transmission and distribution MCQs – Page 4

Practise focused transmission and distribution questions with marked answers for exam preparation and subject revision.

transmission and distribution Mcqs
61. There is a greater possibility of occurence of corona during______________?
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A. summer heat

B. none of the above

C. winter

D. dry weather

E. humid weather
62. The power transmitted will be maximum when____________?
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A. receiving end voltage is more

B. reactance is high

C. corona losses are minimum

D. sending end voltage is more

63. 310 km line is considered as_______________?
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A. a medium line

B. a short line

C. any of the above

D. a long line
64. A feeder, in a transmission system, feeds power to________________?
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A. all of the above

B. distributors

C. service mains

D. generating stations

65. Electro-mechanical voltage regulators are generally used in___________?
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A. all of the above

B. generators

C. reactors

D. transformers

66. Which of the following are the constants of the transmission lines ?
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A. All of the above

B. Capacitance

C. Inductance

D. Resistance

67. The voltage regulation in magnetic amplifier type voltage regulator is effected by__________?
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A. varying the reactance

B. electromagnetic induction

C. variable transformer

D. varying the resistance

68. The usual spans with R.C.C. poles are_______________?
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A. 4050 meters

B. 60100 meters

C. 300500 meters

D. 80100 meters
69. The operating voltage of supertension cables is up to_________________?
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A. 3.3 kV

B. 6.6 kV

C. 11 kV

D. 33 kV
70. By which of the following a bus-bar is rated?
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A. Current, voltage, frequency and short time current

B. Current, voltage and frequency

C. Current and voltage

D. Current only

71. In aluminium conductors, steel core is provided to____________?
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A. compensate for skin effect

B. increase the tensile strength

C. neutralise proximity effect

D. reduce line inductance

72. Large industrial consumers are supplied electrical energy at__________________?
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A. 400 V

B. 400 kV

C. 11 kV

D. 66 kV

73. By which of the following systems electric power may be transmitted ?
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A. Overhead system

B. Underground system

C. Both A. and (b)

D. None of the above

74. Series capacitors on transmission lines are of little use when the load VAR requirement is___________?
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A. fluctuating

B. small

C. large

D. any of the above

75. Which of the following relays is used on long transmission lines?
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A. Impedance relay

B. Mhos relay

C. None of the above

D. Reactance relay

76. Transmission voltage of 11 kV is normally used for distances up to_____km?
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A. 80100 km

B. 4050 km

C. 6070 km

D. 2025 km
77. Overhead system can be designed for operation up to____________?
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A. 400 kV

B. 33 kV

C. 11 kV

D. 66 kV

78. The effect of corona can be detected by___________?
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A. all of the above

B. faint luminous glow of bluish colour

C. presence of ozone detected by odour

D. hissing sound

79. Owing to skin effect:
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A. none of the above

B. portion of the conductor near the surface carries more current and core of the conductor carries less current

C. current flows through the half cross-section of the conductor

D. any of the above

E. portion of the conductor near the surface carries less current and core of the conductor carries more current

80. Aluminium has a specific gravity of___________?
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A. 7.8

B. 1.5

C. 4.2

D. 2.7