Single Phase Induction Motors Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on “Single Phase Induction Motors”. 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 Single Phase Induction Motors Mcqs comprehensively.

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The capacitors used in single-phase capacitor motors have no__________?

Voltage rating

Dielectric medium

Polarity marking

Definite value

If a D.C. series motor is operated on A.C. supply, it will____________?

Spark excessively

Have poor efficiency

Have poor power factor

All of the above

A universal motor is one which______________?

Can be operated either on D.C. or A.C. supply at approximately the same speed and output

Can be marketed internationally

Runs at dangerously high speed on no-load

All the above

In a A.C. series motor armature coils are usually connected to commutator____________?

Through resistance

Through reactances

Through capacitors


A repulsion motor is equipped with__________?

Slip rings


Both A. and (b)

None of the above

Which of the following motors has two separate windings on the motor ?

Repulsion motor

Repulsion induction motor

Repulsion start induction run motor

None of the above

Which of the following statements regarding a reluctance motor is incorrect ?

It cannot be reversed, ordinarily

It requires no D.C. field excitation for its operation

It is nothing else but a single-phase, salient pole synchronous-induction motor

Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluctance path between stator and rotor

A shaded pole motor does not possess___________?

Centrifugal switch



All of the above

To reverse the direction of rotation of acapacitor start motor while it is running we should___________?

Disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding

Disconnect motor from supply and immediately reconnect it to supply with reversed connections of the main winding

Reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply

Reverse the direction of connections of the auxiliary winding and immediately connect it to supply

In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will_____________?

Become unstable

Draw excessive armature current and may burn out

Fall out of synchronism and come to stand still

Run as induction motor

Most of the fractional horsepower motors have either___________?

Hard and annealed bearings

Ball or roller bearings

Soft and porous bearings

Plain or sleeve bearings

In a universal motor, the most common cause of brush sparking is___________?

Open armature winding

Shorted armature winding

Shorted field winding”

High commutator mica

all of the above

Which of the following statements regarding reluctance-start motor is incorrect ?

It is similar to reluctance motor

It is basically an induction motor and not a synchronous one

So far as its basic working principle is concerned, it is similar to shaded pole motor

The air-gap between rotor and salient poles is non- uniform

If starting winding of a single-phase induction motor is left in the circuit, it will____________?

Run faster

Spark at light loads

Draw excessive current and overheat

Run slower

If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then____________?

Motor will not come up to speed

Motor will not carry the load

Current drawn by the motor will be excessively high

Electrolytic capacitor will, in all probability, suffer break down

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