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-1


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1.Ionization in circuit breakers is facilitated by

a) Increase of field strength
b) Increase of mean free path
c) High temperature
d) All of these

Ans: (d)

2. Arc interruption is done by

a) High resistance interruption
b) Low resistance interruption
c) Both (a) and (b)
d) None of these

Ans: (c)

3. Part of circuit breaker helpful in breaking the current is

a) Trip Coil
b) Contacts
c) Handle
d) Medium

Ans: (b)

4. Desired tripping of a circuit breaker is

a) Manually
b) Automatically
c) That it should give warning
d) None of these

Ans: (b)

5. Arcing time is the time between

a) Separation of circuit breaker and extinction of arc
b) Separation of circuit breaker and rise of recovery voltage
c) Normal current interruption and arc extinction
d) None of these

Ans: (a)

6. For single frequency transients, ratio of peak restriking voltage to time between voltage zero and peak voltage is called

a) Restriking voltage
b) Recovery voltage
c) Rate of rise restriking voltage
d) Active recovery voltage

Ans: (c)

7. Time between energisation of trip coil and separation of contacts is called

a) Closing time
b) Opening time
c) Both (a) and (b)
d) None of these

Ans: (d)

8. In circuit breaker, to facilitate arc quenching, dielectric strength can be increased by

a) Lengthening of the gap
b) Cooling
c) Blast effect
d) All of these

Ans: (d)

9. Rate of rise restriking voltage depends upon

a) Active recovery voltage
b) Natural frequency of oscillations
c) Both (a) and (b)
d) Rating of circuit breaker

Ans: (c)

10. An ideal circuit breaker should offer

a) Zero & infinite impedance before & after interruption respectively
b) Infinity & zero impedance before & after interruption respectively
c) Equal impedance before & after interruption
d) None of these

Ans: (a)


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