Switchgear and Protection Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “Switchgear and Protection”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Switchgear and Protection Mcqs comprehensively.

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A fuse is connected_______________?

In series with circuit

In parallel with circuit

Either in series or in parallel with circuit

None of the above

The steady state stability of the power system can be increased by_____________?

Connecting lines in parallel

Connecting lines in series

Using machines of high impedance

Reducing the excitation of machines

Series capacitors are used to_________________?

Compensate for line inductive reactance

Compensate for line capacitive reactance

Improve line voltage

None of the above

The torque produced in induction type relay (shaded pole structure) is_____________?

Inversely proportional to the current

Inversely proportional to the square of the current

Proportional to the current

Proportional to square of the current

Air blast circuit breakers for 400 kV power system are designed to operate in_______________?

100 microsecond

50 millisecond

0.5 sec

0.1 sec

The fuse wire, in D.C. circuits, is inserted in____________?

Negative circuit only

Positive circuit only

Both (A) and (B)

Either (A) or (B)

A fuse is never inserted in____________?

Neutral wire

Negative of D.C. circuit

Positive of D.C. circuit

Phase dine

A switchgear is device used for_____________?

Interrupting an electrical circuit

Switching an electrical circuit 111.

Switching and controlling an electrical circuit

Switching, controlling and protecting the electrical circuit and equipment

The information to the circuit breaker under fault conditions is provided by____________?


Rewirable fuse

H.R.C. only

All of the above

By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?




All of the above

A balanced 3-phase system consists of_______________?

Zero sequence currents only

Positive sequence currents only

Negative and zero sequence currents

Zero, negative and positive sequence currents

A short-circuit is identified by_____________?

No current flow

Heavy current flow

Voltage drop

Voltage rise

To limit short-circuit current in a power system are used______________?

Earth wires


H.R.C. fuses


In a single bus-bar system there will be complete shut down when____________?

Fault occurs on the bus itself

Fault occurs on neutral line

Two or more faults occur simultaneously

Fault occurs with respect to earthing

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