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-10


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91. Normally the fuse elements are in parts which are connected in the middle by ten bridges. The melting point of tin bridge is

A) 35o C
B) 88o C
C) 230o C
D) 540o C.

Ans : (C)

92. Most of the fuses operate due to

A) magnetic effect of current
B) heating effect of current
C) electrostatic effect of current
D) none of the above.

Ans : (B)

93. Which of the following is a conducting medium for electric current ?

A) Plasma
B) Dissociated gas
C) High temperature gas
D) Low temperature gas.

Ans : (A)

94. A fuse is normally a

A) power factor correcting device
B) power limiting device
C) voltage limiting device
D) current limiting device.

Ans : (D)

95. Flash point of dielectric is usually above

A) 80o C
B) 100o C
C) 140o C
D) 240o C.

Ans : (C)

96. Sphere gaps arc used for

A) measurement of high dc voltage
B) measurement of high ac voltage
C) measurement of impulse voltage
D) all of the above.

Ans : (D)

97. The protection against over-voltage due to lightening is provided by

A) use of surge diverters
B) low tower footing resistance
C) use of overhead ground wires
D) any of the above.

Ans : (D)

98. Which of the following is the demerit of SF6 circuit breakers ?

A) Sealing problem of gas
B) In flux of moisture in the gas system is dangerous
C) Deterioration of quality of circuit breakers affects reliability of circuit breaker
D) All of the above.

Ans : (D)

99. Dielectric strength of SF6 is

A) more at lower pressure and low at higher pressures
B) more than that of oil used in OCB
C) less than that of oil used in OCB
D) less than that of air at atmospheric pressure.

Ans : (C)

100. During arc extinction SF6 gas

A) reduces to SF3
B) gets oxidized
C) decomposes into SF4 and SF2
D) decomposes into S and F ions.

Ans : (C)


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