Index

SymbolsTransformerRelayPower-SystemBasic-electricalACSR-ConductorCircuit-BreakerInterview-questions-of-Basic-ElectricityInterview-questions-of-transformerInsulatorCurrent-TransformerMCQMCQ-powersystemThermal-power-stationInterview-questions-of-Power-SystemPower-ElectronicsInterview-questions-of-Underground-CableInterview-questions-of-IlluminationIlluminationMCQ-of-ElectronicsMCQ-of-Basic-ElectricalMCQ-of-Transformers MCQ-of-D.C-motor MCQ-of-D.C-generatorsMCQ-Control-SystemMCQ-Measurementsmcq-of-Generation-power-systemMCQ-of-Induction-MotorMCQ-of-Transmission-DistributionMCQ-of-Electrical-MachinesMCQ-of-Alternator-and-Synchronous-MotorsMCQ-Electric-PowerMCQ-Illumination

Objective Questions & Answers of Circuit Breaker page-8


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71. Pressure of air in air blast circuit breaker is usually

A) 1 - 5 kg/cm2
B) 5 - 10 kg/cm2
C) 10 - 30 kg/cm2
D) 35 - 100 kg/cm2.

Ans : (C)

72. Air used in air blast circuit breaker

A) must be free from moisture
B) must have oil mist
C) must be ionized
D) must have least carbon dioxide.

Ans : (A)

73. In a circuit breaker, the time duration from the instant of fault to the instant of energizing of the trip coil is known as

A) operating time
B) protection time
C) lead time
D) lag time.

Ans : (B)

74. Which relay is used for feeders ?

A) Buchholz relay
B) Merz price protection
C) Translate relay
D) MHO relay.

Ans : (C)

75. Which of the following relays is used on transformers ?

A) Buchholz relay
B) MHO relay
C) Merz price relay
D) None of the above.

Ans : (A)

76. In a circuit breaker, the time duration from the instant of the fault to the extinction of arc is known as

A) operation time
B) total clearing time
C) lead time
D) lag time.

Ans : (B)

77. In a circuit breaker, the time duration from the instant of fault to the instant of closing of contact is known as

A) Reclosing time
B) Gross time
C) Total time
D) Recycle time.

Ans : (A)

78. MHO relay is used for

A) feeders
B) transmission lines
C) circuit breakers
D) rectifiers.

Ans : (B)

79. Merz price protection is used on

A) substations
B) capacitor banks
C) induction motor
D) generators.

Ans : (D)

80. For high-speed circuit breakers, the total time is nearly

A) Ten cycles
B) Half cycle
C) One cycle
D) Few cycles.

Ans : (B)


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