electrical engineering MCQs – Page 273

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 Review each marked answer and report any item that may be outdated or unclear.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

5441. A series resistance is connected in the zener circuit to_______________?
0

A. none of the above

B. protect the zener

C. properly reverse bias the zener

D. properly forward bias the zener

5442. A 10 V power supply would use ____________ as filter capacitor?
0

A. air capacitor

B. electrolytic capacitor

C. paper capacitor

D. mica capacitor

5443. A zener diode has ________________?
0

A. three pn junctions

B. two pn junctions

C. one pn junction

D. none of the above

5444. If the a.c. input to a half-wave rectifier is an r.m.s value of 400/?2 volts, then diode PIV rating is__________________?
0

A. 400 x ?2 V

B. 400/?2 V

C. 400 V

D. none of the above

5445. When the crystal current diode current is large, the bias is ______________?
0

A. forward

B. reverse

C. inverse

D. poor

5446. ____________ rectifier has the lowest forward resistance?
0

A. vacuum tube

B. none of the above

C. solid state

D. gas tube

5447. If the doping level in a crystal diode is increased, the width of depletion layer_____________?
0

A. in increased

B. is decreased

C. none of the above

D. remains the same

5448. When the graph between current through and voltage across a device is a straight line, the device is referred to as _______________?
0

A. passive

B. nonlinear

C. active

D. linear

5449. The maximum efficiency of a half-wave rectifier is _____________?
0

A. 81.20%

B. 50%

C. 40.6 %

D. 25%

5450. The d.c. resistance of a crystal diode is ______________ its a.c. resistance?
0

A. none of the above

B. the same as

C. more than

D. less than

5451. The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ______________?
0

A. 1000:01:00

B. 40,000 : 1

C. 1:01

D. 100:01:00

5452. A zener diode is always_______________ connected?
0

A. reverse

B. none of the above

C. forward

D. either reverse or forward

5453. _____________ filter circuit results in the best voltage regulation?
0

A. none of the above

B. resistance input

C. capacitor input

D. choke input

5454. A zener diode is________________ device?
0

A. a linear

B. none of the above

C. an amplifying

D. a non-linear

5455. The forward voltage drop across a silicon diode is about _______________?
0

A. 0.7 V

B. 3 V

C. 10 V

D. 2.5 V

5456. There is a need of transformer for__________________?
0

A. centre-tap full-wave rectifier

B. none of the above

C. half-wave rectifier

D. bridge full-wave rectifier

5457. A 1,000 V power supply would use_____________ as a filter capacitor?
0

A. air capacitor

B. paper capacitor

C. electrolytic capacitor

D. mica capacitor

5458. The disadvantage of a half-wave rectifier is that the__________________?
0

A. components are expensive

B. none of the above

C. output is difficult to filter

D. diodes must have a higher power rating

5459. The PIV rating of a crystal diode is _______________ that of equivalent vacuum diode
0

A. none of the above

B. more than

C. lower than

D. the same as

5460. If temperature changes, h parameters of a transistor ________________?
0

A. Do not change

B. None of the above

C. Also change

D. May or may not change

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