Switchgear protections

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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