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

Multiple Choice Question (MCQ) of Circuit Breaker page-3


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21. Air blast circuit breakers are preferred for

a) Short duty
b) Intermittent duty
c) Repeated duty
d) All of these

Ans: (c)

22. Rating of circuit breaker depends upon

a) Breaking capacity
b) Making capacity
c) Short time capacity
d) All of these

Ans: (d)

23. Phenomenon of arc interruption takes place at

a) Zero voltage
b) Zero current
c) High current
d) High voltage

Ans: (b)

24. Symmetrical breaking current is

a) Peak value of a.c. component
b) Average value of a.c. component
c) R.m.s. value of a.c. component
d) All of these

Ans: (c)

25. Over voltage may be due to

a) Lightning impulse waveform
b) 50 Hz a.c.
c) Peak value of 50 Hz a.c.
d) All of these

Ans: (d)

26. In vacuum breakers, current wave

a) Reaches its maximum value
b) Attains its r.m.s. value
c) Is chopped
d) Attains its average value

Ans: (c)

27. In oil circuit breakers, dielectric strength of oil should be

a) High
b) Low
c) Medium
d) None of these

Ans: (a)

28. Main disadvantage (s) of oil circuit breaker is that it

a) Is easily inflammable
b) May from an explosive mixture with air
c) Requires maintenance
d) All of these

Ans: (d)

29. Breaker should adjust itself to

a) Fault magnitude and time
b) Increased arc and time of quenching
c) R R R V
d) None of these

Ans: (a)

30. At higher currents, the switchgear exhibit

a) Corona effect
b) Skin effect
c) Mechanical stresses
d) Poor regulation

Ans: (b)

31. Plain circuit breaker can’t be used for voltage above

a) 400 V
b) 3.3 kV
c) 11 kV
d) 33 kV

Ans: (c)


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