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Synchronous Motors

Synchronous Motors
The shaft of synchronous motor is made of

Stainless steel
Mild steel
Chrome steel
Alcino

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Synchronous Motors
The net armature voltage of a synchronous motor is equal to the

arithmetic difference of Eb and V
arithmetic sum of Eb and V
vector sum of Eb and V
vector difference of Eh and V

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Synchronous Motors
A synchronous motor is cheaper than 3-phase induction motor for _____

High speed, high output
None of the listed here
Low speed, high output
High speed, low output

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Synchronous Motors
The direction of rotation of a synchronous motor can be reversed by reversing,

None of the listed here
Supply phase sequence
Polarity of rotor poles
Current to field winding

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Synchronous Motors
A synchronous machine with low value short circuit ratio has

Lower stability limit
High stability limit
Good voltage regulation
Good speed regulation

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Synchronous Motors
Leading power factor synchronous motors cost ______ the unity pf motors.

About the same as
Less than
More than
None of the listed here

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