electrical engineering MCQs – Page 272

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 Review each marked answer and report any item that may be outdated or unclear.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 generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
5421. If the doping level of a crystal diode is increased, the breakdown voltage__________________?
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A. remains the same

B. none of the above

C. is decreased

D. is increased

5422. Mains a.c. power is converrted into d.c. power for_________________?
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A. using in electronic equipment

B. lighting purposes

C. heaters

D. none of the above

5423. A zener diode is destroyed if it______________?
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A. carrier more than rated current

B. is forward biased

C. is reverse biased

D. none of the above

5424. A crystal diode has forward resistance of the order of ________________?
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A. ?

B. none of the above

C. k?

D. M?

5425. The ripple factor of a half-wave rectifier is_________________?
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A. 2.5

B. 2

C. 0.48

D. 1.21

5426. A crystal diode is used as______________?
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A. a voltage regulator

B. an oscillator

C. a rectifier

D. an amplifier

5427. If the temperature of a crystal diode increases, then leakage current ______________?
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A. becomes zero

B. increases

C. decreases

D. remains the same

5428. A half-wave rectifier has an input voltage of 240 V r.m.s. If the step-down transformer has a turns ratio of 8:1, what is the peak load voltage? Ignore diode drop?
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A. 42.5 V

B. 30 V

C. 86.5 V

D. 27.5 V

5429. The most widely used rectifier is ________________?
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A. bridge full-wave rectifier

B. none of the above

C. centre-tap full-wave rectifier

D. half-wave rectifier

5430. When a crystal diode is used as a rectifier, the most important consideration is ____________?
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A. reverse characteristic

B. PIC rating

C. doping level

D. forward characteristic

5431. The leakage current in a crystal diode is due to _________________?
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A. minority carriers

B. none of the above

C. junction capacitance

D. majority carriers

5432. A zener diode utilizes ______________ characteristics for its operation?
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A. forward

B. reverse

C. both forward and reverse

D. none of the above

5433. The PIV rating of each diode in a bridge rectifier is ___________that of the equivalent center-tap rectifier?
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A. twice

B. the same as

C. one-half

D. four times

5434. For the same secondary voltage, the output voltage from a centre-tap rectifier is___________ than that of bridge rectifier?
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A. four time

B. twice

C. thrice

D. one-half
5435. In the breakdown region, a zener didoe behaves like a _______________source?
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A. none of the above

B. constant current

C. constant voltage

D. constant resistance

5436. A crystal diode is a ________________device?
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A. none of the above

B. non-linear

C. bilateral

D. linear

5437. The knee voltage of a crystal diode is approximately equal to ________________?
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A. breakdown voltage

B. barrier potential

C. applied voltage

D. forward voltage

5438. If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is _____________biased?
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A. none of the above

B. reverse

C. forward

D. either forward or reverse

5439. A crystal diode utilises .. characteristic for rectification
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A. reverse

B. forward or reverse

C. none of the above

D. forward
5440. A zener diode is used as ______________?
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A. a rectifier

B. a multivibrator

C. a voltage regulator

D. an amplifier