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Three Phase Induction Motors

Three Phase Induction Motors
The term cogging is associated with

Three phase transformer
Compound generators
Dc series motors
Induction motors

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Three Phase Induction Motors
Slip rings are usually made of

Aluminium
Copper
Carbon
Phospor bronze

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Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

1-S
1/S
S
S/1-S

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Three Phase Induction Motors
A wound rotor motor is mainly used in applications where ______

High rotor resistance is required during running
Less costly motor is not required
High starting torque is required
Speed control is required

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Three Phase Induction Motors
Very large 3-phase induction motors (greater than 25 HP) are started _____

Direct on line
Star-delta starting
By auto transformer starting
None of the listed here

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

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