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Three Phase Induction Motors

Three Phase Induction Motors
A 3 phase induction motor is ________

Very costly
A variable speed motor
Essentially a constant speed motor
Not easily maintainable

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Three Phase Induction Motors
If the rotor slots are made deeper, rotor resistance is ______

None of the listed here
Decreased at starting
Increased at starting
Increased under running conditions

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

300 rpm
600 rpm
1200 rpm
1000 rpm

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Three Phase Induction Motors
A high starting torque can be obtained in a 3phase induction motor by _______

None of the listed here
Increasing rotor reactance
Decreasing rotor resistance
Increasing rotor resistance

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

Always less than the number of
Always greater than the number of
Either more or less than the number of
Always eqaul to the number of

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

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

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