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Three Phase Induction Motors

Three Phase Induction Motors
An induction motor is so called because its operation depends on

Mutual induction
Eddy currents
Self induction
Hysteresis

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

No load current is decreased
Leakage reactances are increased
Leakage reactances are decreased
None of the listed here

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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
The direction of rotation of field in a 3 phase induction motor depends upon _____

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

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Three Phase Induction Motors
The induction motor has lagging power factor during

Operation only
Both starting and operation
Starting only
None of the listed here

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Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Series
Synchronous
Commutator
Slip ring

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