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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
None of the listed here
60 Hz
50 Hz

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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
2 to 5 %
10 to 20 %
20 to 30 %

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Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

1+S
1-S
S-1
None of the listed here

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Three Phase Induction Motors
For higher efficiency of 3-phase induction motor, the slip should be

As small as possible
Very large
Large
1

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Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Negligible
Slightly more than full load torque
Same as full load torque
Low

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

None of the listed here
Cascade control
Pole changing
Rheostatic control

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