THREE PHASE INDUCTION MOTORS QUIZ

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

Prime number

Equal to stator poles

Even number

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

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

1

Practically zero

0.2

0.5

TRUE ANSWER : ?
YOUR ANSWER : ?

5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?

1440 rpm

2880 rpm

1000 rpm

730 rpm

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YOUR ANSWER : ?

3-phase wound rotor morors are also called _____ motors.

Synchronous

Slip ring

Commutator

Series

TRUE ANSWER : ?
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The full load slip of a 3-phase induction motor ranges from

None of the listed here

2 to 5 %

20 to 30 %

10 to 20 %

TRUE ANSWER : ?
YOUR ANSWER : ?

In the circle diagram for induction motor, the diameter of the circle represents

Line voltage

Rotor current

Slip

Running torque

TRUE ANSWER : ?
YOUR ANSWER : ?

The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

1.5 Hz

2.5 Hz

5 Hz

0.05 Hz

TRUE ANSWER : ?
YOUR ANSWER : ?

The complete circle diagram of induction motor can be drawn with the help of data found from

Stator resistance test

All of these

Blocked rotor test

No-load test

TRUE ANSWER : ?
YOUR ANSWER : ?

The shaft of induction motor is made of

Flexible

Stiff

Hollow

Any of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

Less maintenance troubles are experienced in terms of

Both squirrel cage and slip ring

Squirrel cage induction motor

Slip ring induction motor

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

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