THREE PHASE INDUCTION MOTORS QUIZ

In a double squirrel cage induction motor, the outer cage winding has _______

None of the listed here

High inductance

Low resistance

High resistance

TRUE ANSWER : ?
YOUR ANSWER : ?

In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

Smaller than

Equal to

None of the listed here

Greater than

TRUE ANSWER : ?
YOUR ANSWER : ?

The shaft of induction motor is made of

Hollow

Flexible

Any of the listed here

Stiff

TRUE ANSWER : ?
YOUR ANSWER : ?

Less maintenance troubles are experienced in case of

Both (A) and (B)

None of these

Squirrel cage induction motor

Slip ring induction motor

TRUE ANSWER : ?
YOUR ANSWER : ?

The rotor of an induction motor runs at

Below synchronous speed

Above synchronous speed

Any of the above

Synchronous speed

TRUE ANSWER : ?
YOUR ANSWER : ?

The starting torque of a squirrel cage induction motor is

Slightly more than full load torque

Negligible

Same as full load torque

Low

TRUE ANSWER : ?
YOUR ANSWER : ?

A wound rotor motor is mainly used in applications where ______

High starting torque is required

Speed control is required

High rotor resistance is required during running

Less costly motor is not required

TRUE ANSWER : ?
YOUR ANSWER : ?

The starting torque of an induction motor is maximum when rotor resistance per phase is _____ rotor reactance / phase.

Equal to

None of the listed here

Four times

Two times

TRUE ANSWER : ?
YOUR ANSWER : ?

An induction motor is preferred to a dc motor because it _______

None of the listed here

Provides fine speed control

Provides high starting torque

Has simple and rugged construction

TRUE ANSWER : ?
YOUR ANSWER : ?

A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

500 W

200 W

980 W

20 W

TRUE ANSWER : ?
YOUR ANSWER : ?

↑