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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd < Xq.
 Xd > Xq.
None of these
 Xd = Xq.

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 V²
 1/V²
 1/V
 supply voltage V

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Electrical Machines
The function of field regulator in a DC compound motor is to

 none of above.
 limit the armature current.
 control field current.
 vary the armature resistance.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Multiple voltage control.
 Field control.
 Ward-Leonard control.
 Armature control.

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

All of these
 power factor and dc excitation at constant load
 supply voltage and field current at constant excitation
 power factor and supply voltage during hunting

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Electrical Machines
Which of the following statements is/are correct ?

None of these
 Inter pole winding will act in interpolar region.
 Compensating winding will act under the pole.
 Both A and B.

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