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Three Phase Induction Motors

Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

S/1-S
1/S
S
1-S

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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
Same as full load torque
Negligible

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

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

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Three Phase Induction Motors
The shaft of induction motor is made of

Hollow
Stiff
Any of the listed here
Flexible

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Three Phase Induction Motors
The starting torque of an induction motor is maximum when rotor resistance per phase is _____ rotor reactance / phase.

Equal to
Two times
Four times
None of the listed here

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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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