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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 - 1


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1. A circuit breaker is

A) a current interrupting device
B) a waveform correcting device
C) a device to neutralize the effect of transients
D) power factor correcting device.

Ans : (A)

2. SF6 gas is

A) Sulphur hexafluorine
B) Sulphur hexafluoride
C) Sulphur difluoride
D) Sulphur fluoride.

Ans : (B)

3. SF6 gas

A) is non-inflammable
B) is highly toxic
C) has pungent odour
D) is yellow in colour.

Ans : (A)

4. The function of protective relay in a circuit breaker is

A) to each any stray voltages
B) to close the contacts when the actuating quantity reaches a certain predetermined value
C) to limit arcing current during the operating of circuit breaker
D) to provide additional safety in the operation of circuit breaker.

Ans : (B)

5. SF6 gas

A) is lighter than hydrogen
B) is lighter than air
C) has density 2 times as compared to that of air
D) has density 5 times as compared to that of air.

Ans : (D)

6. The pressure of SF6 gas in circuit breakers is of the order of

A) 100 mm Hg
B) 1 kg/cm2
C) 3 to 5 kg/cm2
D) 30 to 50 kg/cm2

Ans : (C)

7. Low voltage circuit breakers have rated voltage of less than

A) 220 V
B) 400 V
C) 1000 V
D) 10,000 V.

Ans : (C)

8. The fault clearing time of a circuit breaker is usually

A) few cycles of supply voltage
B) one second
C) few second
D) few minutes.

Ans : (A)

9. While selecting a gas for circuit breaker, the property of gas that should be considered is

A) high dielectric strength
B) non-inflammability
C) non-toxicity
D) all of the above.

Ans : (D)

10. Out of the following circuit breakers, which one has the lowest voltage range ?

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

Ans : (B)


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