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Three Phase Induction Motors

Three Phase Induction Motors
The reactance of the rotor circuit of a 3-phase induction motor is maximum at

Full load
No load
Half full load
Starting

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Three Phase Induction Motors
The maximum torque in an induction motor depends on

Square of supply voltage
All of the listed here
Frequency
Rotor inductive reactance

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Three Phase Induction Motors
Less maintenance troubles are experienced in case of

Slip ring induction motor
None of these
Squirrel cage induction motor
Both (A) and (B)

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

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

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

Unity
0.2 leading
0.2 lagging
0.5 leading

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

Slip ring
Synchronous
Series
Commutator

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