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Three Phase Induction Motors

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

Large
As small as possible
Very large
1

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Three Phase Induction Motors
An induction motor is preferred to a dc motor because it _______

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

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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
Stator resistance test
Blocked rotor test

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

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

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

1.5 %
4%
2%
Less than 1%

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Three Phase Induction Motors
The reactance of the rotor circuit of a 3-phase induction motor is maximum at

Half full load
Full load
No load
Starting

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