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THREE PHASE INDUCTION MOTORS

Three Phase Induction Motors
When a 3-phase induction motor is at no load, the slip is ______

0.5
1
0.2
Practically zero

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Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

0
0.5
0.1
1

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

50 Hz
60 Hz
None of the listed here
25 Hz

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Three Phase Induction Motors
The direction of rotation of field in a 3 phase induction motor depends upon _____

Phase sequence of supply voltage
Number of poles
Supply frequency
Magnitude of supply voltage

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

4%
1.5 %
Less than 1%
2%

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