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Three Phase Induction Motors

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

None of the listed here
Alternating
Steady
Rotating

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Three Phase Induction Motors
Less maintenance troubles are experienced in case of

Slip ring induction motor
Both (A) and (B)
Squirrel cage induction motor
None of these

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

Less rotor losses
Uniform torque
None of the listed here
Greater mechanical strength

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

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

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Three Phase Induction Motors
The rotor of induction motor

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

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Three Phase Induction Motors
The torque developed in the cage induction motor with auto-starter is

k2/torque with direct switching
K2 × torque with direct switching
K × torque with direct switching
k/torque with direct switching

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