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Three Phase Induction Motors

Three Phase Induction Motors
In a squirrel cage induction motor, the number of rotor bars is generally ________

Equal to stator poles
Even number
Prime number
None of the listed here

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

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

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Three Phase Induction Motors
In an induction motor if air gap increased

The power factor will be low
Windage losses will be more
Bearing friction will reduce
Copper loss will reduce

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Three Phase Induction Motors
The condition of induction motor at stand still resemble those of a transformer whose secondady is _______

None of the listed here
Open circuited
Short circuited
Supplying a variable resistive load

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Three Phase Induction Motors
If the frequency of 3-phase supply to the stator of a 3-phase induction motor is increased, then synchronous speed ______

Is decreased
Remains unchanged
Is increased
None of the listed here

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Three Phase Induction Motors
The maximum torque in an induction motor depends on

All of the listed here
Rotor inductive reactance
Frequency
Square of supply voltage

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