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Three Phase Induction Motors

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

Four times
Two times
Equal to
None of the listed here

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Three Phase Induction Motors
An induction motor is preferred to a dc motor because it _______

Provides high starting torque
Has simple and rugged construction
None of the listed here
Provides fine speed control

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Three Phase Induction Motors
The cogging of an induction motor can be avoided by

Auto transformer starter
Using DOL starter
Having number of rotor slots more or less than the number of stator slots
Proper ventilation

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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.

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

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Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

S
S/1-S
1/S
1-S

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Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

High resistance
High inductance
None of the listed here
Low resistance

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