Switchgear protections Archives - Page 2 of 10 - MCQ and Quiz for Exams

11. The line insulation is the insulation level of the station equipment.

less than

same as

more than

proportional to E. not directly related with

Detailed SolutionThe line insulation is the insulation level of the station equipment.

12. Large internal faults are protected by

merz price percentage differential protection

mho and ohm relays

horn gaps and temperature relays

earth fault and positive sequence relays

Detailed SolutionLarge internal faults are protected by

13. Over voltage protection is recommended for

hydro-electric generators

steam turbine generators

gas turbine generators

all of the above E. none of the above

Detailed SolutionOver voltage protection is recommended for

14. Series reactors should have

low resistance

high resistance

low impedance

high impedance

Detailed SolutionSeries reactors should have

15. Shunt capacitance is neglected while considering

short transmission line

medium transmission line

long transmission line

medium and long transmission lines

Detailed SolutionShunt capacitance is neglected while considering

16. Relays are used for phase faults on long line.

Impedance

Reactance

Either of the above

None of the above

Detailed SolutionRelays are used for phase faults on long line.

17. Burden of a protective relay is the power

required to operate the circuit breaker

absorbed by the circuit of relay

developed by the relay circuit

none of the above

Detailed SolutionBurden of a protective relay is the power

18. With which of the following, a circuit breaker must be equipped for remote operation ?

Inverse time trip

Time-delay trip

Shunt trip

None of the above E. All of the above

Detailed SolutionWith which of the following, a circuit breaker must be equipped for remote operation ?

19. An isolator is installed

to operate the relay of circuit breaker

as a substitute for circuit breaker

always independent of the position of circuit breaker

generally on both sides of a circuit breaker

Detailed SolutionAn isolator is installed

20. Interruption of large currents by relay requires

arc suppressing blow out coils

wide separation of the opened contacts

high speed opening of contacts

all of the above

Detailed SolutionInterruption of large currents by relay requires

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