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Three Phase Induction Motors

Three Phase Induction Motors
A 3 phase induction motor is ________

Essentially a constant speed motor
A variable speed motor
Very costly
Not easily maintainable

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Three Phase Induction Motors
If the rotor slots are made deeper, rotor resistance is ______

None of the listed here
Increased at starting
Increased under running conditions
Decreased at starting

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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 ______

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

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

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

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Three Phase Induction Motors
The power factor of an induction motor under no load conditions will be closer to

0.2 leading
Unity
0.2 lagging
0.5 leading

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Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Slightly more than full load torque
Low
Negligible
Same as full load torque

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