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-7


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61. Oil immersion of contacts is the method of

A) arc dispersion
B) arc prevention
C) deionization
D) none of the above.

Ans : (A)

62. Sparking occurs when a load is switched OFF because the circuit has

A) high capacitance
B) high inductance
C) high resistance
D) none of above.

Ans : (B)

63. Cool gases are solids brought into the arc stream assist in quenching the arc mainly by

A) reducing current density
B) providing arc shield
C) providing parallel paths
D) deionization.

Ans : (D)

64. For magnetic blow out of arc, the magnetic field is produced

A) in the load circuit
B) parallel to the axis of the arc
C) at right angles to the axis of the arc
D) none of above.

Ans : (C)

65. Minimum arcing voltage for platinum is 16 V. It can be therefore concluded that when the voltage is below 16 V

A) it will be possible to interrupt any value of current without bringing contact closer to one another
B) it will be possible to interrupt any value of current without arcing
C) it will not be possible to pass the current
D) it will not be possible to interrupt the circuit.

Ans : (B)

66. Minimum arcing voltage will be least in case of

A) silver
B) tungsten
C) graphite
D) carbon.

Ans : (A)

67. For the contact and their material, which of the following should have low value

A) Thermal capacity
B) Contact resistance
C) Thermal conductivity
D) All of the above.

Ans : (B)

68. Air blast circuit breakers are usually used for

A) instantaneous duty
B) permanent break
C) repeated duty
D) intermittent duty.

Ans : (C)

69. Flame proof switch gears are usually preferred

A) in high MVA capacity circuits
B) in mines
C) substations
D) on transmission lines of low voltage.

Ans : (B)

70. For a circuit breaker ‘break time’ is

A) same as opening time
B) opening time + arc duration
C) opening time + arc duration + resistor current duration.

Ans : (C)


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