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Three Phase Induction Motors

Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Slip ring
Synchronous
Series
Commutator

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Three Phase Induction Motors
DOL starting of induction motors is usually restricted to

Variable speed motors
Low horsepower motors
High speed motors
High horsepower motors

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

1.5 Hz
0.05 Hz
5 Hz
2.5 Hz

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Three Phase Induction Motors
The speed of a squirrel cage induction motor is changed by

None of the listed here
Rheostatic control
Cascade control
Pole changing

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Three Phase Induction Motors
The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current.

10 to 15%
15 to 20 %
30 to 50%
5%

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Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

None of the listed here
20 to 30 %
10 to 20 %
2 to 5 %

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