Computer Programming MCQs

5739 MCQs  (Page 196 of 574)

Attempt Computer Programming MCQs Quiz
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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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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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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A transmission line is protected by_____________?
A. inrush protection
B. distance protection
C. time graded and current graded over current protection
D. both (b) and (c)
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Ionization in circuit breaker is facilitated by___________?
A. high temperature
B. increase of mean free path
C. increasing field strength
D. all of the above
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Shunt capacitance is neglected while considering______________?
A. short transmission line
B. medium transmission line
C. long transmission line
D. medium and long transmission lines
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Overheating of relay contacts or contact born out is due to_______________?
A. slow making and breaking of load circuit contacts
B. foreign matter on the contact surface
C. too low contact pressure
D. all of the above
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The arc voltage produced in A.C. circuit breaker is always_____________?
A. in phase with the arc current
B. lagging the arc current by 90″
C. leading the arc current by 90°
D. none of the above
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Interruption of large currents by relay requires______________?
A. arc suppressing blow out coils
B. wide separation of the opened contacts
C. high speed opening of contacts
D. all of the above
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The ground wire should not be smaller than No _________ copper
A. 2
B. 4
C. 6
D. 10
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Word of the Day
22 Jul
Combative
ready or eager to fight or argue.
لڑاکا، متنازع، جھگڑالو

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