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Three Phase Induction Motors

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

0.04 %
14%
4 %
0.4 %

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

Commutator
Slip ring
Series
Synchronous

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Three Phase Induction Motors
The injected e.m.f. in the rotor of induction motor must have

Zero frequency
High value for the satisfactory speed control
The same frequency as the slip frequency
The same phase as the rotor e.m.f.

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Three Phase Induction Motors
The rotor of induction motor

Always revolves in the direction of stator flux
Insufficient data
None of the listed here
Always revolves in the direction opposite to stator flux

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

Running torque
Rotor current
Slip
Line voltage

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

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

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