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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 ______

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

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

Stator core
Bearings
None of these
Shaft

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Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

None of the listed here
(1+S) × rotor input
S × rotor input
(1-S) × rotor input

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Three Phase Induction Motors
The shaft of an induction motor is made of

High speed steel
Stainless steel
Carbon steel
Cast iron

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

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Three Phase Induction Motors
Insertion of resistance in the rotor of an induction motor to develop a given torque

Decreases the rotor current
Increases the rotor current
Rotor current becomes zero
Rotor current remains same

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