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Three Phase Induction Motors

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

1200 rpm
300 rpm
1000 rpm
600 rpm

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Three Phase Induction Motors
The approximate efficiency of a 3-phase , 50 Hz, 4 pole induction motor running at 1350 rpm is ______

None of the listed here
90%
40%
65%

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

99%
80 to 90%
60 to 90%
95 to 98 %

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

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Three Phase Induction Motors
Friction and windage loss of a 3 phase induction motor are

Maximum at no load
None of the listed here
Remains the same at all loads
Minimum at no load

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Three Phase Induction Motors
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

20 Hz
2 Hz
200 Hz
50 Hz

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