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Three Phase Induction Motors

Three Phase Induction Motors
The speed of a squirrel cage induction motor is changed by

None of the listed here
Cascade control
Pole changing
Rheostatic control

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

Rotor current
Rotor emf
Shaft diameter
Rotor power factor

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Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

Smaller than
Equal to
None of the listed here
Greater than

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

Large
Practically zero
Small
None of the listed here

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Three Phase Induction Motors
The condition of induction motor at no load resemble those of a transformer whose secondady is _______

Short-circuited
Open circuited
None of the listed here
Supplying a variable resistive load

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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
1000 rpm
1440 rpm
730 rpm

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