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Three Phase Induction Motors

Three Phase Induction Motors
DOL starting of induction motors is usually restricted to

Variable speed motors
Low horsepower motors
High speed motors
High horsepower motors

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

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

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Three Phase Induction Motors
Size of a high speed motor as compared to low speed motor for the same HP will be

Any of the listed here
Smaller
Bigger
Same

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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
S-1
1-S
1+S

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Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

(1-S) × rotor input
(1+S) × rotor input
S × rotor input
None of the listed here

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Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

Partly star and partly delta
Delta
None of the listed here
Star

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