment
(d) consist of five super group
11. In differential amplifiers, the common emitter current is made constant
(a) To make Ad (differential gain) very small
(b) To make Ac (common mode gain) very small
(c) To make the amplifier symmetrical
(d) To keep CMRR constant
12. Given BCD number 1001 0011, its decimal equivalent is
(a) 147
(b) 143
(c) 93
(d) 39
13. An amplifier has voltage gain of 50. this gain in db will be
(a) 17 db
(b) 31 db
(c) 34 db
(d) 68 db
14. In a E plane Tee, the output of the two rams are
(a) 180 degree out of phase
(b) In the same phase
(c) 90 degree out of phase
(d) none of these
15. waveguide are generally made of
(a) Aluminium
(b) Bronze
(c) Both (a) and (b)
(d) none of these
Answers
1.(b) 2.(a) 3.(d) 4.(a) 5.(a) 6.(a) 7.(b) 8.(b) 9.(a) 10.(a) 11.(b) 12.(c) 13.(c) 14.(a) 15.(c)
exam for both posts are of objective type and after written exam there are interview for both post but there is an additional voice test for the post of Junior Executive ATC.
exam paper of both examination is of two hours and exam paper consists two sections technical section and non technical section. however there are no fixed number of questions in exam some times total number of question may be 100 oir some time it may be 150. technical section contains 55% to 60% (questions from electronics / communication / microwave / digital electronics / control system / computer / information technology) non technical questions contains 40% to 40 % questions (from general knowledge, English language, reasoning and general mathematics).
some model questions from technical section:
1. In a communication system, noise is most likely to affect the signal
(a) at the destination
(b) In the channel
(c) in the information source
(d) at the transmitter
2. Indicate the false statement. Fourier analysis shows that the saw tooth
wave consist of
(a) fundamental and subharmonic sine waves
(b) a fundamental sine wave and an infinite number of harmonics
(c) fundamental and harmonic sine waves whose amplitude decreases with
the harmonic number
(d) sinusoidal voltages, some of which are small enough to ignore in
practice
3. One of the following types of noise becomes a great importance at high
frequencies. Is the
(a) random noise
(b) shot noise
(c) impulse noise
(d) transit-time noise
4.Indicate the false statement. The square of the thermal noise voltage
generated by a resistor is proportional to
(a) its temperature
(b) Its resistance
(c) Boltzmann’s Constant
(d) the bandwidth over which it is measured
5.If the plate supply voltage for a plate modulated class C amplifier is V, the
maximum plate-cathode voltage could be almost as high as
(a)4v
(b)3v
(c)2v
(d)1v
6. Which one will be stable if characteristics equation is
(a) AS^2+BS+C
(b) AS^2-BS-C
(c) AS^4+BS^2+CS+D
(d) -AS^2+BS-C
7.When microwave follows curvature of the earth, this I know as
(a) fading
(b) Ducting
(c) troposphere scatter
(d) ionosphere reflection
8. Broadband long distance communications are originally made possible by
the advent of
(a) telegraph cables
(b) repeater amplifiers
(c) HF radio
(d) Geostationary satellites
9. Switching systems
(a) Improve the efficiency of data transfer
(b) are not used in data system
(c) require additional lines
(d) are limited to small data networks
10. Basic group B
(a) occupies the frequency range from 60 to 108 k hz
(b) consist of erect channels only
(c) is formed at the group translating equipment
(d) consist of five super group
11. In differential amplifiers, the common emitter current is made constant
(a) To make Ad (differential gain) very small
(b) To make Ac (common mode gain) very small
(c) To make the amplifier symmetrical
(d) To keep CMRR constant
12. Given BCD number 1001 0011, its decimal equivalent is
(a) 147
(b) 143
(c) 93
(d) 39
13. An amplifier has voltage gain of 50. this gain in db will be
(a) 17 db
(b) 31 db
(c) 34 db
(d) 68 db
14. In a E plane Tee, the output of the two rams are
(a) 180 degree out of phase
(b) In the same phase
(c) 90 degree out of phase
(d) none of these
15. waveguide are generally made of
(a) Aluminium
(b) Bronze
(c) Both (a) and (b)
(d) none of these
Answers
1.(b) 2.(a) 3.(d) 4.(a) 5.(a) 6.(a) 7.(b) 8.(b) 9.(a) 10.(a) 11.(b) 12.(c) 13.(c) 14.(a) 15.(c)
ISRO Placement Paper
1.The minimum number of edges in a connected cyclic graph on n vertices is
a) n-1 b) n c) n+1 d)none of these
2.A full binary tree with n non leaf nodes contains
a) n nodes b) log n nodes c)2n-1 nodes d)2n nodes
3.The time complexity of shell sort
a) O(n) b) O(log n) c) O(n 1.2 ) d)O(n2)
4.The time taken to insert an element after an element pointed by some pointer
a) O(1) b) O(log n) c) O(n) d) O(nlogn)
5. what is the name given to the first generation computer?
a) Binary language b)Machine language c)Assembly language
6.The root directory of a disk should be placed
a) at a fixed address in main memory
b) at a fixed location on disk
c) anywhere on disk.
7.A top down parser generates
a) right most derivation
b) left most derivation
c) right most derivation in reverse
d) left most derivation in reverse
8.what is the name of the OS that reads and reacts in terms of actual time?
a)batch system
b)time sharing
c)real time
9.FDDI is a
a)ring network
b)star network
c)mesh network
10.Computer memory consists of
a)ROM
b)PROM
c)RAM
d)all the above
a) n-1 b) n c) n+1 d)none of these
2.A full binary tree with n non leaf nodes contains
a) n nodes b) log n nodes c)2n-1 nodes d)2n nodes
3.The time complexity of shell sort
a) O(n) b) O(log n) c) O(n 1.2 ) d)O(n2)
4.The time taken to insert an element after an element pointed by some pointer
a) O(1) b) O(log n) c) O(n) d) O(nlogn)
5. what is the name given to the first generation computer?
a) Binary language b)Machine language c)Assembly language
6.The root directory of a disk should be placed
a) at a fixed address in main memory
b) at a fixed location on disk
c) anywhere on disk.
7.A top down parser generates
a) right most derivation
b) left most derivation
c) right most derivation in reverse
d) left most derivation in reverse
8.what is the name of the OS that reads and reacts in terms of actual time?
a)batch system
b)time sharing
c)real time
9.FDDI is a
a)ring network
b)star network
c)mesh network
10.Computer memory consists of
a)ROM
b)PROM
c)RAM
d)all the above
HAL Placement Paper
HAL (Hindustan Aeronautics Ltd) - Sample Placement Question Papers
GENERAL INSTRUCTIONS TO CANDIDATES APPEARING FOR THE COMPETITIVE WRITTEN TEST OF TWO AND A HALF HOURS DURATION FOR SELECTION AS EXECUTIVE TRAINEES (TECHNICAL )
· The Question Booklets are broadly classified into five Disciplines as indicated below:
1) Aeronautical
2) Mechanical and Production
3) Metallurgy
4) Electrical and Electronics
5) Computer Science
· Each Question Booklet will have 160 Objective Type Questions, as indicated below:
General Awareness
(15 Questions)
General Engineering
(25 Questions)
Questions specific to the respective Disciplines indicated above (120 Questions)
Total
(160 Questions)
15 Marks
25 Marks
120 Marks
160 Marks
Notes
1. The Question Booklet for Mechanical and Production Disciplines will be the same and candidates will have to answer
questions for both Mechanical and Production Branches.
2. The Question Booklet for Electrical and Electronics Disciplines will be the same and candidates will have to answer
questions for both Electrical and Electronics Branches.
· There are no negative marks for incorrect answers.
· Please use the blank pages provided at the end of the Question Booklet only for any rough work.
· If any Candidate is found to be indulging in any kind of malpractice like copying, trying to talk to other candidates,
exchanging information, carrying/passing on chits of paper or any other mode to communicate with others, his/her
candidature shall be cancelled.
· Mobile Phones, Pagers, Beepers, any kind of Audio Devices, Digital Diaries, Organisers etc., shall not be permitted inside
the Examination Hall.
· Candidates will be required to appear for the Written Test at their own expense and will have to make their own
arrangements for boarding and lodging at the place of the Examination.
· Further consideration of the candidature after the Written Test will be subject to:-
1. Candidates having passed the final Engineering Examination in the specified Branches of Engg. indicated in the
Advertisement, from any recognised Institution/University, with 60% marks in the Aggregate of all Semesters for
General/OBC and 50% Marks in the aggregate of all Semesters for SC/ST Candidates.
2. Verification of Qualifications, Marks scored, Age, Caste (for SC/ST/OBC only), PWD (Person with Disability) /Ex-
Servicemen etc.
IMPORTANT
Candidates must ensure that they are in possession of the following documents/items, when they report at the Examination
Centre:
· Admit Card (with Passport Size photograph duly affixed).
· Proof of Identity having their photograph such as Passport, Voters’ ID Card, Driving License, ID Card issued by
the Academic Institution last attended etc., for verification by the Invigilator.
· HB Pencils, Eraser, Pen and Calculator.
GENERAL INSTRUCTIONS TO CANDIDATES APPEARING FOR THE COMPETITIVE WRITTEN TEST OF TWO AND A HALF HOURS DURATION FOR SELECTION AS EXECUTIVE TRAINEES (TECHNICAL )
· The Question Booklets are broadly classified into five Disciplines as indicated below:
1) Aeronautical
2) Mechanical and Production
3) Metallurgy
4) Electrical and Electronics
5) Computer Science
· Each Question Booklet will have 160 Objective Type Questions, as indicated below:
General Awareness
(15 Questions)
General Engineering
(25 Questions)
Questions specific to the respective Disciplines indicated above (120 Questions)
Total
(160 Questions)
15 Marks
25 Marks
120 Marks
160 Marks
Notes
1. The Question Booklet for Mechanical and Production Disciplines will be the same and candidates will have to answer
questions for both Mechanical and Production Branches.
2. The Question Booklet for Electrical and Electronics Disciplines will be the same and candidates will have to answer
questions for both Electrical and Electronics Branches.
· There are no negative marks for incorrect answers.
· Please use the blank pages provided at the end of the Question Booklet only for any rough work.
· If any Candidate is found to be indulging in any kind of malpractice like copying, trying to talk to other candidates,
exchanging information, carrying/passing on chits of paper or any other mode to communicate with others, his/her
candidature shall be cancelled.
· Mobile Phones, Pagers, Beepers, any kind of Audio Devices, Digital Diaries, Organisers etc., shall not be permitted inside
the Examination Hall.
· Candidates will be required to appear for the Written Test at their own expense and will have to make their own
arrangements for boarding and lodging at the place of the Examination.
· Further consideration of the candidature after the Written Test will be subject to:-
1. Candidates having passed the final Engineering Examination in the specified Branches of Engg. indicated in the
Advertisement, from any recognised Institution/University, with 60% marks in the Aggregate of all Semesters for
General/OBC and 50% Marks in the aggregate of all Semesters for SC/ST Candidates.
2. Verification of Qualifications, Marks scored, Age, Caste (for SC/ST/OBC only), PWD (Person with Disability) /Ex-
Servicemen etc.
IMPORTANT
Candidates must ensure that they are in possession of the following documents/items, when they report at the Examination
Centre:
· Admit Card (with Passport Size photograph duly affixed).
· Proof of Identity having their photograph such as Passport, Voters’ ID Card, Driving License, ID Card issued by
the Academic Institution last attended etc., for verification by the Invigilator.
· HB Pencils, Eraser, Pen and Calculator.
HAL Placement Paper
HAL (Hindustan Aeronautics Ltd) - Sample Placement Question Papers
1. partial differntiation of x^3*y^3/(x+y)^3
2. some points like (0,2,4), (2,5,-1) and (6,2,0) were given and were asked to find whether it is parabola, eclipse, carboid or
cycloid.
3. there were so mant conversion questions like binary to decimal, decimal to binary, decimal to oct, binary
mulitiplicationsetc.
4. some Laplace formula related to sine and cosine terms.
5. fouries series of quarter symmetry
6. by applying rouths Hurwitz criterion we were suppose to find the number of roots the equation was something like
2s^4+s^3+4s^2+s i think so
7. damping is proportional to gain, sqrt of gain, 1/gain or 1/sqrt of gain
8. vocabulary like germs:disease::, emulate:mimic::,
9. there questions about power plants like which plant correspond es to highest capital cost, highest running cost,lowest
operational cost, efficiency of thermal plant
10. what is the present capacity of unit generation 200MW, 210 MW, 375MW or 500 MW
11. where in nuclear power plant is located like kota, talcher, kolghat,
12. there was 1 question realed to idduki, ramagundam power plants i dont know whether it is the odd 1 out of the hydro
plants
13. there was 1 repeated questions related to the spacing b/w the phase conductors like 11m, 8m, 20m, 24m.
14. is meager related to hot wire instrument,moving coil or moving iron.
15. 1 question related to load factor.
16. in a two w/m method what is the condition for which both the w/ms are equal and opposite.
17. question based on inverter gate
18. question related to maximum overshoot.
19. 2 or 3 questions were related to step input, impulse i/p etc.
20. 1 question related to boolean algebra
21. some questing related to find the value of lambda to get no solution.
22. 1 question was related to find from the options of nquist criteria, bode plot, routh Hurwitz,
23. question related to expontial rise and fall of inductor.
24. given 2 poles and 50 hz freq to find the syn speed.
25. question based on inertia constant and p.u. values
26. question bead on power transfer capacity and voltage
27. SIL of 400 KV lines
28. 2 questions based on maximum power transfer capacity from circuit theory.
29. attitude ques of pipes and cisterns, compound interest, time and distance,cubes, hcf and lcm,multiplication,
30. for how many days there will food if 2 persons are supposed to leave. question related to this were asked.
31. questions related to angles i don't remember the questions i remember only the options like pi/3, pi/6,pi/4. 1, -1, 1/2
1/sqrt2. etc
32. question's based on P&V, P&Q, V&delta.
33. how many HVDC links are presently in use in India.
34. there were 4 questions like if A*B represents Ais the son of B, C/D represents Cis the husband of D then how A and D
are related.
35. to sort the odd number out from a box of given numbers.
36. Vrms and Vo of full wave rectifier
37. reflection coefficient of current of an open ended line.
1. partial differntiation of x^3*y^3/(x+y)^3
2. some points like (0,2,4), (2,5,-1) and (6,2,0) were given and were asked to find whether it is parabola, eclipse, carboid or
cycloid.
3. there were so mant conversion questions like binary to decimal, decimal to binary, decimal to oct, binary
mulitiplicationsetc.
4. some Laplace formula related to sine and cosine terms.
5. fouries series of quarter symmetry
6. by applying rouths Hurwitz criterion we were suppose to find the number of roots the equation was something like
2s^4+s^3+4s^2+s i think so
7. damping is proportional to gain, sqrt of gain, 1/gain or 1/sqrt of gain
8. vocabulary like germs:disease::, emulate:mimic::,
9. there questions about power plants like which plant correspond es to highest capital cost, highest running cost,lowest
operational cost, efficiency of thermal plant
10. what is the present capacity of unit generation 200MW, 210 MW, 375MW or 500 MW
11. where in nuclear power plant is located like kota, talcher, kolghat,
12. there was 1 question realed to idduki, ramagundam power plants i dont know whether it is the odd 1 out of the hydro
plants
13. there was 1 repeated questions related to the spacing b/w the phase conductors like 11m, 8m, 20m, 24m.
14. is meager related to hot wire instrument,moving coil or moving iron.
15. 1 question related to load factor.
16. in a two w/m method what is the condition for which both the w/ms are equal and opposite.
17. question based on inverter gate
18. question related to maximum overshoot.
19. 2 or 3 questions were related to step input, impulse i/p etc.
20. 1 question related to boolean algebra
21. some questing related to find the value of lambda to get no solution.
22. 1 question was related to find from the options of nquist criteria, bode plot, routh Hurwitz,
23. question related to expontial rise and fall of inductor.
24. given 2 poles and 50 hz freq to find the syn speed.
25. question based on inertia constant and p.u. values
26. question bead on power transfer capacity and voltage
27. SIL of 400 KV lines
28. 2 questions based on maximum power transfer capacity from circuit theory.
29. attitude ques of pipes and cisterns, compound interest, time and distance,cubes, hcf and lcm,multiplication,
30. for how many days there will food if 2 persons are supposed to leave. question related to this were asked.
31. questions related to angles i don't remember the questions i remember only the options like pi/3, pi/6,pi/4. 1, -1, 1/2
1/sqrt2. etc
32. question's based on P&V, P&Q, V&delta.
33. how many HVDC links are presently in use in India.
34. there were 4 questions like if A*B represents Ais the son of B, C/D represents Cis the husband of D then how A and D
are related.
35. to sort the odd number out from a box of given numbers.
36. Vrms and Vo of full wave rectifier
37. reflection coefficient of current of an open ended line.
HAL Placement Paper
HAL (Hindustan Aeronautics Ltd) - Sample Placement Question Papers
1) What is the distance between the EHV lines?
a)8m b)11m c)4m d)14m
2) At present how many HVDC lines are there in India?
a)none b)one c)two d)more than two
3) Where is the nuclear located in following places?
Ans: i don't remember the answers, but one of them is thatcher(orissa)
4) What is the approximate peak overshoot for a unity feedback system with damping factor 0.6?
a)10% b)5% c)15% d)20%
5) What is the distance between the EHV lines and earth?
a)8m b)11m c)18m d)15m
6) On no load in EHV lines what is the relation between receiving and sending end voltage?
Ans: receiving end voltage > sending end voltage
7) What is the surge impedance loading of 400kv line?
Ans: 4002/400ohms =400watts
8) similar question with surge impedance given as 160 ohms
Ans: 1000watts
9) If both the junctions of transistor are forward biased, in what region transistor works
Ans: saturation region
10) Where is the hydel power plant located in following places?
Ans: I don't remember the places
11) self GMD is used in the calculation of_______
a) inductance only
b) inductance and capacitance
c) capacitance only
d) none
12) What is the GMD if the distance between the lines are 6m,6m,12m?
ans: 7.058m( approx)
13) Zero sequence currents doesn't exist in the following fault
a) L-G
b) L-L
c) L-L-G
d) L-L-L-G
Ans: d
14) To avoid arcing connect suitable value of ________ in earthing.
a) capacitance
b) inductance
c) resistance
d) susceptance
15)There are two to three questions based on Laplace and Inverse Laplace transforms
16)In the following type of conductors the corona is minimum
a) circular
b) stranded
c) helical
d) rectangular
Ans: c
17)When do two watt meters show same value of opposite readings in two watt meter method
a) 300 lag
b) 600 lag
c) between 600 and 900 lag
d) zpf lag
ans: d
1 scheming bridge is used to measure
a) frequency
b) inductance
c) capacitance
d) mutual inductance
and: c
19) What is the value of resistance when both length and diameter of the wire are doubled?
ans: halved
20) There is one questions asked on Euler's formula..
21) What is the Laplace transform of unit ramp signal?
ans:1/s2
22) What happens to the value of inductance when self GMD is doubled?
23) At what frequency corona loss is more?
a) 50Hz
b) 60Hz
c)
d)
24) What is the largest rating of alternator manufactured in India?
a) 1000MW
b) 500MW
c) 1200MW
d) 250MW
ans:b
25) The response of an RLC circuit for impulse input?
a) exponentially raising
b) sinusoidal
c) exponential falling
d) parabolic
ans: c
26) What is the easier method for finding no. of poles in the right half of s-plane?
a) Nyquist plot
b) R-H criterion
c) Root-Locus method
d) Polor plot
ans: b
27) How many no of poles located in the right half of s-plane for the characteristic equation...
2 Burden of current transformers is measured in..
a) Watts
b) Volt Amperes
c) Ampere Hours
d) Joules
29)What is the gate used to get high output when all the inputs are low?
a) NOR
b) NAND
c) Ex-OR
d) Ex-NOR
ans: b
30) Large no of thyristors are used in HVDC transmission to improve______
a) current rating
b) voltage rating
c) Thyristors are available at high ratings
d)
31) What is the line current of a circuit when the current transformer of 1000:5 rating measures 4Amperes?
ans: 800A
32) If the time delay of relay with TMS setting 0.1 is 10 sec, then what is the time delaty when the TMS
setting is changed to 0.5
33) How many no of flip-flops are required to get 16 bit counter?
34) _________is connected to reduce frequency errors in ammeter.
a) shunt capacitor
b) series inductance
c) shunt inductance
d)
35)What is the value of ripple factor in Half Wave Rectifier?
a) 1.11
b) 0.8
c) 1.21
d)
36)The principle used in megger?
a) electrostatic effect
b) magnetic effect
c) Induction effect
d)
37)In electrodynamo meter type watt meter the error is due to..
a) pressure coil inductance
b) pressure coil resistance
c)
d)
3 In the following locations where is hydal power plant is not located?
ans: i don't remember the places
39) In distribution lines_____
a) X/R<0.1
b) X/R>10
c) X/R>1
d) X/R<0.01
40) In EHV lines _____
a) X/R=10
b) X/R=100
c)
d)
41) What is the speed of 2 pole alternator at 50Hz frequency?
ans: 3000rpm
42) What is the equivalent decimal no of (624)8
43) What is the binary equivalent of 6.25
44) What is the value of A+AB+B􀳦 ( B bar)
ans: 1
45) What are the avg and rms values of full wave rectifier
ans: 2Vm/pie, Vm/21/2
46) There is one question based on rank of matrix
47) What is the equivalent of cos(wt+18.750)
a) sin(wt+71.250)
b) sin(wt-71.250)
c) sin(wt+18.250)
d) sin(wt-18.250)
4 The three harmonics will be in phase with each other?_____
a) 3,5,15
b) 2,4,6
c)
d)
ans: a
49) The line current will be equal to phase current in______
ans: delta connection
50) In windmills the frequent problems occur in______
a) mechanical system
b) blades
c) electrodynamic system
d) electric system
51) The machine used in windmills is______
a) alternator
b) induction generator
c)
d)
ans: b
52) Insulators in EHV lines are designed based on_____
a) switching voltages
b) peak voltages
c) corona
d) lightning voltages
ans: a
53) The value of restriking voltage depends on______
a) inductance of line
b) capacitance of line
c) both
d) none
1) What is the distance between the EHV lines?
a)8m b)11m c)4m d)14m
2) At present how many HVDC lines are there in India?
a)none b)one c)two d)more than two
3) Where is the nuclear located in following places?
Ans: i don't remember the answers, but one of them is thatcher(orissa)
4) What is the approximate peak overshoot for a unity feedback system with damping factor 0.6?
a)10% b)5% c)15% d)20%
5) What is the distance between the EHV lines and earth?
a)8m b)11m c)18m d)15m
6) On no load in EHV lines what is the relation between receiving and sending end voltage?
Ans: receiving end voltage > sending end voltage
7) What is the surge impedance loading of 400kv line?
Ans: 4002/400ohms =400watts
8) similar question with surge impedance given as 160 ohms
Ans: 1000watts
9) If both the junctions of transistor are forward biased, in what region transistor works
Ans: saturation region
10) Where is the hydel power plant located in following places?
Ans: I don't remember the places
11) self GMD is used in the calculation of_______
a) inductance only
b) inductance and capacitance
c) capacitance only
d) none
12) What is the GMD if the distance between the lines are 6m,6m,12m?
ans: 7.058m( approx)
13) Zero sequence currents doesn't exist in the following fault
a) L-G
b) L-L
c) L-L-G
d) L-L-L-G
Ans: d
14) To avoid arcing connect suitable value of ________ in earthing.
a) capacitance
b) inductance
c) resistance
d) susceptance
15)There are two to three questions based on Laplace and Inverse Laplace transforms
16)In the following type of conductors the corona is minimum
a) circular
b) stranded
c) helical
d) rectangular
Ans: c
17)When do two watt meters show same value of opposite readings in two watt meter method
a) 300 lag
b) 600 lag
c) between 600 and 900 lag
d) zpf lag
ans: d
1 scheming bridge is used to measure
a) frequency
b) inductance
c) capacitance
d) mutual inductance
and: c
19) What is the value of resistance when both length and diameter of the wire are doubled?
ans: halved
20) There is one questions asked on Euler's formula..
21) What is the Laplace transform of unit ramp signal?
ans:1/s2
22) What happens to the value of inductance when self GMD is doubled?
23) At what frequency corona loss is more?
a) 50Hz
b) 60Hz
c)
d)
24) What is the largest rating of alternator manufactured in India?
a) 1000MW
b) 500MW
c) 1200MW
d) 250MW
ans:b
25) The response of an RLC circuit for impulse input?
a) exponentially raising
b) sinusoidal
c) exponential falling
d) parabolic
ans: c
26) What is the easier method for finding no. of poles in the right half of s-plane?
a) Nyquist plot
b) R-H criterion
c) Root-Locus method
d) Polor plot
ans: b
27) How many no of poles located in the right half of s-plane for the characteristic equation...
2 Burden of current transformers is measured in..
a) Watts
b) Volt Amperes
c) Ampere Hours
d) Joules
29)What is the gate used to get high output when all the inputs are low?
a) NOR
b) NAND
c) Ex-OR
d) Ex-NOR
ans: b
30) Large no of thyristors are used in HVDC transmission to improve______
a) current rating
b) voltage rating
c) Thyristors are available at high ratings
d)
31) What is the line current of a circuit when the current transformer of 1000:5 rating measures 4Amperes?
ans: 800A
32) If the time delay of relay with TMS setting 0.1 is 10 sec, then what is the time delaty when the TMS
setting is changed to 0.5
33) How many no of flip-flops are required to get 16 bit counter?
34) _________is connected to reduce frequency errors in ammeter.
a) shunt capacitor
b) series inductance
c) shunt inductance
d)
35)What is the value of ripple factor in Half Wave Rectifier?
a) 1.11
b) 0.8
c) 1.21
d)
36)The principle used in megger?
a) electrostatic effect
b) magnetic effect
c) Induction effect
d)
37)In electrodynamo meter type watt meter the error is due to..
a) pressure coil inductance
b) pressure coil resistance
c)
d)
3 In the following locations where is hydal power plant is not located?
ans: i don't remember the places
39) In distribution lines_____
a) X/R<0.1
b) X/R>10
c) X/R>1
d) X/R<0.01
40) In EHV lines _____
a) X/R=10
b) X/R=100
c)
d)
41) What is the speed of 2 pole alternator at 50Hz frequency?
ans: 3000rpm
42) What is the equivalent decimal no of (624)8
43) What is the binary equivalent of 6.25
44) What is the value of A+AB+B􀳦 ( B bar)
ans: 1
45) What are the avg and rms values of full wave rectifier
ans: 2Vm/pie, Vm/21/2
46) There is one question based on rank of matrix
47) What is the equivalent of cos(wt+18.750)
a) sin(wt+71.250)
b) sin(wt-71.250)
c) sin(wt+18.250)
d) sin(wt-18.250)
4 The three harmonics will be in phase with each other?_____
a) 3,5,15
b) 2,4,6
c)
d)
ans: a
49) The line current will be equal to phase current in______
ans: delta connection
50) In windmills the frequent problems occur in______
a) mechanical system
b) blades
c) electrodynamic system
d) electric system
51) The machine used in windmills is______
a) alternator
b) induction generator
c)
d)
ans: b
52) Insulators in EHV lines are designed based on_____
a) switching voltages
b) peak voltages
c) corona
d) lightning voltages
ans: a
53) The value of restriking voltage depends on______
a) inductance of line
b) capacitance of line
c) both
d) none
HAL Placement Paper
HAL (Hindustan Aeronautics Ltd) - Sample Placement Question Papers
Aeronautical Engineering
Air Fuel ratio in a jet engine will be of the order of:
(a) 10:1 (b) 15:1
(c) 20:1 (d) 60:1
Fighter bombers use following type of engine:
(a) Turbo-jet (b) Turbo-propeller
(c) Rocket (d) Ram-jet
Mechanical Engineering
Least shrinkage allowance is provided in the case of following:
(a) Brass (b) Aluminium
(c) Cast Iron (d) Steel
If V is the volume of metal in a casting and A its surface area, the time of solidification will be proportional
to:
(a) V, 1/A (b) V,1/A2
(c ) V2 ,1/A (d) V2, 1/A2
Fire tube boilers are limited to a maximum design working pressure of :
(a) 1 kg/cm2 (b) 6 kg/cm2
(C) 17 kg/cm2 (d ) 100 kg/cm2
Metallurgy
1. A dislocation represented by T is called:
(a) Positive edge dislocation
(b) Negative edge dislocation
(c) Positive screw dislocation
(d) Negative screw dislocation
2. The recrystallisation temperature of a cold worked material decreases with:
(a) Increase in the degree of deformation
(b) Increase in the initial grain size
(c) Increase in the temperature of cold working
(d) The presence of impurity
Electrical Engineering
1. In a thyrister full converter feeding a continuous load current, what is the duration each thyrister conducts
in a cycle?
(a) 60 0 (b) 90 0
(c) 120 0 (d) 180 0
2. In a three-phase induction motor, the rotor field runs at the following speed with Respect to the stator
structure:
(a) At synchronous speed in the direction of stator field
(b) At a slip speed in the direction of stator speed
(c) At synchronous speed in a direction opposite to that of stator field
(d) At zero speed
Electronics
1. In the hybrid parameter model of a transistor reverse transfer voltage ratio and forward transfer current
ratio are respectively given by:
(a) h11 and h21 (b) h12 and h11
(c) h21 and h11 (d) None of these
2. A Signal x(t) has the Fourier transform
X(?) = { 1 for | ? | < }W . Its first zero-crossing in time domain occurs at:
Otherwise
(a) 1/pW (b) W
( c) p/ W (d) None of these
Computer Science
1. Magnetic tapes are suitable to applications:
(a) When only a few records are to be accessed
(b) When most of the records are to be accessed
(c) Only when all the records are to be processed
(d) None of the above
2. A system in which 2 or more cpu’s are interconnnected and share a common
Main memory is called:
(a) Pipeline machine
(b) Multifunctional system
(c) Multiprocess
(d) None of these
Aeronautical Engineering
Air Fuel ratio in a jet engine will be of the order of:
(a) 10:1 (b) 15:1
(c) 20:1 (d) 60:1
Fighter bombers use following type of engine:
(a) Turbo-jet (b) Turbo-propeller
(c) Rocket (d) Ram-jet
Mechanical Engineering
Least shrinkage allowance is provided in the case of following:
(a) Brass (b) Aluminium
(c) Cast Iron (d) Steel
If V is the volume of metal in a casting and A its surface area, the time of solidification will be proportional
to:
(a) V, 1/A (b) V,1/A2
(c ) V2 ,1/A (d) V2, 1/A2
Fire tube boilers are limited to a maximum design working pressure of :
(a) 1 kg/cm2 (b) 6 kg/cm2
(C) 17 kg/cm2 (d ) 100 kg/cm2
Metallurgy
1. A dislocation represented by T is called:
(a) Positive edge dislocation
(b) Negative edge dislocation
(c) Positive screw dislocation
(d) Negative screw dislocation
2. The recrystallisation temperature of a cold worked material decreases with:
(a) Increase in the degree of deformation
(b) Increase in the initial grain size
(c) Increase in the temperature of cold working
(d) The presence of impurity
Electrical Engineering
1. In a thyrister full converter feeding a continuous load current, what is the duration each thyrister conducts
in a cycle?
(a) 60 0 (b) 90 0
(c) 120 0 (d) 180 0
2. In a three-phase induction motor, the rotor field runs at the following speed with Respect to the stator
structure:
(a) At synchronous speed in the direction of stator field
(b) At a slip speed in the direction of stator speed
(c) At synchronous speed in a direction opposite to that of stator field
(d) At zero speed
Electronics
1. In the hybrid parameter model of a transistor reverse transfer voltage ratio and forward transfer current
ratio are respectively given by:
(a) h11 and h21 (b) h12 and h11
(c) h21 and h11 (d) None of these
2. A Signal x(t) has the Fourier transform
X(?) = { 1 for | ? | < }W . Its first zero-crossing in time domain occurs at:
Otherwise
(a) 1/pW (b) W
( c) p/ W (d) None of these
Computer Science
1. Magnetic tapes are suitable to applications:
(a) When only a few records are to be accessed
(b) When most of the records are to be accessed
(c) Only when all the records are to be processed
(d) None of the above
2. A system in which 2 or more cpu’s are interconnnected and share a common
Main memory is called:
(a) Pipeline machine
(b) Multifunctional system
(c) Multiprocess
(d) None of these
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