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Three Phase Induction Motors

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
300 rpm
1000 rpm
1200 rpm

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

Large
1
Very large
As small as possible

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

Cast iron
Stainless steel
Carbon steel
High speed steel

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

95 to 98 %
99%
60 to 90%
80 to 90%

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

Series
Slip ring
Synchronous
Commutator

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Three Phase Induction Motors
If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______

Increased two times
Increased four times
Decreased two times
Decreased four times

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