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Three Phase Induction Motors

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

4%
2%
1.5 %
Less than 1%

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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

0.05 Hz
5 Hz
1.5 Hz
2.5 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
Is increased
None of the listed here

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

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

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Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

Equal to
Smaller than
Greater than
None of the listed here

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Three Phase Induction Motors
In medium sized induction motor, the slip is generally around

0.04 %
14%
4 %
0.4 %

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