Electrical Engineering MCQs

Page No. 156

Arc in a circuit breaker is interrupted at___________?


azero current


bmaximum current


cminimum voltage


dmaximum voltage


View Answer zero current

The single phasing relays are used for the protection of_____________?


asingle phase motors only


b two phase motors only


ctwo single phase motors running in parallel


dthree phase motors


View Answer three phase motors

Series reactors should have________________?


alow resistance


bhigh resistance


clow impedance


dhigh impedance


View Answer low resistance

The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?


aheavy loads


binternal short-circuits


cexternal short-circuits


d all of the above



Which of the following parameter can be neglected for a short line ?


aInductance


bCapacitance


cResistance


dReactance


View Answer Capacitance

The under voltage relay can be used for______________?


agenerators


b busbars


ctransformers


d all of the above


View Answer all of the above

For which of the following protection from negative sequence currents is provided ?


aGenerators


bMotors


cTransmission line


dTransformers


View Answer Generators

Bus coupler is very essential in arrangement______________?


asingle bus


bdouble bus, double breaker


cmain and transfer bus


d all of the above


View Answer main and transfer bus

Which of the following statements is incorrect ?


aLightning arrestors are used before the switchgear


bShunt reactors are used as compensation reactors


cThe peak short current is (1.8 xV2) times the A.C. component


d The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance



For cost and safety, the outdoor substations are installed for voltages above_________________?


a11 kV


b 33 kV


c60kV


d110kV


View Answer 33 kV

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