When a transmission line is energized, the wave that propagates on it is____________?
A. current wave only
B. voltage wave only
C. both (a) and (b)
D. power factor wave only
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Burden of a protective relay is the power______________?
A. required to operate the circuit breaker
B. absorbed by the circuit of relay
C. developed by the relay circuit
D. none of the above
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The current zero interruption, in oil and air blast circuit breakers, is achieved by____________?
A. lengthening of the gap
B. cooling and blast effect
C. both (a) and (b)
D. deionizing the oil with forced air
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The current zero interruption, in oil and air blast circuit breakers, is achieved by_______________?
A. lengthening of the gap
B. cooling and blast effect
C. both a. and b
D. deionizing the oil with forced air
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The relay operating speed depends upon_________________?
A. the spring tension
B. the rate of flux built up
C. armature core air gap
D. all of the above
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Relays can be designed to respond to changes in________________?
A. resistance, reactance or impedance
B. voltage and current
C. light intensity
D. temperature
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An efficient and a well designed protective relaying should have_____________?
A. good selectivity and reliability
B. economy and simplicity
C. high speed and selectivity
D. all of the above
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A differential relay measures the vector difference between_________________?
A. two currents
B. two voltages
C. two or more similar electrical quantities
D. none of the above
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Protective relays are devices that detect abnormal conditions in electrical circuits by measuring_____________?
A. current during abnormal condition
B. voltage during abnormal condition
C. constantly the electrical quantities which differ during normal and abnormal conditions
D. none of the above
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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
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Word of the Day
13 Sep
Conjecture
an opinion or conclusion formed on the basis of incomplete information.
تکہ مارنا، قیاس کرنا، تاویل

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