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Three Phase Induction Motors

Three Phase Induction Motors
The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Absent
Large
Small
Infinity

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Three Phase Induction Motors
A four speed squirrel cage induction motor uses______ stator windings.

Four
Three
One
Two

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

High reactance
high resistance
Large slip
Low resistance

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

High speed steel
Carbon steel
Cast iron
Stainless steel

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Three Phase Induction Motors
The condition of induction motor on load resemble those of a transformer whose secondady is _______

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

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Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

(S-1) × rotor input
(1-S) × rotor input
S × rotor input
(1+S) × rotor input

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