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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