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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

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

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Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

1-S
S
S/1-S
1/S

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

1.5 %
Less than 1%
2%
4%

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Three Phase Induction Motors
Reduced voltage starter can be used with

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

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Three Phase Induction Motors
Size of a high speed motor as compared to low speed motor for the same HP will be

Bigger
Smaller
Any of the listed here
Same

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Three Phase Induction Motors
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

0.05 Hz
5 Hz
1.5 Hz
2.5 Hz

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MORE MCQ ON Three Phase Induction Motors

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