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Three Phase Induction Motors

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

None
One
Three
Two

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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
S
1-S
1/S

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

No load current is decreased
Leakage reactances are increased
Leakage reactances are decreased
None of the listed here

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

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

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Three Phase Induction Motors
An induction motor is

Non self starting
Self starting with low torque
Self starting with zero torque
Self starting with high torque

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