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Three Phase Induction Motors

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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Three Phase Induction Motors
The number of slip rings on a squirrel cage induction motor is usually

One
Two
Three
None

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Three Phase Induction Motors
The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

Large slip
Low resistance
High reactance
high resistance

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

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

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Three Phase Induction Motors
The direction of rotation of field in a 3 phase induction motor depends upon _____

Magnitude of supply voltage
Supply frequency
Number of poles
Phase sequence of supply voltage

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Three Phase Induction Motors
The stator of a three phase induction motor produces _______ magnetic field.

Steady
Alternating
None of the listed here
Rotating

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