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Three Phase Induction Motors

Three Phase Induction Motors
DOL starting of induction motors is usually restricted to

High speed motors
Low horsepower motors
Variable speed motors
High horsepower motors

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Three Phase Induction Motors
Friction and windage loss of a 3 phase induction motor are

Maximum at no load
None of the listed here
Minimum at no load
Remains the same at all loads

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

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

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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
Less maintenance troubles are experienced in case of

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

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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
Small
Infinity
Large

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