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Month: December 2018

Overfluxing protection is recommended for_____________?

August 11, 2021December 17, 2018 by admin
Overfluxing protection is recommended for_____________?

A. distribution transformer
B. generator transformer of the power plant
C. auto-transformer of the power plant
D. station transformer of the power plant

Categories Switchgear and Protection

If the fault occurs near the impedance relay, the VII ratio will be____________?

August 11, 2021December 17, 2018 by admin
If the fault occurs near the impedance relay, the VII ratio will be____________?

A. constant for all distances
B. lower than that of if fault occurs away from the relay
C. higher than that of if fault occurs away from the relay
D. none of the above

Categories Switchgear and Protection

The inductive interference between power and communication line can be minimized by__________?

August 11, 2021December 17, 2018 by admin
The inductive interference between power and communication line can be minimized by__________?

A. transposition of the power line
B. transposition of the communication line
C. both (A) and (B)
D. increasing the distance between the conductors

Categories Switchgear and Protection

transmission line has reflection coefficient as one?

August 11, 2021December 17, 2018 by admin
transmission line has reflection coefficient as one?

A. Open circuit
B. Short-circuit
E. Long
D. None of the above

Categories Switchgear and Protection

The relay with inverse time characteristic will operate within____________?

August 11, 2021December 17, 2018 by admin
The relay with inverse time characteristic will operate within____________?

A. 1.5 sec
B. 5 to 10 sec
C. 5 to 20 sec
D. 20 to 30 sec
E. none of the above

Categories Switchgear and Protection

Which of the following devices will receive voltage surge first travelling on the transmission line ?

August 11, 2021December 17, 2018 by admin
Which of the following devices will receive voltage surge first travelling on the transmission line ?

A. Lightning arresters
B. Relays
C. Step-down transformer
D. Switchgear

Categories Switchgear and Protection

A _________ is used to measure the stator % winding temperature of the generator?

August 11, 2021December 17, 2018 by admin
A _________ is used to measure the stator % winding temperature of the generator?

A. thermocouple
B. pyrometer
C. resistance thermometer
D. thermometer

Categories Switchgear and Protection

Distance relays are generally_____________?

August 11, 2021December 17, 2018 by admin
Distance relays are generally_____________?

A. split-phase relays
B. reactance relays
C. impedance relays
D. none of the above

Categories Switchgear and Protection

relays are used for phase faults on long line?

August 11, 2021December 17, 2018 by admin
relays are used for phase faults on long line?

A. Impedance
B. Reactance
C. Either of the above
D. None of the above

Categories Switchgear and Protection

relay is preferred for phase fault on short transmission line?

August 11, 2021December 17, 2018 by admin
relay is preferred for phase fault on short transmission line?

A. Induction type
B. Reactance
C. Impedance
D. None of the above

Categories Switchgear and Protection
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