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Three Phase Induction Motors

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

Flexible
Stiff
Any of the listed here
Hollow

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Three Phase Induction Motors
Friction and windage loss of a 3 phase induction motor are

None of the listed here
Remains the same at all loads
Maximum at no load
Minimum at no load

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

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

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Three Phase Induction Motors
Less maintenance troubles are experienced in terms of

None of the listed here
Squirrel cage induction motor
Both squirrel cage and slip ring
Slip ring induction motor

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

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

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Three Phase Induction Motors
Insertion of resistance in the rotor of an induction motor to develop a given torque

Decreases the rotor current
Rotor current becomes zero
Rotor current remains same
Increases the rotor current

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