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-13


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121. Series reactors are installed at strategic locations of power systems to

A) discharge the capacitors
B) pass neutralizing surges of opposite nature
C) directly pass the fault surges to ground
D) bring down the fault level within the capacity of switchgear.

Ans : (D)

122. Fault diverters

A) neutralize the surges by resistors
B) divert the current to earth in the event of short-circuits
C) modify the surge wave shapes
D) none of the above.

Ans : (B)

123. Buchholz relay is operated by

A) Electro-static induction
B) Electromagnetic induction
C) Gas pressure
D) Eddy currents.

Ans : (C)

124. In star connected system without neutral grounding, zero sequence currents are

A) zero
B) vector sum of phase currents
C) same as rms value of phase currents
D) same as peak value of phase current.

Ans : (A)

125. In which portion of the transmission system faults occur most frequently ?

A) Underground cables
B) Alternators
C) Overhead lines
D) Transformers.

Ans : (C)

126. Thermal relays are often used in

A) generator protection
B) motor starters
C) transformer protection
D) none of the above.

Ans : (B)

127. Bulk-oil circuit breaker is suitable for voltages upto

A) 36 kV
B) 26 kV
C) 16 kV
D) 10 kV.

Ans : (A)

128. The ohmic value of impedance to be connected in the neutral to ground circuit of a 2000 kVA transformer with earth fault set to 40%, with respect to 400 V side will be

A) 200 ohms
B) 20 ohms
C) 2.0 ohms
D) 0.2 ohm.

Ans : (D)

129. A bimetal strip consists of two metal strips have different

A) coefficient of expansion
B) specific heat
C) thermal conductivity
D) thermal diffusivity.

Ans : (A)

130. The actuating quantity for the relays can be

A) magnitude
B) phase angle
C) frequency
D) any of the above.

Ans : (D)

131. Electromagnetic relays may be operated by

A) electromagnetic attraction
B) electromagnetic induction
C) thermal effect
D) any of the above.

Ans : (D)

132. Which of the following is not a relay using electromagnetic force

A) Induction cup relay
B) Buchholz relay
C) Balanced beam relay
D) Attracted armature type relay.

Ans : (B)

133. Differential protection principle is used in the protection of

A) generators
B) transformers
C) feeders
D) all of the above.

Ans : (D)


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