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Three Phase Induction Motors

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

Very large
1
As small as possible
Large

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

Carbon steel
Cast iron
High speed steel
Stainless steel

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

Practically zero
None of the listed here
Small
Large

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Three Phase Induction Motors
The maximum torque in an induction motor depends on

Frequency
Rotor inductive reactance
All of the listed here
Square of supply voltage

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

4%
1.5 %
2%
Less than 1%

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Three Phase Induction Motors
A high starting torque can be obtained in a 3phase induction motor by _______

Increasing rotor resistance
Increasing rotor reactance
None of the listed here
Decreasing rotor resistance

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