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Three Phase Induction Motors

Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

Low resistance
High inductance
None of the listed here
High resistance

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

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Three Phase Induction Motors
The condition of induction motor at no load resemble those of a transformer whose secondady is _______

Open circuited
Short-circuited
Supplying a variable resistive load
None of the listed here

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Three Phase Induction Motors
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

50 Hz
200 Hz
20 Hz
2 Hz

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

Very large
1
Large
As small as possible

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Three Phase Induction Motors
Reduced voltage starter can be used with

Squirrel cage induction motor only but not with slip ring motor
None of these
Squirrel cage as well as slip ring induction motor
Slip ring motor only but not with squirrel cage induction motor

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