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Three Phase Induction Motors

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

25 Hz
60 Hz
None of the listed here
50 Hz

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Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Rotor emf
Rotor power factor
Rotor current
Shaft diameter

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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

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

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Three Phase Induction Motors
The condition of induction motor at stand still resemble those of a transformer whose secondady is _______

Open circuited
Supplying a variable resistive load
None of the listed here
Short circuited

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Three Phase Induction Motors
An induction motor is

Non self starting
Self starting with low torque
Self starting with high torque
Self starting with zero torque

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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
Provides fine speed control
None of the listed here

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