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Three Phase Induction Motors

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

1.5 %
Less than 1%
4%
2%

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Three Phase Induction Motors
The condition of induction motor at stand still resemble those of a transformer whose secondady is _______

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

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

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

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Three Phase Induction Motors
DOL starting of induction motors is usually restricted to

Variable speed motors
High speed motors
High horsepower motors
Low horsepower motors

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

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

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

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