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Three Phase Induction Motors

Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

(1+S) × rotor input
(S-1) × rotor input
S × rotor input
(1-S) × rotor input

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

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

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Three Phase Induction Motors
One of the speeds of a 2 speed squirrel cage induction motor is 800 rpm. The other speed will be _____

1200 rpm
2400 rpm
400 rpm
1600 rpm

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

Silicon steel
Bronze
Aluminium
Cast iron

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Three Phase Induction Motors
For higher efficiency of 3-phase induction motor, the slip should be

1
As small as possible
Large
Very large

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Three Phase Induction Motors
Slip rings are usually made of

Aluminium
Copper
Phospor bronze
Carbon

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