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Three Phase Induction Motors

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

0
1
0.5
0.1

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Three Phase Induction Motors
A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

980 W
20 W
200 W
500 W

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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 ______

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

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Three Phase Induction Motors
The low power factor of induction motor is due to

Stator reactance
The reactive lagging magnetizing current necessary to generate the magnetic flux
Rotor leakage reactance
All of these

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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 _____

1600 rpm
1200 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.

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

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