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HAL Placement Paper March 2011:-

1. Effect of line commutated inductance in inverter

a) increase current ripple
b) reduces current ripple
c) increases output voltage
d) reduces output voltage

2. The type of bridge is used for Low Q applications

ans: maxwells bridge

3. A question on PSM and TSM in power system

4. The advantage of PI controller over P controller

5. The power gain is highest in wat amplifier

Ans : common emitter

6. Power of a converter with ac input supply and dc output current


7. The element which has unchanged properties when current direction is reversed

Ans: b

8. The output voltage is high in wat rectifier

a) HWR
b) FWR

9. Which coupling gives the higher gain in case of amplifier: -

a) Capacitor coupling     b) Impedance coupling     c) Transformer coupling

10. Which distortion is least objectionable in audio amplification: -

a) Phase     b) Frequency     c) Harmonic     d) Intermediation

11. A narrowband amplifier has a band pass nearly…………of central frequency:-

a) 33.3%     b) 10%     c) 50%

12. Frequency of wein bridge oscillator

13. Phase shift oscillator consists: -

a) RL     b) RC     c) RLC

14. Crystal oscillator frequency is very stable due to:-

15. Multivibrater Produces: -

a) Sine wave     b) Square wave     c) Smooth wave     d) sawtooth

16. Convert the 101101 Binary number into octal no: -

a) 65     b) 55     c) 51     d) 45

17. 10 in BCD: -

a) 10100     b) 1100     c) 010111     d) None of these

18. Which PNP device has a terminal for synchronizing purpose:-

a) SCS     b) Triac     c) Diac     d) SUS

19. In 3-Phase full converter, the output during overlap is equal to……………..

20. Addition of indium in semiconductor crystal makes: -

a) PNP     b) NPN

21. Free electron exists in which band: -

a) 1     b) 2     c) 3     d) Conduction band

22. Ripple factor of half wave rectifier: -

a) 1.21     b) 0.48     c) 0.5

23. The input and output impedance of an ideal opamp

24. The type of converter used in HVDC

25. The relationship b/w the airgap and current in light

26. Corrona loss is less in which type of shaped conductor?( the question is asked 2 times)

Ans: circular

27.The motor used in low speed applications?

28. If the accuracy of an instrument is 5% for 100A current ,accuracy for 50A current?

29. A question on time constant of a coil(R-L) circuit!

30. Efficiency of half wave rectifier: -

31. Finding the power angel in power system

32. The motor used in fruit juicer

33. LVDT is used in finding th displacement

34. Cross magnetization will come with wat pf

35. When the temperature of the room increased then the energy of semiconductor…

36. Power diode is generally made from: - Silicon/Germanium/Both/None of these

37. Thermionic Emission of electron is due to………….

38. When the both junction of NPN diode is reverse biased, then the diode is in which mode: -

a) Active     b) Cutoff     c) Saturation     d) inverted

39. Which transistor mode gives the inverted output: -

a) Common Emitter     b) Common Base     c) Common Collector     d) None of these

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