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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 _____

1000 rpm
1200 rpm
600 rpm
300 rpm

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

Bearings
None of these
Stator core
Shaft

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Three Phase Induction Motors
For the same kVA rating, the leakage flux in induction motor is _______ that of transformer.

Less than
None of the listed here
More than
About the same

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of rotor bars is generally ________

Prime number
Equal to stator poles
None of the listed here
Even number

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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
high resistance
Large slip

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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

50 Hz
2 Hz
20 Hz
200 Hz

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