electrical engineering MCQs – Page 117

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 Review each marked answer and report any item that may be outdated or unclear.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
2321. A crystal diode has______________?
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A. three pn junctions

B. one pn junction

C. none of the above

D. two pn junctions

2322. Due to which of the following reasons it is desirable to have short arc length ?
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A. All of the above

B. To have better stirring action

C. To increase the life of roof refractory

D. To achieve better heating

E. To reduce problem of oxidation

2323. In resistance heating highest working temperature is obtained from heating elements made of_____________?
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A. silver

B. nichrome

C. nickel copper

D. silicon carbide
2324. In electric press, mica is used because it is _________ conductor of heat but/and __________ conductor of electricity?
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A. good, good

B. bad, bad

C. good, bad

D. bad, good

2325. When current feedback (negative) is applied to an amplifier, its input impedance _____________?
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A. Is increased

B. Remains the same

C. None of the above

D. Is decreased
2326. The emitter of a transistor is___________doped?
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A. lightly

B. heavily

C. none of the above

D. moderately

2327. In CE arrangement, the value of input impedance is approximately equal to ______________?
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A. Hre

B. None of the above

C. Hoe

D. Hie
2328. In order to determine hfe and hie parameters of a transistor, __________ is an a.c. short-circuited?
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A. Output

B. None of the above

C. Input as well as output

D. Input

2329. A perfect black body is one that_____________?
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A. absorbs, reflects and transmits all incident radiations

B. transmits all incident radiations

C. absorbs all incident radiations

D. reflects all incident radiations

2330. The reverse current in a diode is of the order of _____________?
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A. ?A

B. mA

C. A

D. kA

2331. The phase difference between the input and output voltages of a transistor connected in common collector arrangement is_____________?
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A. 2700

B. 1800

C. 00

D. 900

2332. A 741-Type OP-AMP has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of______________?
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A. 50KHz

B. 1000/7.07KHz

C. 100KHz

D. 1000/17KHz

2333. In a npn transistor,_____________are the minority carriers?
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A. donor ions

B. holes

C. acceptor ions

D. free electrons

2334. If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is _____________biased?
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A. either forward or reverse

B. none of the above

C. forward

D. reverse

2335. In induction heating ___________ is abnormally high?
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A. voltage

B. frequency

C. phase angle

D. current

2336. In a resistance furnace the atmosphere is_____________?
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A. neutral

B. oxidizing

C. reducing

D. deoxidising

2337. 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. 86.5 V

B. 30 V

C. 27.5 V

D. 42.5 V
2338. Direct arc furnaces have which of the following power factors ?
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A. Low, leading

B. Unity

C. Any of the above

D. Low, lagging
2339. The power gain in a transistor connected in___________arrangement is the highest?
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A. common collector

B. common emitter

C. common base

D. none of the above

2340. Which of the following is an advantage of heating by electricity ?
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A. All of the above

B. Quicker operation

C. Higher efficiency

D. Absence of flue gases