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Three Phase Induction Motors

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
An induction motor is preferred to a dc motor because it _______

Has simple and rugged construction
None of the listed here
Provides high starting torque
Provides fine speed control

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Three Phase Induction Motors
The complete circle diagram of induction motor can be drawn with the help of data found from

No-load test
All of these
Blocked rotor test
Stator resistance test

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

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

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

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

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Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Rotor power factor
Rotor emf
Rotor current
Shaft diameter

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