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Three Phase Induction Motors

Three Phase Induction Motors
The induction motor has lagging power factor during

Both starting and operation
Starting only
None of the listed here
Operation only

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Three Phase Induction Motors
5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?

2880 rpm
1440 rpm
730 rpm
1000 rpm

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

60 to 90%
95 to 98 %
99%
80 to 90%

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Always eqaul to the number of
Either more or less than the number of
Always less than the number of
Always greater than the number of

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Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Running torque
Line voltage
Rotor current
Slip

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Three Phase Induction Motors
The shaft of an induction motor is made of

Carbon steel
High speed steel
Cast iron
Stainless steel

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