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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
In an induction motor the relationship between stator slots and rotor slots is that

Stator slots are exact multiple of rotor slots
Stator slots are equal to rotor slots
Stator slots are not exact multiple of rotor slots
None of the listed here

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

Bearings
Shaft
Stator core
None of these

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

0.5 leading
0.2 leading
Unity
0.2 lagging

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Three Phase Induction Motors
Slip rings are usually made of

Phospor bronze
Aluminium
Carbon
Copper

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Three Phase Induction Motors
The condition of induction motor at stand still resemble those of a transformer whose secondady is _______

Supplying a variable resistive load
Short circuited
Open circuited
None of the listed here

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