Electrical Engineering MCQs

Page No. 158

Insulation resistance of high voltage circuit breakers is more than________________?


a1 mega ohms


b10 mega ohms


c 100 mega ohms


d500 mega ohms


View Answer 100 mega ohms

The delay fuses are used for the protection of ___________?


a motors


bpower outlet circuits


c fluorescent lamps


dlight circuits


View Answer motors

The time of closing the cycle, in modern circuit breakers is_____________?


a0.003 sec


b 0.001 sec


c0.01 sec


d0.10 sec


View Answer 0.003 sec

For the protection of power station buildings against direct strokes the requirements are___________?


a interception


b interception and conduction


cinterception, conduction and dissipation


d interception, conduction, dissipation and reflection



Wave trap is used to trap waves of__________________?


apower frequencies


b higher frequencies entering generator or transformer units


ceither of the above


dnone of the above



Resistance grounding is used for voltage between_________________?


a33kVto66kV


bHkVto33kV


c3.3kVandllkV


d none of the above


View Answer 3.3kVandllkV

The ground wire should not be smaller than No _________ copper


a2


b 4


c6


d10


View Answer 10

Interruption of large currents by relay requires______________?


aarc suppressing blow out coils


b wide separation of the opened contacts


chigh speed opening of contacts


dall of the above


View Answer all of the above

The arc voltage produced in A.C. circuit breaker is always_____________?


ain phase with the arc current


blagging the arc current by 90″


c leading the arc current by 90°


dnone of the above



Overheating of relay contacts or contact born out is due to_______________?


aslow making and breaking of load circuit contacts


b foreign matter on the contact surface


ctoo low contact pressure


dall of the above


View Answer all of the above

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