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-12


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111. Which of the following are the voltage waves of magnitude higher than the desirable value ?

A) Over-voltages
B) Surges
C) Transients
D) All of the above.

Ans : (D)

112. In the circuit breaker, the arcing contacts are made of

A) copper tungsten alloy
B) electrolytic copper
C) porcelain
D) aluminium alloy.

Ans : (A)

113. The steepness of the wave-front can be reduced by

A) connecting a capacitance between line and earth
B) connecting an inductor in series with the line
C) either of (A) or (B) above
D) connecting an inductor between line and earth and connecting a capacitor in series with the line.

Ans : (C)

114. The disadvantage offered by ungrounded systems is

A) frequent arcing ground
B) difficult earth fault relaying
C) voltages oscillations
D) all of the above.

Ans : (D)

115. In which method of starting a motor, the starting current is the maximum ?

A) Direct-on-line
B) Stator rotor starter
C) Star-delta starter
D) Auto-transformer.

Ans : (A)

116. Fuse in motor circuit provides

A) over current protection
B) short-circuit protection
C) open-circuit protection
D) none of the above.

Ans : (B)

117. Surge modifiers are used to

A) reduce the steepness of wave-from
B) reduce the voltage of wave-from
C) reduce the current of wave-from
D) modify the shape of wave-front.

Ans : (A)

118. Which statement is correct

A) SF6 gas is yellow in colour
B) SF6 gas has pungent smell
C) SF6 gas is lighter than air
D) SF6 gas is nontoxic.

Ans : (D)

119. The main factor in favour of the use of aluminium as bus bar material is

A) its low density
B) its low cost
C) its high resistivity
D) its low melting point.

Ans : (B)

120. Over-current protection for motor is provided by

A) over-current relay
B) kit kat fuses
C) cartridge fuses
D) all of the above.

Ans : (A)


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