electrical engineering MCQs – Page 250

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 Review each marked answer and report any item that may be outdated or unclear.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

4981. The path of a magnetic flux in a transformer should have______________?
0

A. high reluctance

B. low resistance

C. high resistance

D. low reluctance

4982. The full-load copper loss of a transformer is 1600 W. At half-load, the copper loss will be___________?
0

A. 1600 W

B. 800 W

C. 6400 W

D. 400 W

4983. Iron loss of a transformer can be measured by____________?
0

A. any type of wattmeter

B. frequency meter

C. low power factor wattmeter

D. unity power factor wattmeter

4984. Which winding of the transformer has less cross-sectional area?
0

A. Low voltage winding

B. Primary winding

C. Secondary winding

D. High voltage winding

4985. Which of the following property is not necessarily desirable in the material for transformer core ?
0

A. Low hysteresis loss

B. Mechanical strength

C. High permeability

D. High thermal conductivity

4986. The magnetising current of a transformer is usually small because it has___________?
0

A. laminated silicon steel core

B. small air gap

C. large leakage flux

D. fewer rotating parts

4987. In a transformer the resistance between its primary and secondary should be_____________?
0

A. 1000 Q

B. infinity

C. zero

D. 10 Q

4988. Harmonics in transformer result in___________?
0

A. increased I2R losses

B. increased core losses

C. all of the above

D. magnetic interference with communication circuits

4989. Which of the following parts of a transformer is visible from outside ?
0

A. Primary winding

B. Bushings

C. Core

D. Secondary winding

4990. In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of_________________?
0

A. more than 15 A

B. none of the above

C. less than 15 A

D. 15 A

4991. Losses which occur in rotating electric machines and do not occur in transformers are___________?
0

A. hysteresis and eddy current losses

B. friction and windage losses

C. copper losses

D. magnetic losses

4992. The power transformer is a constant______________?
0

A. voltage device

B. power device

C. main flux device

D. current device

4993. Natural oil cooling is used for transformers up to a rating of____________?
0

A. 1000 kVA

B. 250 kVA

C. 3000 kVA

D. 500 kVA

4994. A good voltage regulation of a transformer means________________?
0

A. output voltage fluctuation from no load to full load is least

B. ood voltage regulation of a transformer means

C. difference between primary and secondary voltage is maximum

D. output voltage fluctuation with power factor is least

E. difference between primary and secondary voltage is least

4995. The function of conservator in a transformer is___________________?
0

A. to cool the transformer oil

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

C. to project againstinternal fault

D. to reduce copper as well as core losses

4996. Power transformers are generally designed to have maximum efficiency around__________?
0

A. half-load

B. 10% overload

C. near full-load

D. no-load

4997. In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are______________?
0

A. none of the above

B. copper losses

C. hysteresis and eddy current losses

D. friction and windage losses

4998. In a power or distribution transformer about 10 per cent end turns are heavily insulated__________?
0

A. to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns

B. none of the above

C. to reflect the line surge and save the winding of a transformer from damage

D. to absorb the line surge voltage and save the winding of transformer from damage

4999. During open circuit test of a transformer:
0

A. primary is supplied rated kVA

B. primary is supplied rated voltage

C. primary is supplied current at reduced voltage

D. primary is supplied full-load current

5000. The path of the magnetic flux in transformer should have____________?
0

A. high reluctance

B. high resistance

C. low reactance

D. low resistance

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