electrical engineering MCQs – Page 4

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 Review each marked answer and report any item that may be outdated or unclear.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
61. IGBT combines the advantages of_____________?
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A. None of these

B. SITs and MOSFETs

C. BJTs and MOSFETs

D. BJTs and SITs

62. In a full wave rectifier, the rectification ratio is approximately equal to____________?
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A. 81%

B. 91%

C. 71%

D. 61%

63. The carrier which are commonly used in constant frequency PWM is______________?
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A. Triangle carrier

B. All of these

C. Inverted sawtooth carrier

D. Sawtooth carrier

64. For power output higher than 15 kW, the suitable rectifier is________________?
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A. Single phase

B. Only (b) and (c)

C. Poly phase

D. 3 phase

65. Which triggering is the most reliable____________?
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A. Gate triggering

B. Thermal triggering

C. Forward voltage triggering

D. dV / dt triggering

66. A single phase full bridge inverter can operate in load commutation mode in case load consists of____________?
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A. RLC underdamped.

B. RLC critically damped.

C. RL.

D. RLC overdamped.

67. The power MOSFET device is a___________?
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A. Voltage controlled bipolar device

B. Voltage controlled unipolar device

C. Current controlled unipolar device

D. Current controlled bipolar device

68. CB used for over current protection of thyristor operates when the fault current is__________?
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A. of long period

B. of short duration

C. both (A) and (B)

D. neither (A) nor (B)

69. Snubber circuit is used with SCR_________________?
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A. in parallel

B. either series or parallel

C. anti parallel

D. in series

70. If P is the power of a star connected system then what will be power of an equivalent delta connected system?
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A. 3P

B. None of the above

C. P

D. P/3

71. The power demand can be estimated approximately by___________?
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A. Statistical method

B. Economic parameters

C. Mathematical method

D. Load survey method

72. Which of the following quantities consists of SI unit as WATT ?
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A. Force

B. Charge

C. Current

D. Power
73. A thyristor can termed as__________?
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A. AC switch

B. DC switch

C. Both a and B

D. Square wave switch

74. After proper turn on of thyristor____________?
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A. gate signal is always present

B. gate signal should present but can be removed

C. none of the above.

D. gate signal must be removed
75. A capacitive load in voltage source inverters generates ________________?
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A. Small current spikes and can be reduced by using an inductive filter

B. Small current spikes and can be increased by using an inductive filter

C. Large current spikes and can be reduced by using an inductive filter

D. Large current spikes and can be increased by using an inductive filter

76. To meet high current demand we use SCRs in______________?
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A. series connection.

B. parallel connection.

C. anti parallel connection.

D. both B and C.

77. A power MOSFET has three terminals called___________?
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A. Collector, emitter and base

B. Drain, source and gate

C. Drain, source and base

D. Collector, emitter and gate

78. Any electrical signal present in a circuit other than the desired signal is known as______________?
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A. Interference

B. Distortion

C. All of these

D. Noise
79. 60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is______________________?
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A. 83.30%

B. 76.3 %

C. 90.90%

D. 91.60%

80. Under over voltage condition impedance offered by the voltage clamping device is__________?
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A. moderate

B. High

C. low

D. infinity