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Three Phase Induction Motors

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

4%
1.5 %
Less than 1%
2%

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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will run in reverse direction
The motor will burn
The motor will run at reduced speed
The motor will not run

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Three Phase Induction Motors
The rotor of an induction motor runs at

Synchronous speed
Any of the above
Below synchronous speed
Above synchronous speed

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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
When the rotor of a 3-phase induction motor is blocked, the slip is _____

0
0.5
0.1
1

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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
2.5 Hz
5 Hz
1.5 Hz

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