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-3


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21. Time classification of relays includes

a) Instantaneous relays
b) Definite time lag
c) Inverse time lag
d) All of these

Ans: (d)

22. Directional relays responds to

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

Ans: (a)

23. Single phase preventers are used for

a) Transmission lines
b) Transformers
c) Motors
d) Underground cables

Ans: (c)

24. In carrier current protection, wave trap is used is for trapping

a) High frequency waves entering in generating units
b) Power frequency waves
c) Both (a) and (b)
d) None of these

Ans: (a)

25. Operating current in relay is

a) A.c. only
b) D.c. only
c) Both (a) and (b)
d) None of these

Ans: (c)

26. For phase fault on long line, which relay is used?

a) MHO relays
b) Reactance relays
c) Impedance relays
d) All of these

Ans: (c)

27. For motor protection, which relay is used?

a) Thermocouple type relays
b) Bimetallic relays
c) Electronic relays
d) All of these

Ans: (d)

28. For protection against synchronizing power surges, which relay is used?

a) Split-phase relays
b) Impedance relays
c) Reactance relays
d) MHO relays

Ans: (d)

29. Pilot wire protection is for

a) Overhead lines
b) Transformer
c) Motors
d) Cables

Ans: (a)

30. Under voltage relays are used for

a) Motors
b) Alternators
c) Bus bars
d) All of these

Ans: (d)


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