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Three Phase Induction Motors

Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

(1+S) × rotor input
(1-S) × rotor input
(S-1) × rotor input
S × rotor input

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

Bearings
Shaft
None of these
Stator core

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

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

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Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

1+S
1-S
S-1
None of the listed here

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Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

2 to 5 %
None of the listed here
20 to 30 %
10 to 20 %

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Three Phase Induction Motors
In an induction motor if air gap increased

The power factor will be low
Bearing friction will reduce
Copper loss will reduce
Windage losses will be more

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