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Three Phase Induction Motors

Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

99%
80 to 90%
60 to 90%
95 to 98 %

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Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

0.5
0.1
1
0

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Three Phase Induction Motors
Which of the following component is usually fabricated out of silicon steel?

None of these
Stator core
Bearings
Shaft

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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 rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

Star
None of the listed here
Partly star and partly delta
Delta

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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

5 Hz
2.5 Hz
1.5 Hz
0.05 Hz

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