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Electrical Machines

Electrical Machines
Example of double excited machine is

 Synchronous motor.
 Both are correct.
None of these
 DC Shunt Motor

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cosδ
 cos2δ
 sinδ
 sin2δ

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imax
 Vmax to Imin
 Vmax to Imax
 Vmin to Imin

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to achieve a stronger magnetic field.
All of these
 to avoid over heating.
 to avoid locking of the armature.

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Electrical Machines
Which of the following is the largest conversion device?

 Synchronous machine
 DC machine
All of these
 Induction machine

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
 remains same.
 decreases.
None of these

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