Electrical Engineering MCQs

Page No. 159

Shunt capacitance is neglected while considering______________?


ashort transmission line


bmedium transmission line


clong transmission line


dmedium and long transmission lines



Ionization in circuit breaker is facilitated by___________?


a high temperature


bincrease of mean free path


cincreasing field strength


d all of the above


View Answer all of the above

A transmission line is protected by_____________?


ainrush protection


b distance protection


ctime graded and current graded over current protection


d both (B) and (C)


View Answer both (B) and (C)

When a transmission line is energized, the wave that propagates on it is____________?


acurrent wave only


bvoltage wave only


c Both (A) and (B)


dpower factor wave only


View Answer Both (A) and (B)

Burden of a protective relay is the power______________?


arequired to operate the circuit breaker


babsorbed by the circuit of relay


cdeveloped by the relay circuit


dnone of the above



The current zero interruption, in oil and air blast circuit breakers, is achieved by____________?


alengthening of the gap


bcooling and blast effect


c both (A) and (B)


ddeionizing the oil with forced air


View Answer both (A) and (B)

The current zero interruption, in oil and air blast circuit breakers, is achieved by_______________?


a lengthening of the gap


b cooling and blast effect


cboth A. and B


d deionizing the oil with forced air


View Answer both A. and B

The relay operating speed depends upon_________________?


athe spring tension


b the rate of flux built up


carmature core air gap


dall of the above


View Answer all of the above

Relays can be designed to respond to changes in________________?


a resistance, reactance or impedance


b voltage and current


ctemperature


d all above


View Answer all above

An efficient and a well designed protective relaying should have_____________?


agood selectivity and reliability


beconomy and simplicity


chigh speed and selectivity


dall of the above


View Answer all of the above

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