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Three Phase Induction Motors

Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

None of the listed here
1+S
1-S
S-1

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

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Three Phase Induction Motors
The low power factor of induction motor is due to

All of these
Stator reactance
The reactive lagging magnetizing current necessary to generate the magnetic flux
Rotor leakage reactance

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

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

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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
High reactance
high resistance
Low resistance

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Three Phase Induction Motors
An induction motor is so called because its operation depends on

Mutual induction
Eddy currents
Hysteresis
Self induction

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