BARC PLACEMENT PAPER 2011

1. Distinction between FM and PM at high frequencies.

2. Which of these has the least propagation delay RTL/ECL/I2L/CMOS.

3. Switching speed of CMOS is affected/unaffected by changes in supply voltage.

4. Which of these provides a measure of heart rate P/QRS complex/T/none of these.

5. Given a ckt of a logarithmic amplifier you had to identify what ckt was it.

6. JFET can operate in depletion/enhancement/both/none of the above modes.

7. When a BJT operates in saturation the junctions are fwd biased/reverse biased/…

8. BIBO stability criterion implies that poles are within/outside/on the unit circle.

9. For faithful amplification of low amplitude signals the cut-off/active/saturation regions of a transistor is used.

10. Lissajous pattern of a signal rotates 36 times per minute. if the oscillator frequency is 560 kHz then the unknown freq is…

11. % resolution of a 10 bit ADC.

12. To obtain 10 mV resolution on 5 V range how many bit DAC is to be used..

13. Why is LCD preferred to LED.

14. How will 0.6973 be displayed on 10 V range of a 4 ½ digit multimeter.

15. Which of the following cannot be used for an automatic feedback temp ctrl system thermocouple/thermometer/thermistor/IC sensor.

16. Y(n)=X(-n+3) is an example of a linear/non linear and shift variant/invariant system.

17. The falling body method is used to determine viscosity/humidity/….

18. Which of these methods of viscosity measurement gives greatest accuracy falling body method/rotating cylinder method/both/…

19. Some question on gas chromatography

20. A device having a rotor with 3 Y-connected coils and a stator is likely to be a synchro/RVDT/control transformer/…

21. In a twisted ring counter the initial count is 1000. after the 4th clock pulse its state will be….

22. A 240 kHz signal is given into a 3 bit binary ripple counter. The lowest o/p freq obtainable is….

23. For parity bit checking which of the following gates can be used XOR/NAND/OR/XNOR.

24. Why is a BJT called so..

25. Identify the expression for gauge factor of a strain gauge among the given options.

26. In a semiconductor strain gauge as tensile strain is applied what changes take place in the n and p areas..

27. How does a radioactive level gauging system work…

28. A capacitive transducer measuring level works on the principle of change in distance between plates/change in dielectric strength/…

29. 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.

30. Find the transfer function from a block diagram.

31. Synchronous ctrs are preferred to asynchronous ctrs bcoz they are faster/glitches at the output can be avoided/both/none of these.

32. 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….

33. IE=IC for a transistor in saturation/cutoff/active/both saturation and active regions.

34. Reproducibility of measurements is called accuracy/precision/linearity/none of these.

35. Which of these is not strictly a static characteristic accuracy/precision/tolerance/linearity.

36. The shunt coil in a Q meter has resistance of the order of mO/O/kO/..

37. For measuring inductance of high Q coils the bridge used is Maxwell-wien/Schering/…

38. Which of these measures inductance in terms of capacitance Maxwell and hay/Maxwell and Schering/hay and Schering/…

39. 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/….

40.. Which of these values of ? gives damped oscillations: 0/1/1.6/0.6

41. 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..

42. Fourier transform of cos(?0t) is…

43. At t=0 the step response of a 1st order system is….

44. 555 can be used as a monostable/astable/freq dividing ckt/all of these.

45. In a PT when the secondary is open ckted with the primary excited what will happen.

46. If a system is marginally stable then the nature of oscillations will be…

47. Linear encoders mostly use straight binary/BCD/gray code.

48. For an accelerometer working in displacement mode the ratio of forcing freq to natural freq should be…..

49. According to Eulers theory crippling or buckling load is ____ (Wcr = Cp2EI/l2)

50. During sensible heating, specific humidity_? (remains constant)