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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 _____

1600 rpm
400 rpm
1200 rpm
2400 rpm

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Three Phase Induction Motors
In medium sized induction motor, the slip is generally around

4 %
0.4 %
0.04 %
14%

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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 ______

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

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Three Phase Induction Motors
The frame of an induction motor is usually made of

Aluminium
Cast iron
Silicon steel
Bronze

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Three Phase Induction Motors
Reduced voltage starter can be used with

Slip ring motor only but not with squirrel cage induction motor
Squirrel cage induction motor only but not with slip ring motor
None of these
Squirrel cage as well as slip ring induction motor

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Three Phase Induction Motors
Friction and windage loss of a 3 phase induction motor are

Maximum at no load
Remains the same at all loads
Minimum at no load
None of the listed here

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