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Three Phase Induction Motors

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

High speed steel
Carbon steel
Cast iron
Stainless steel

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Three Phase Induction Motors
In an induction motor, no load the slip is generally

2%
4%
Less than 1%
1.5 %

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Three Phase Induction Motors
The number of slip rings on a squirrel cage induction motor is usually

None
Two
Three
One

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

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

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

600 rpm
1000 rpm
1200 rpm
300 rpm

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

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

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