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.Management Sciences
Category: Switchgear and Protection
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
To reduce short circuit fault currents are used_____________?
A. reactors
B. resistors
C. capacitors
D. none of the above
Overload relays are of_______________type
A. induction
B. solid state
C. thermal
D. electromagnetic
E. all above
relays are used for phase faults on long line?
A. Impedance
B. Reactance
C. Either of the above
D. None of the above
Wave trap is used to trap waves of__________________?
A. power frequencies
B. higher frequencies entering generator or transformer units
C. either of the above
D. none of the above
The power loss is an important factor for the design of_______________?
A. transmission line
B. motor
C. generator
D. feeder
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
In a circuit breaker the basic problem is to________________?
A. maintain the arc
B. extinguish the arc
C. transmit large power
D. emit the ionizing electrons
When a wave propagates on a transmission line, it suffers reflection several times at_____________?
A. tapping
B. load end
C. sending end
D. sending and other end
E. all of the above
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
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