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Three Phase Induction Motors

Three Phase Induction Motors
The maximum torque in an induction motor depends on

All of the listed here
Frequency
Square of supply voltage
Rotor inductive reactance

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

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

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

Leakage reactances are decreased
None of the listed here
Leakage reactances are increased
No load current is decreased

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Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

0.5
0
0.1
1

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

Low resistance
None of the listed here
High inductance
High resistance

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Three Phase Induction Motors
The speed of a squirrel-cage induction motor can be controlled by all of the following except

Reducing supply voltage
Changing number of poles
Changing winding resistance
Changing supply frequency

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