electrical engineering MCQs – Page 22

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 Review each marked answer and report any item that may be outdated or unclear.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

421. Which of the following does not change in a transformer ?
0

A. All of the above

B. Frequency

C. Voltage

D. Current

422. DIAC and TRIAC both are semiconductors devices and conduct in____________________?
0

A. DIAC conducts in forward direction and TRIAC conducts in reverse direction

B. Both conducts in forward direction

C. Both conducts in reverse direction

D. Both conducts in either direction

423. An ideal transformer has infinite values of primary and secondary inductances. The statement is______________?
0

A. TRUE

B. false

424. While conducting short-circuit test on a transformer the following side is short circuited?
0

A. Secondary side

B. Low voltage side

C. Primary side

D. High voltage side

425. International ohm is defined in terms of the resistance of________________?
0

A. the unit length of wire

B. a cube of copper

C. a column of mercury

D. a cube of carbon

426. The transformer laminations are insulated from each other by____________?
0

A. any of the above

B. thin coat of varnish

C. paper

D. mica strip

427. Which of the following quantities remain the same in all parts of a series circuit ____________?
0

A. Resistance

B. Current

C. Power

D. Voltage

428. TRIAC is a semiconductor power electronic device which contains____________?
0

A. Two SCRs connected in reverse parallel

B. Two SCRs connected in parallel

C. Two SCRs connected in series

D. Two BJTs connected in series

429. Nichrome wire is an alloy of_____________?
0

A. lead and zinc

B. chromium and vanadium

C. copper and silver

D. nickel and chromium

430. Temperature co-efficient of resistance is expressed in terms of___________?
0

A. ohms/C

B. ohms/ohmC

C. mhos/C

D. mhos/ohmC

431. Distribution transformers are generally designed for maximum efficiency around________________?
0

A. 90% load

B. 50% load

C. 25% load

D. zero load

432. For testing appliances, the wattage of test lamp should be_____________?
0

A. high

B. low

C. any value

D. very low

433. Which one of the following does not have negative temperature co-efficient ____________?
0

A. Aluminium

B. Rubber

C. Mica

D. Paper

434. The efficiency of a transformer will be maximum when_____________?
0

A. eddy current losses = copper losses

B. copper losses = iron losses

C. hysteresis losses = eddy current losses

D. copper losses = hysteresis losses

435. Out of the following which is an insulating material____________?
0

A. Copper

B. Paper

C. Silver

D. Gold

436. For commutation in three phase PAC, normally balanced three phase voltages VR, VY and VB are connected to the three legs of the converter via______________?
0

A. Three capacitances

B. Three transistors

C. Three resistance

D. Three inductances

437. The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?
0

A. Buchholz relay

B. Bushings

C. Breather

D. Conservator

438. When current flows through heater coil it glows but supply wiring does not glow because______________?
0

A. supply wiring is covered with insulation layer

B. supply wires are made of superior material

C. resistance of heater coil is more than the supply wires

D. current through supply line flows at slower speed

439. At low value of power factor, the cost of generation of a power station will be____________?
0

A. none of the above

B. high

C. low

D. remain same

440. jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?
0

A. 6.6 kV (r.m.s. value)/cm

B. 11 kV (r.m.s. value)/cm

C. 30 kV (maximum value)/cm

D. 22 kV (maximum value)/cm

Previous Next

Showing 421 to 440 of 7381 mcqs