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-3


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21. Which of the following circuit breakers does not use pneumatic operating mechanism

A) Air blast circuit breaker
B) SF6 blast circuit breaker
C) Air break circuit breaker
D) Bulk-oil circuit breaker.

Ans : (D)

22. In the above figure D represents

A) Extinction of arc
B) System voltage
C) Restriking voltage
D) Recovery voltage.

Ans : (D)

23. Best protection is provided by HRC fuses in case of

A) Open circuits
B) Short circuits
C) Overloads
D) None of the above.

Ans : (B)

24. For motor circuit breakers, the time of closing the cycle is

A) 0.001 sec
B) 0.01 sec
C) 0.10 sec
D) 0.003 sec.

Ans : (D)

25. A relay used for protection of motors against overload is

A) Impedance relay
B) Electromagnetic attraction type
C) Thermal relay
D) Buchholz’s relay.

Ans : (C)

26. There is definite objection to use of which of the following medium for extinguishing the arc in case of a circuit breaker ?

A) Water
B) Vacuum
C) Air
D) SF6 gas.

Ans : (A)

27. In a circuit breaker, if the insulation resistance between phase terminal and earthed frame is less than the specified limit, the probable cause could be

A) moisture
B) dirty insulation surface
C) carbon or copper particles sticking to the internal surface
D) any of the above.

Ans : (D)

28. If a circuit breaker does not operate on electrical compound, the probable reason could be

A) spring defective
B) trip circuit open
C) trip latch defective
D) any of the above.

Ans : (D)

29. The normal frequency rms voltage that appears across the breaker poles after final arc extinction has occurred, is

A) restriking voltage
B) recovery voltage
C) supply voltage
D) peak voltage.

Ans : (B)

30. Fuse protection is used for current ratings upto

A) 100 A
B) 50 A
C) 20 A
D) 10 A.

Ans : (A)


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