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MCQs 1: relays are used for phase faults on long line?

Impedance Reactance Either of the above None of the above
Answer Explanation

MCQs 2: relay is preferred for phase fault on short transmission line?

Induction type Reactance Impedance None of the above
Answer Explanation

MCQs 3: For which of the following ratings of the transformer differential protection is recommended ?

above 30 kVA equal to and above 5 MVA equal to and above 25 MVA none of the above
Answer Explanation

MCQs 4: The short circuit in any winding of the transformer is the result of_______________?

mechanical vibration insulation failure loose connection impulse voltage
Answer Explanation

MCQs 5: The short circuit in any winding of the transformer is the result of______________?

mechanical vibration insulation failure loose connection impulse voltage
Answer Explanation

MCQs 6: Which of the following circuit breakers has high reliability and minimum maintenance ?

Air blast circuit breakers Circuit breaker with SF6 gas Vacuum circuit breakers Oil circuit breakers
Answer Explanation

MCQs 7: Over voltage protection is recommended for______________?

hydro-electric generators steam turbine generators gas turbine generators all of the above none of the above
Answer Explanation

MCQs 8: What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?

Zero Unity Infinity None of the above
Answer Explanation

MCQs 9: Arc in a circuit breaker is interrupted at___________?

zero current maximum current minimum voltage maximum voltage
Answer Explanation

MCQs 10: The single phasing relays are used for the protection of_____________?

single phase motors only two phase motors only two single phase motors running in parallel three phase motors
Answer Explanation

MCQs 11: Series reactors should have________________?

low resistance high resistance low impedance high impedance
Answer Explanation

MCQs 12: The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?

heavy loads internal short-circuits external short-circuits all of the above
Answer Explanation

MCQs 13: Which of the following parameter can be neglected for a short line ?

Inductance Capacitance Resistance Reactance
Answer Explanation

MCQs 14: The under voltage relay can be used for______________?

generators busbars transformers motors all of the above
Answer Explanation

MCQs 15: For which of the following protection from negative sequence currents is provided ?

Generators Motors Transmission line Transformers
Answer Explanation

MCQs 16: Bus coupler is very essential in arrangement______________?

single bus double bus, double breaker main and transfer bus all of the above
Answer Explanation

MCQs 17: For cost and safety, the outdoor substations are installed for voltages above_________________?

11 kV 33 kV 60kV 110kV
Answer Explanation

MCQs 18: Short-circuit currents are due to_______________?

single phase to ground faults phase to phase faults two phase to ground faults three phase faults any of these
Answer Explanation

MCQs 19: A.C. network analyser is used to solve problems of_______________?

load flow load flow and short-circuit load flow and stability load flow, short-circuit and stability none of the above
Answer Explanation

MCQs 20: To reduce short circuit fault currents are used_____________?

reactors resistors capacitors none of the above
Answer Explanation

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