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Three Phase Induction Motors

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

Straight line
Rectangular parabola
Parabola
Hyperbola

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Three Phase Induction Motors
The direction of rotation of field in a 3 phase induction motor depends upon _____

Magnitude of supply voltage
Supply frequency
Number of poles
Phase sequence of supply voltage

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Three Phase Induction Motors
The stator of a three phase induction motor produces _______ magnetic field.

None of the listed here
Rotating
Steady
Alternating

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Three Phase Induction Motors
The crawling in an induction motor is caused by

High loads
Low voltage supply
Harmonics developed in the rotor
Improper design of machine

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Three Phase Induction Motors
The frame of an induction motor is usually made of

Aluminium
Cast iron
Bronze
Silicon steel

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Three Phase Induction Motors
A four speed squirrel cage induction motor uses______ stator windings.

Three
Two
One
Four

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