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-6


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51. The power factor of the arc in circuit breaker is

A) always leading
B) always lagging
C) always zero
D) always unity.

Ans : (D)

52. Sparking between contacts can be reduced by

A) inserting resistance in the line
B) inserting a capacitor in series with the contacts
C) inserting a capacitor in parallel with the contacts
D) none of above.

Ans : (C)

53. The basic function of a circuit breaker is to

A) extinguish the arc
B) transmit voltage by arcing
C) ionize the surrounding air
D) produce the arc

Ans : (A)

54. An automatic device that operates at present values is known as

A) mercury switch
B) fuse
C) contactor
D) relay.

Ans : (D)

55. For the same current, which of the following fuse wires will have the least fusing time ?

A) 18 SWG TIN - 12.5 A
B) 20 SWG TIN - 10 A
C) 22 SWG TIN - 7.5 A
D) 24 SWG TIN - 5 A.

Ans : (D)

56. The arc voltage produced in the circuit breaker is always

A) in phase wire arc current
B) leading the arc current by 90o
C) lagging the arc current by 90o
D) none of above.

Ans : (A)

57. Which of the following contact point metals has the highest melting point ?

A) Copper
B) Gold
C) Tungsten
D) Silver.

Ans : (C)

58. Which of the following metals does not amalgamate with mercury ?

A) Tungsten
B) Molybdenum
C) Nickel alloy
D) All of the above.

Ans : (D)

59. HRC fuses are

A) High rupturing capacity fuses
B) Holding and resisting current fuses
C) Heat reflecting cool fuses
D) High resistance and Capacitance fuses.

Ans : (A)

60. Which of the following is not the method of arc dispersion ?

A) Oil immersion of contacts
B) Magnetic blow out of arc
C) Use of rectifiers
D) Deionization of arc path.

Ans : (C)


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