electrical engineering MCQs – Page 15

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 Review each marked answer and report any item that may be outdated or unclear.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

281. MOSFET stands for______________?
0

A. Metal oxide semiconductor field effect transistor

B. Metal oxide semiconductor field effect transmitter

C. Metal oxide silicon field effect transistor

D. Molybdenum oxide semiconductor field effect transistor

282. The opposite of susceptibility is___________?
0

A. Electromagnetic compatibility

B. Immunity

C. Emission

D. Interference

283. A transformer transforms__________________?
0

A. current

B. power

C. voltage

D. frequency

284. The use of higher flux density in the transformer design____________?
0

A. reduces iron losses

B. increases part load efficiency

C. reduces weight per kVA

D. reduces copper losses

285. Harmonics in transformer result in___________?
0

A. all of the above

B. increased core losses

C. magnetic interference with communication circuits

D. increased I2R losses

286. The efficiency of a transformer, under heavy loads, is comparatively low because_______________?
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A. copper loss becomes high in proportion to the output

B. iron loss is increased considerably

C. voltage drop both in primary and secondary becomes large

D. secondary output is much less as compared to primary input

287. Two resistors are said to be connected in series when___________?
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A. same current passes in turn through both

B. both carry the same value of current

C. total current equals the sum of branch currents

D. sum of IR drops equals the applied e.m.f.

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

A. 800 W

B. 400 W

C. 1600 W

D. 6400 W

289. An open resistor, when checked with an ohm-meter reads_____________?
0

A. zero

B. low but not zero

C. infinite

D. high but within tolerance

290. Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?
0

A. 50C

B. 150C

C. 80C

D. 100C

291. The thickness of insulation provided on the conductor depends on_____________?
0

A. the magnitude of voltage on the conductor

B. the magnitude of current flowing through it

C. both A. and (b)

D. none of the above

292. A no-load test is performed on a transformer to determine_______________?
0

A. core loss

B. copper loss

C. efficiency

D. magnetising current

E. magnetising current and loss

293. Buchholzs relay gives warning and protection against_________________?
0

A. electrical fault inside the transformer itself

B. electrical fault outside the transformer in outgoing feeder

C. for both outside and inside faults

D. none of the above

294. For which of the following ampere second could be the unit ?
0

A. Power

B. Charge

C. Energy

D. Reluctance

295. To detect an over current fault condition, the most reliable method is to connect a_____________?
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A. Voltage sensor in series with IGBT

B. Current sensor across IGBT

C. Current sensor in series with IGBT

D. Voltage sensor across IGBT

296. The transformer ratings are usually expressed in terms of______________?
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A. kVA

B. kW

C. amperes

D. volts

297. The ratio of mass of proton to that of electron is nearly_____________?
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A. 1840

B. 30

C. 4

D. 1840

298. Greater the secondary leakage flux____________?
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A. less will be the primary terminal voltage

B. none of the above

C. less will be the secondary induced e.m.f.

D. less will be the primary induced e.m.f.

299. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes______________?
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A. 0.8 ohm

B. 0.4 ohm

C. 0.6 ohm

D. 1.0 ohm

300. are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators______________?
0

A. Semi-conductors

B. Varistors

C. Thermistor

D. Variable resistors

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