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Three Phase Induction Motors

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

2%
4%
1.5 %
Less than 1%

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Three Phase Induction Motors
In an induction motor the relationship between stator slots and rotor slots is that

Stator slots are equal to rotor slots
None of the listed here
Stator slots are not exact multiple of rotor slots
Stator slots are exact multiple of rotor slots

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Three Phase Induction Motors
Insertion of resistance in the rotor of an induction motor to develop a given torque

Rotor current becomes zero
Increases the rotor current
Rotor current remains same
Decreases the rotor current

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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 _____

2400 rpm
400 rpm
1600 rpm
1200 rpm

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Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Commutator
Slip ring
Series
Synchronous

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

None of the listed here
Less rotor losses
Greater mechanical strength
Uniform torque

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