Induction cup relay is operated due to changes in________________?
A. current
B. voltage
C. impedance
D. all of the above
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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
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The reflection co-efficient at the open circuited end of a transmission line___________?
A. zero
B. infinity
C. unity
D. none of the above
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The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to______________?
A. lubricate the contacts
B. insulate the contacts from switch body
C. extinguish the arc
D. all of the above
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H.R.C. fuses provide best protection against________________?
A. overload
B. reverse current
C. open-circuits
D. short-circuits
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To protect most of the electrical equipment handling low power, the types of relays used are______________?
A. thermocouple
B. electronic and bimetallic
C. both (a) and (b)
D. none of the above
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Which of the following is the least expensive protection for overcurrent is low voltage system ?
A. rewireable fuse
B. isolator
C. oil circuit breaker
D. air break circuit breaker
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Insulation resistance of high voltage circuit breakers is more than________________?
A. 1 mega ohms
B. 10 mega ohms
C. 100 mega ohms
D. 500 mega ohms
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The delay fuses are used for the protection of ___________?
A. motors
B. power outlet circuits
C. fluorescent lamps
D. light circuits
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The time of closing the cycle, in modern circuit breakers is_____________?
A. 0.003 sec
B. 0.001 sec
C. 0.01 sec
D. 0.10 sec
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Word of the Day
14 Sep
Sovereignty
supreme power or authority.
اقتدار، حکومت، راج

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