THREE PHASE INDUCTION MOTORS QUIZ

The rotor of an induction motor runs at

Above synchronous speed

Any of the above

Below synchronous speed

Synchronous speed

TRUE ANSWER : ?
YOUR ANSWER : ?

The speed of a squirrel cage induction motor is changed by

None of the listed here

Cascade control

Rheostatic control

Pole changing

TRUE ANSWER : ?
YOUR ANSWER : ?

The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Large

Infinity

Absent

Small

TRUE ANSWER : ?
YOUR ANSWER : ?

The stator of a three phase induction motor produces _______ magnetic field.

Rotating

Steady

Alternating

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

Low resistance

Large slip

High reactance

high resistance

TRUE ANSWER : ?
YOUR ANSWER : ?

The full load slip of a 3-phase induction motor ranges from

None of the listed here

10 to 20 %

2 to 5 %

20 to 30 %

TRUE ANSWER : ?
YOUR ANSWER : ?

In an induction motor, no load the slip is generally

4%

1.5 %

2%

Less than 1%

TRUE ANSWER : ?
YOUR ANSWER : ?

In a squirrel cage induction motor, the number of rotor bars is generally ________

None of the listed here

Prime number

Even number

Equal to stator poles

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Four times

Equal to

Two times

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

When a 3-phase induction motor is at no load, the slip is ______

0.2

Practically zero

1

0.5

TRUE ANSWER : ?
YOUR ANSWER : ?

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