electrical engineering MCQs – Page 239

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs

1. economics of power generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

4761. ON state voltage drop across SCR lie between the range_____________?
0

A. 1 1.5 V.

B. 0.5 1 V.

C. 1.5 2 V.

D. 0 0.5 V.

4762. In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes__________________?
0

A. Zero

B. Negative

C. Positive

D. None of these

4763. Snubber circuit is used with SCR_________________?
0

A. either series or parallel

B. in series

C. in parallel

D. anti parallel

4764. For swept frequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length of the transmission line would
0

A. Increase with frequency

B. Decrease with frequency

C. Either A. or B.

D. Remains same with change in frequency

4765. In BJT, switching losses occurs___________?
0

A. Only at turn on

B. Only at turn off

C. Both at turn on and off

D. None of these

4766. Silicon controlled rectifier can be turned on____________?
0

A. By applying a gate pulse and turned off only when current becomes zero

B. By making current non zero and turned off by making current zero

C. And turned off by applying gate pulse

D. By applying a gate pulse and turned off by removing the gate pulse

4767. If a shunt motor is started with its field winding open then___________?
0

A. None of these

B. It will rotate at dangerously high speed

C. It will rotate at less speed as that with its field winding closed

D. It will rotate at the same speed as that with its field winding closed

4768. Advantages of HVDC transmission over AC system is / are____________?
0

A. Reversal of power can be controlled by firing angle

B. They can link two AC system operating unsynchronized

C. All of these

D. Very good dynamic behavior

4769. Thyristor can be protected from over voltages by using
0

A. 23 mA.

B. 60 mA.

C. 40 mA.

D. 10 mA.

4770. Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then________________?
0

A. Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.

B. Vc1 = Vc2 = Vc3 any value of Ig.

C. Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.

D. Vc1 > Vc2 > Vc3 when Ig1 aYEN Ig2 &Atil

4771. Compared to transistor, _________ have lower on state conduction losses and higher power handling capability?
0

A. MOSFETs

B. Thyristor

C. Semi conductor diodes

D. TRIACs

4772. The power MOSFET device is a___________?
0

A. Current controlled bipolar device

B. Voltage controlled unipolar device

C. Voltage controlled bipolar device

D. Current controlled unipolar device

4773. Choppers is a_______________?
0

A. DC AC converters

B. DC DC converters

C. AC DC converters

D. AC AC converters

4774. During which time maximum conduction spreading take place in the thyristor during turn ON?
0

A. Rise time

B. Delay time

C. Spread time

D. Same for every case

4775. An SCR can be used___________?
0

A. All of these

B. as static conductor

C. for speed control of dc shunt motor

D. for power control

4776. The switching function of semiconductor devices can be characterized with___________?
0

A. Duty ratio only

B. Duty ratio and frequency

C. Frequency only

D. Duty ratio, frequency and time delay

4777. A power MOSFET has three terminals called___________?
0

A. Collector, emitter and gate

B. Drain, source and base

C. Drain, source and gate

D. Collector, emitter and base

4778. The opposite of susceptibility is___________?
0

A. Interference

B. Electromagnetic compatibility

C. Emission

D. Immunity

4779. A capacitive load in voltage source inverters generates ________________?
0

A. Small current spikes and can be increased by using an inductive filter

B. Small current spikes and can be reduced by using an inductive filter

C. Large current spikes and can be increased by using an inductive filter

D. Large current spikes and can be reduced by using an inductive filter

4780. The ac voltage controller can be used for ___________?
0

A. On line transformer tap changing

B. Lighting and heating control

C. All of these

D. Soft starting

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