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 Type Question or MCQ of Power System Protection page-5


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41. Various power system faults in increasing order of severity are

a) LG,LL,LLG,LLLG
b) LLLG,LLG,LG,LL
c) LLG,LLLG,LL,LG
d) LL,LG,LLLG,LLG

Ans: (a)

42. Which of following are used to reduce short circuit fault currents

a) Reactors
b) Resistors
c) Capacitors
d) Parallel combination of all these

Ans: (a)

43. Which of the following type of reactors are popularly used in power systems?

a) Compensation reactors
b) Current limiting reactors
c) Suppression or Peterson reactors
d) All of these

Ans: (d)

44. Oil immersed type reactor has the advantage of

a) Higher safety against flashover
b) Smaller size with large thermal capacity
c) Limiting the fault voltage
d) Both (a) and (b) above

Ans: (a)

45. Shunt reactors are connected with transmission lines for

a) Limiting fault current
b) Absorbing reactive power
c) Absorbing high voltage surges
d) Limiting fault current

Ans: (b)

46. Which of the following method of protection is used to achieve earth fault operation?

a) Core balance method
b) Relay connected with neutral to ground
c) Frame leakage method
d) None of these

Ans: (a)

47. Minimum faults occur in which of the following power system equipment?

a) Transformer
b) Switch gear
c) CT, PT
d) Alternator

Ans: (d)

48. Large internal faults below oil level are protected by

a) Mho and ohm relays
b) Horn gap and temperature relay
c) Merz Price percentage differential relay
d) Earth fault and positive sequence relay

Ans: (b)

49. Interruption due to fault and maintenance is minimum in

a) Main and transfer bus arrangement
b) Single bus arrangement
c) Sectionalized single bus arrangement
d) Double bus, double breaker arrangement

Ans: (d)

50. When a line-to-line fault occurs, the short circuit current of an alternator depends upon its

a) Subtransient reactance
b) Transient reactance
c) Synchronous reactance
d) Short circuit reactance

Ans: (c)


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