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Three Phase Induction Motors

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

40%
90%
65%
None of the listed here

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

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

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Three Phase Induction Motors
Which of the following component is usually fabricated out of silicon steel?

None of these
Shaft
Bearings
Stator core

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Three Phase Induction Motors
The power factor of an induction motor under no load conditions will be closer to

Unity
0.2 lagging
0.2 leading
0.5 leading

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Three Phase Induction Motors
The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

High reactance
Low resistance
Large slip
high resistance

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Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

None of the listed here
Partly star and partly delta
Star
Delta

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