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Three Phase Induction Motors

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

1
Large
Very large
As small as possible

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Three Phase Induction Motors
A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

500 W
200 W
980 W
20 W

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Three Phase Induction Motors
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

2.5 Hz
0.05 Hz
1.5 Hz
5 Hz

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Three Phase Induction Motors
If the frequency of 3-phase supply to the stator of a 3-phase induction motor is increased, then synchronous speed ______

Is decreased
Remains unchanged
None of the listed here
Is increased

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Three Phase Induction Motors
In an induction motor, no load the slip is generally

1.5 %
2%
Less than 1%
4%

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Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Slip ring
Synchronous
Commutator
Series

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