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-11


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101. The over-voltage surges in power system may be caused by

A) lightning
B) switching
C) resonance
D) any of the above.

Ans : (D)

102. SF6 gas is transported in

A) liquid form in cylinders
B) gas cylinders
C) solid form in boxes
D) air cylinders.

Ans : (A)

103. Which of the following statement about SF6 gas is incorrect ?

A) It is non-toxic gas
B) It has dark yellow colour
C) It is non-inflammable
D) It has density 5 times that of air at 20o C.

Ans :(B)

104. Current limiting reactors may be

A) air cooled, air cored
B) oil immersed magnetically shielded
C) oil immersed non-magnetically shielded
D) any of the above.

Ans : (D)

105. Switching over-voltage are more hazardous than lightning surges in case of

A) EHV and UHV system.
B) Unbalanced system
C) 11 kV system
D) Low voltage systems.

Ans : (A)

106. Switch surges may be caused by

A) closing of unchanged line
B) load shedding of receiving end of line
C) switching of magnetizing current
D) any of the above.

Ans : (D)

107. Which of the following protective devices can be used against lightning surges ?

A) Horn gap
B) Surge diverters
C) Lightning arresters
D) Any of the above.

Ans : (D)

108. Resistance grounding is used for voltages

A) above 66 kV
B) between 3.3 kV to 11 kV
C) upto 660 V
D) below 220 V.

Ans : (B)

109. Solid grounding is used for voltages

A) below 660 V
B) bellow 115 V
C) above 220 kV
D) above 11 kV.

Ans : (A)

110. Over-voltage transients may occur due to

A) lightning
B) switching
C) arcing grounds
D) any of the above.

Ans : (D)


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