electrical engineering MCQs – Page 264

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 Review each marked answer and report any item that may be outdated or unclear.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
5261. Which of the following generator will have negligible terminal voltage while running on no-load?
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A. Compound generator

B. Shunt generator

C. Series generator

D. Separately excited generator

5262. Iron losses in a D.C. machine are independent of variations in______________?
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A. load

B. speed and voltage

C. voltage

D. speed

5263. Number of tappings for each equalizer ring is equal to_____________?
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A. number of poles

B. number of parallel paths

C. number of commutator segments

D. number of pole pairs
5264. Iron losses in a D.C. machine are independent of variations in_____________?
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A. speed

B. voltage

C. load

D. speed and voltage

5265. A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will_____________?
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A. will be of 5 xiVHz

B. will be of 5 Hz

C. will be of v Hz 5

D. will be zero

5266. In a commutator_____________?
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A. mica and copper are equally hard

B. mica is harder than copper

C. none of the above

D. copper is harder than mica

5267. A cumulatively compounded long shunt generator when operating as a motor would be____________?
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A. cumulatively compounded short shunt

B. cumulatively compounded long shunt

C. differentially compounded short shunt

D. deferentially compounded long shunt
5268. According to Flemings right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of____________?
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A. lines of force

B. either of the above

C. none of the above

D. motion of conductor

5269. A D.C. generator works on the principle of____________?
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A. Faradays law of electromagnetic induction

B. Lenzs law

C. none of the above

D. Ohms law

5270. In over compounded generator, full load terminal voltage is______________?
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A. less than no load terminal voltage

B. equal to no-load terminal voltage

C. almost zero

D. more than no load terminal voltage
5271. In the depletion region of a pn junction, there is a shortage of_________________?
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A. Donor ions

B. None of the above

C. Acceptor ions

D. Holes and electrons
5272. A semiconductor has ______________ temperature coefficient of resistance?
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A. Zero

B. None of the above

C. Negative

D. Positive

5273. The resistivity of a pure silicon is about _______________?
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A. 6000 O cm

B. 6 x 10-8 O cm

C. 100 O cm

D. 3 x 105 O m

5274. A reverse bias pn junction has_____________?
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A. Very narrow depletion layer

B. Almost no current

C. Large current flow

D. Very low resistance

5275. The resistivity of pure germanium under standard conditions is about_______________?
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A. 6 x 10-4 cm

B. 60 x cm

C. 6 x 104 cm

D. 3 x 106 cm

5276. The leakage current in a pn junction is of the order of________________?
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A. kA

B. mA

C. Aa

D. A
5277. The leakage current across a pn junction is due to________________?
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A. Minority carriers

B. Junction capacitance

C. Majority carriers

D. None of the above

5278. A hole and electron in close proximity would tend to________________?
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A. None of the above

B. Repel each other

C. Attract each other

D. Have no effect on each other

5279. The random motion of holes and free electrons due to thermal agitation is called______________?
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A. Diffusion

B. None of the above

C. Pressure

D. Ionisation

5280. Addition of pentavalent impurity to a semiconductor creates many________________?
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A. Bound electrons

B. Valence electrons

C. Free electrons

D. Holes