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Three Phase Induction Motors

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

Synchronous
Slip ring
Series
Commutator

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Three Phase Induction Motors
If the frequency of 3-phase supply to the stator of a 3-phase induction motor is increased, then synchronous speed ______

None of the listed here
Remains unchanged
Is increased
Is decreased

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

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

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

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

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

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Three Phase Induction Motors
The air gap between stator and rotor of 3-phase induction motor ranges from ______

2 cm to 4 cm
0.4 mm to 4 mm
1 cm to 2 cm
4 cm to 6 cm

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