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

Multiple Choice Question (MCQ) of Protective Relays page-2


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11. An impedance relay is used for

a) Earth faults
b) Interphase faults
c) Both (a) and (b)
d) None of these

Ans: (c)

12. Relay gets its operating energy from

a) Transformer
b) Alternator
c) Overhead lines
d) C.T., P.T.

Ans: (d)

13. Good relay should possess

a) Speed & reliability
b) Aped & sensitivity
c) Adequateness & selectivity
d) All of these

Ans: (d)

14. Earthing transformer is used to

a) Improve neutral wire’s current capacity
b) Avoid overheating of transformer
c) Provide artificial earthing
d) Avoid harmonics

Ans: (c)

15. Percentage differential protection is used to prevent against

a) Inter-turn faults
b) Heavy Loads
c) External Faults
d) Magnetizing current

Ans: (d)

16. Back up protection is needed for

a) Over voltage
b) Short circuits
c) Over current
d) All of these

Ans: (b)

17. An instantaneous relay is

a) Permanent moving magnet
b) Induction cup
c) Shaded pole
d) Moving coil

Ans: (a)

18. Relays for transmission line protection are

a) In three zones
b) In two zones
c) Independent of zone
d) None of these

Ans: (a)

19. Induction cup relays responds to

a) Current
b) Power
c) Voltage
d) Impedance

Ans: (d)

20. Split-phase relay responds to

a) Over load faults
b) Over voltage
c) Inter turn faults
d) All of these

Ans: (c)


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