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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
The speed of a squirrel cage induction motor is changed by

Cascade control
None of the listed here
Rheostatic control
Pole changing

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

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

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Three Phase Induction Motors
In medium sized induction motor, the slip is generally around

0.4 %
4 %
0.04 %
14%

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Three Phase Induction Motors
Reduced voltage starter can be used with

Slip ring motor only but not with squirrel cage induction motor
Squirrel cage induction motor only but not with slip ring motor
Squirrel cage as well as slip ring induction motor
None of these

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

Carbon steel
High speed steel
Cast iron
Stainless steel

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MORE MCQ ON Three Phase Induction Motors

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