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Three Phase Induction Motors

Three Phase Induction Motors
The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Absent
Infinity
Small
Large

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

300 rpm
1000 rpm
600 rpm
1200 rpm

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Three Phase Induction Motors
The shape of the torque/slip curve of induction motor is

Hyperbola
Parabola
Rectangular parabola
Straight line

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

Line voltage
Rotor current
Slip
Running torque

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

99%
80 to 90%
95 to 98 %
60 to 90%

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

None of the listed here
Rheostatic control
Pole changing
Cascade control

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