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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
The complete circle diagram of induction motor can be drawn with the help of data found from

Blocked rotor test
All of these
Stator resistance test
No-load test

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Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Shaft diameter
Rotor power factor
Rotor emf
Rotor current

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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
In medium sized induction motor, the slip is generally around

0.04 %
4 %
14%
0.4 %

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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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