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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
2400 rpm
400 rpm
1200 rpm

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Three Phase Induction Motors
The starting torque of a 3-phase induction motor is _______ supply voltage.

Independent of
Directly proportional to
Directly proportional to sqaure of
None of the listed here

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

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

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Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

1-S
1+S
None of the listed here
S-1

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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

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

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

None of the listed here
Small
Practically zero
Large

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