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Three Phase Induction Motors

Three Phase Induction Motors
The stator of a three phase induction motor produces _______ magnetic field.

Steady
Alternating
None of the listed here
Rotating

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Three Phase Induction Motors
The shape of the torque/slip curve of induction motor is

Straight line
Rectangular parabola
Parabola
Hyperbola

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

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

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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

Bigger
Smaller
Same
Any of the listed here

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Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

None of the listed here
Greater than
Smaller than
Equal to

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Three Phase Induction Motors
A 3 phase induction motor is ________

Very costly
A variable speed motor
Not easily maintainable
Essentially a constant speed motor

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