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Three Phase Induction Motors

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
1200 rpm
400 rpm
1600 rpm

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

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

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Three Phase Induction Motors
The shape of the torque/slip curve of induction motor is

Parabola
Rectangular parabola
Straight line
Hyperbola

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Three Phase Induction Motors
The approximate efficiency of a 3-phase , 50 Hz, 4 pole induction motor running at 1350 rpm is ______

40%
65%
90%
None of the listed here

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

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Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

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

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