THREE PHASE INDUCTION MOTORS QUIZ

If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

None of the listed here

25 Hz

60 Hz

50 Hz

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

Blocked rotor test

All of these

No-load test

Stator resistance test

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For the same kVA rating, the leakage flux in induction motor is _______ that of transformer.

More than

Less than

About the same

None of the listed here

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In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

None of the listed here

Uniform torque

Greater mechanical strength

Less rotor losses

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The frame of an induction motor is usually made of

Bronze

Aluminium

Silicon steel

Cast iron

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DOL starting of induction motors is usually restricted to

Low horsepower motors

High speed motors

High horsepower motors

Variable speed motors

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

Infinity

Small

Large

Absent

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The low power factor of induction motor is due to

Stator reactance

All of these

Rotor leakage reactance

The reactive lagging magnetizing current necessary to generate the magnetic flux

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

None of the listed here

Equal to stator poles

Even number

Prime number

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When the rotor of a 3-phase induction motor is blocked, the slip is _____

0.1

0.5

0

1

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YOUR ANSWER : ?

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