electrical engineering MCQs – Page 21

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 Review each marked answer and report any item that may be outdated or unclear.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

401. In a series circuit with unequal resistances______________?
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A. the lowest resistance has the highest voltage drop

B. the highest resistance has the highest voltage drop

C. the highest resistance has the most of the current through it

D. the lowest resistance has the highest current

402. The value of flux involved m the e.m.f. equation of a transformer is____________?
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A. instantaneous value

B. average value

C. r.m.s. value

D. maximum value

403. Sumpners test is conducted on transformers to determine_____________?
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A. stray losses

B. temperature

C. all-day efficiency

D. none of the above

404. Which of the following statement is true________________?
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A. A galvanometer with low resistance in series is an ammeter

B. A galvanometer with low resistance in parallel is a voltmeter

C. A galvanometer with high resistance in parallel is a voltmeter

D. A galvanometer with high resistance in series is an ammeter

405. When electric current passes through a metallic conductor, its temperature rises. This is due to__________?
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A. the release of conduction electrons from parent atoms

B. mutual collisions between metal atoms

C. mutual collisions between conducting electrons

D. collisions between conduction electrons and atoms

406. A common method of cooling a power transformer is_______________?
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A. air blast cooling

B. natural air cooling

C. any of the above

D. oil cooling

407. All of the following are equivalent to watt except_____________?
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A. amperes x volts

B. amperes/volt

C. (amperes) ohm

D. joules/seC.

408. Voltage dependent resistors are used_____________?
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A. as heating elements

B. for inductive circuits

C. as current stabilizers

D. to supress surges

409. In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes__________________?
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A. Positive

B. None of these

C. Negative

D. Zero

410. The chemical used in breather for transformer should have the quality of____________?
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A. cooling the transformer oil

B. absorbing moisture

C. cleansing the transformer oil

D. ionizing air

411. Ohms law is not applicable to____________?
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A. high voltage circuits

B. vacuum tubes

C. carbon resistors

D. circuits with low current densities

412. The purpose of providing an iron core in a transformer is to_____________?
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A. reduce eddy current losses

B. decrease the reluctance of the magnetic path

C. provide support to windings

D. reduce hysteresis loss

413. The advantage of using free wheeling diode in half controlled bridge converter is that
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A. There is always a path for the dc current dependent of the ac line

B. There is always a path for the dc current independent of the ac line

C. There is always a path for the ac current independent of the ac line

D. There is always a path for the ac current independent of the ac line

414. Which winding of the transformer has less cross-sectional area?
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A. Primary winding

B. High voltage winding

C. Low voltage winding

D. Secondary winding

415. An ideal transformer is one which has_____________?
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A. none of the above

B. core of stainless steel and winding of pure copper metal

C. no losses and magnetic leakage

D. a common core for its primary and secondary windings

E. interleaved primary and secondary windings

416. The ability of an electronic system to function properly in its intended electromagnetic environment and should not be a source of pollution to that electromagnetic environment is known as____________?
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A. Electromagnetic compatibility

B. Emission

C. Interference

D. Susceptibility

417. Which method can be used for absolute measurement of resistances _______________?
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A. Releigh method

B. Lorentz method

C. Wheatstone bridge method

D. Ohms law method

418. Conductance is reciprocal of____________?
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A. capacitance

B. resistance

C. inductance

D. reluctance

419. The function of conservator in a transformer is___________________?
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A. to cool the transformer oil

B. to project againstinternal fault

C. to reduce copper as well as core losses

D. to take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings

420. Which of the following statement is true both for a series and a parallel D. C. circuit?
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A. Currents are additive

B. Elements have individual currents

C. Power are additive

D. Voltages are additive

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