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THREE PHASE INDUCTION MOTORS

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

200 Hz
50 Hz
20 Hz
2 Hz

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Three Phase Induction Motors
5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?

2880 rpm
730 rpm
1000 rpm
1440 rpm

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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

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

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Three Phase Induction Motors
An induction motor with 1000 r.p.m. speed will have

8 poles
2 poles
6 poles
4 poles

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Three Phase Induction Motors
Less maintenance troubles are experienced in case of

Squirrel cage induction motor
Both (A) and (B)
None of these
Slip ring induction motor

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