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-5


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41. For extra high voltage lines which circuit breaker is preferred

A) Minimum oil circuit breaker
B) SF6 gas circuit breaker
C) Vacuum circuit breaker
D) Bulk oil circuit breaker.

Ans : (B)

42. The number of cycles in which a high-speed circuit breaker can complete its operating is

A) 3 to 8
B) 10 to 18
C) 20 to 30
D) 40 to 50.

Ans : (A)

43. A material best suited for manufacturing of fuse wire is

A) Copper
B) Lead
C) Silver
D) Aluminium.

Ans : (C)

44. In a circuit breaker the current which exists at the instant of contact separation is known as

A) recovery current
B) breaking current
C) surge current
D) restriking current.

Ans : (B)

45. As the force on contact is increased, the contact resistance will

A) decrease
B) remain unaltered
C) increase exponentially
D) increase linearly

Ans : (A)

46. The heat produced at the contact point, due to passage of current, will least depend on

A) current flowing
B) contact resistance
C) temperature of the surrounding medium
D) time during which the current flows.

Ans : (C)

47. Breaking capacity of a circuit breaker is usually expressed in terms of

A) MVA
B) MW
C) Volts
D) Amperes.

Ans : (A)

48. Air blast circuit breakers for 400 kV. Power systems are designed to operate in

A) 50 micro seconds
B) 50 milli seconds
C) 500 milli seconds
D) 50 seconds.

Ans : (B)

49. ‘Kick fuse’ has

A) square law characteristics
B) linear characteristics
C) inverse characteristics
D) none.

Ans : (C)

50. A Merz-price protection is suitable for

A) alternators
B) transformers
C) feeders
D) transmission lines.

Ans : (A)


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