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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
The starting torque of a 3-phase induction motor is _______ supply voltage.

None of the listed here
Directly proportional to sqaure of
Independent of
Directly proportional to

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

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

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

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Three Phase Induction Motors
The condition of induction motor at stand still resemble those of a transformer whose secondady is _______

Open circuited
Supplying a variable resistive load
Short circuited
None of the listed here

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

Rheostatic control
Pole changing
Cascade control
None of the listed here

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