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Three Phase Induction Motors

Three Phase Induction Motors
In induction motor, percentage slip depends on

None of these
Supply frequency
Copper losses in motor
Supply voltage

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

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

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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will run at reduced speed
The motor will run in reverse direction
The motor will burn
The motor will not run

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Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

Delta
Partly star and partly delta
Star
None of the listed here

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Three Phase Induction Motors
The advantage of wound rotor motor is that _______

It is inexpensive
It requires less maintenance
External resistance can be inserted in the rotor circuit
None of the listed here

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

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