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Three Phase Induction Motors

Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

None of the listed here
Greater than
Equal to
Smaller than

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Three Phase Induction Motors
Which of the following component is usually fabricated out of silicon steel?

None of these
Stator core
Shaft
Bearings

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Three Phase Induction Motors
The injected e.m.f. in the rotor of induction motor must have

The same frequency as the slip frequency
Zero frequency
High value for the satisfactory speed control
The same phase as the rotor e.m.f.

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Three Phase Induction Motors
In an induction motor if air gap increased

Copper loss will reduce
The power factor will be low
Bearing friction will reduce
Windage losses will be more

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

High speed steel
Stainless steel
Carbon steel
Cast iron

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

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

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