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Three Phase Induction Motors

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

Rectangular parabola
Hyperbola
Straight line
Parabola

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Three Phase Induction Motors
A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

200 W
500 W
20 W
980 W

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

Any of the listed here
Flexible
Stiff
Hollow

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Three Phase Induction Motors
Slip rings are usually made of

Copper
Aluminium
Carbon
Phospor bronze

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Three Phase Induction Motors
A 3 phase induction motor is ________

Not easily maintainable
Very costly
A variable speed motor
Essentially a constant speed motor

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Three Phase Induction Motors
At starting of a double squirrel cage induction motor _______

Lower winding is more effective
Outer cage winding has good pf
Lower cage winding has low reactance
None of the listed here

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