Electronics Corporation of India Limited (ECIL)
Memory based Question paper
For Electrical Engineering
Note: If Answer contains * means Answer is may be correct but not sure,
1. Transformer core are laminated for what purpose?
a)Reduce copper losses
b)Reduce iron losses
c)Reduce eddy current losses
d)Reduce hysteresis losses
Ans: Reduce eddy current losses
2.240V 1-phase 50Hz 10A, 0.8 pf lag energy meter, Revolution/kwh=400 then find speed of the disk in rpm
a)12.8
b)21.1
c)18.1
d)19.2
Ans:12.8
3.1-phase AC supply is given to the ___________in he single phase induction motor
a)Stator
b)Rotor
c)Both
d)None
Ans:Stator
4.Synchronous motor operated at leading pf when
a)Under exited
b)Over exited
c)Normal exited
d)None
Ans:Over exited
5.CMRR=100 dB, Differential mode gain=10 power 4 then find Common mode gain
a)10
b)0.1
c)1
d)10 power 5
Ans:0.1
6.3-phase, 50 Hz 6 pole synchronous motor rotate at
a)1000 rmp
b)1500 rpm
c)1800 rpm
d)3600 rpm
Ans:1000 rpm
7.Nr=727.5 rpm for 3-phase 50 Hz 8 pole induction motor find rotor frequency
a)1.5 Hz
b)50 Hz
c)75 Hz
d)60 Hz
Ans:1.5 Hz
8.3-phase rectifier ripple frequency is_________ if supply frequency is 50 Hz
a)50 Hz
b)100 Hz
c)150 Hz
d)300 Hz
Ans:300 Hz
9.18/9+8-2*5=________ in C
a)0
b)9
c)5
d)7
Ans:0
10.find K G(s)=K/s(s power 2+s+2)(s+3)
a)
b)
c)
d)
Ans:
11.Find critically damped system
a)1/(S power2+2S+4)
b) 1/(S power2+4S+4)
c) 1/(S power2-2S+4)
d) 1/(S power2-4S+4)
Ans: 1/(S power2+4S+4)
12.C is capacitance of A=10cm*10cm then find C for A=2.5cm*2.5cm
a)C/4
b)C/8
c)C/16
d)C/32
Ans:C/16
13.Ammeter carries 1mA current with internal resistance of 1 Kohm, this meter is used for 10V measurement how much resistance is adding in series to the circuit
a)10kohm
b)9Kohm
c)0.9Kohm
d)1Kohm
Ans:9Kohm
14.Damping torque used in energy meter is
a)Electro static
b)Electro magnetic
c)eddy current
d)None
Ans:eddy current
15.For DC shunt machine applied voltage is half then speed of machine will be
a)Increses and double
b)Decreases and half
c)Decreases lightly
d)No change
Ans: Decreases lightly
16.Y=ABCD+A’BCD+AB’CD+A’B’CD
a)A+B
b)CD
c)C+D
d)AB
Ans:CD
17.Wait status can be achieved in 8085 micro processor by]
a)TRAP
b)DMA
c)HOLD
d)INTR
Ans:HOLD
18.DMA can do
a)Data transfer between memory and I/O devices with out use of processor
b)
c)
d)
Ans: Data transfer between memory and I/O devices with out use of processor
19.Resolution =0.001V for 10V measurement how many bits we need in Analog to digital converters
a)4
b)8
c)16
d)14
Ans:16
20.X-plate 20sin(wt), Y-plate 20sin(wt+a) what value of ‘a’ lissajous pattern is circle
a)0 deg
b)90 deg
c)180 deg
d)360 deg
Ans:90 deg
21.High frequency transformer core is made up of
a)Copper
b)Csat steel
c)Graphite
d)Ferrite
Ans:Ferrite
22.In permanent magnet motor Voltage is
a)Praportional to Speed
b)Praportional to Current
c)
d)
Ans:
23.C is capacitance, L is inductance then Sqr root of(L/C) is
a)Resistance
b)Power factor
c)Voltage drop
d)Reactance
Ans:Resistance
24.For type-2 servo motor can be exited by ramp input then study state error is
a)0
b)1
c)infinity
d)None
Ans:0
25.1/(1+RCS) is exited by step function then
a)Ve(t/RC)
b)Ve(-t/RC)
c)V(1+e(-t/RC))
d)V(1-e(-t/RC))
Ans: Ve(-t/RC)
26. Gain is 10 power 5 and one pole at 100 Hz then band width is
a)1000
b)100
c)100000
d)1
Ans:
27.In CC configuration of amplifier has
a)High input Impedance and low output impedance
b)Low input Impedance and High output impedance
c)Low input Impedance and low output impedance
d)High input Impedance and High output impedance
Ans: High input Impedance and low output impedance
28.load of 100 ohm and step down transformer of 2:1 if load is reflected to primary is
a)100 ohm
b)50 ohm
c)400 ohm
d)500 ohm
Ans:400 ohm
29.20:1 gear box output is 200W then input is
a)10W
b)200W
c)4KW
d)
Ans::
No comments:
Post a Comment