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Three Phase Induction Motors

Three Phase Induction Motors
The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current.

30 to 50%
15 to 20 %
5%
10 to 15%

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Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Slip
Rotor current
Line voltage
Running torque

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

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

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Three Phase Induction Motors
In an induction motor, no load the slip is generally

Less than 1%
1.5 %
2%
4%

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Three Phase Induction Motors
Very large 3-phase induction motors (greater than 25 HP) are started _____

By auto transformer starting
Direct on line
None of the listed here
Star-delta starting

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Three Phase Induction Motors
A high starting torque can be obtained in a 3phase induction motor by _______

Decreasing rotor resistance
Increasing rotor resistance
None of the listed here
Increasing rotor reactance

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