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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
An induction motor is so called because its operation depends on

Self induction
Mutual induction
Hysteresis
Eddy currents

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Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

None of the listed here
1-S
1+S
S-1

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

Equal to
Greater than
None of the listed here
Smaller than

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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
1600 rpm
400 rpm
2400 rpm

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Three Phase Induction Motors
The approximate efficiency of a 3-phase , 50 Hz, 4 pole induction motor running at 1350 rpm is ______

90%
65%
40%
None of the listed here

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