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Three Phase Induction Motors

Three Phase Induction Motors
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

2 Hz
50 Hz
20 Hz
200 Hz

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Three Phase Induction Motors
In induction motor, percentage slip depends on

Supply voltage
None of these
Copper losses in motor
Supply frequency

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

Carbon steel
Stainless steel
High speed steel
Cast iron

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Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Series
Commutator
Slip ring
Synchronous

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

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

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Three Phase Induction Motors
The starting torque of a 3-phase induction motor is _______ supply voltage.

Independent of
Directly proportional to
Directly proportional to sqaure of
None of the listed here

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