THREE PHASE INDUCTION MOTORS QUIZ

The torque developed by a 3 phase induction motor least depends on

Rotor current

Rotor emf

Shaft diameter

Rotor power factor

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The term cogging is associated with

Induction motors

Three phase transformer

Compound generators

Dc series motors

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In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Always greater than the number of

Always eqaul to the number of

Either more or less than the number of

Always less than the number of

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

None of the listed here

Less than

More than

About the same

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

1

0.5

Practically zero

0.2

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Very large 3-phase induction motors (greater than 25 HP) are started _____

Direct on line

None of the listed here

By auto transformer starting

Star-delta starting

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The starting torque of a squirrel cage induction motor is

Low

Slightly more than full load torque

Negligible

Same as full load torque

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

Steady

None of the listed here

Alternating

Rotating

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The shaft of induction motor is made of

Hollow

Any of the listed here

Flexible

Stiff

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If any two phases for an induction motor are interchanged

The motor will run at reduced speed

The motor will run in reverse direction

The motor will not run

The motor will burn

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