electrical engineering MCQs – Page 223

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 Review each marked answer and report any item that may be outdated or unclear.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

4441. A certain regulator has a no-load voltage of 6 V and a full-load output of 5.82 V. What is the load regulation ?
0

A. 09%

B. None of the above

C. 87%

D. 72%

4442. Zener diode are generally made of _____________?
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A. Germanium

B. None of the above

C. Carbon

D. Silicon

4443. If the load current drawn by unregulated power supply increases, the d.c. output voltage______________?
0

A. Decreases

B. None of the above

C. Stays the same

D. Increases

4444. A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage ?
0

A. 2 V

B. 6 V

C. 7 V

D. 8 V

4445. An ideal regulated power supply is one which has voltage regulation of________________?
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A. 5%

B. 0%

C. 10%

D. 1%

4446. As the junction temperature increases, the voltage breakdown point for avalanche mechanism______________?
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A. Increases

B. Remains the same

C. None of the above

D. Decrease

4447. The current in a Zener diode is limited by _______________?
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A. External resistance

B. Power dissipation

C. Both (A) and (B)

D. None of the above

4448. If the load resistance decreases in a Zener regulator, then Zener current ______________?
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A. Stays the same

B. None of the above

C. Increases

D. Decreases

4449. The Zener current will be minimum when_____________?
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A. Load current is minimum

B. Load current is maximum

C. Load current is zero

D. None of the above

4450. A 30 V Zener will have depletion layer width_______________ that of 10 V Zener?
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A. Equal to

B. More than

C. None of the above

D. Less than

4451. In a Zener voltage regulator, the changes in load current produce changes in _________________?
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A. Zener voltage as well as Zener current

B. Zener voltage

C. None of the above

D. Zener current

4452. A Zener diode utilises_____________characteristic for voltage regulation?
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A. Forward

B. Reverse

C. Both forward and reverse

D. None of the above

4453. In an unregulated power supply, if load current increases, the output voltage _____________?
0

A. Increases

B. None of the above

C. Decreases

D. Remains the same

4454. In a 15 V Zener diode , the breakdown mechanism will occur by ______________?
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A. Avalanche mechanism

B. Zener mechanism

C. Both Zener and avalanche mechanism

D. None of the above

4455. If the input a.c. voltage to regulated or ordinary power supply increases by 5% what will be the approximate change in d.c. output voltage?
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A. 5%

B. 20%

C. 10%

D. 15%

4456. The load voltage is approximately constant when a Zener diode is ________________?
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A. Unbiased

B. Operating in the breakdown region

C. Reverse biased

D. Forward biased

4457. A Zener voltage regulator will cease to act as a voltage regulator if Zener current becomes______________?
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A. None of the above

B. More than load current

C. Zero

D. Less than load current

A. 30 V

B. 45 V

C. 15 V

D. 5 V

4459. A Zener diode______________?
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A. Is a battery

B. Acts like a battery in the breakdown region

C. Is forward biased

D. Has a barrier potential of 1 V

4460. A Zener diode that has very narrow depletion layer will breakdown by____________ mechanism?
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A. Avalanche

B. Zener

C. Both avalanche and Zener

D. None of the above

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