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Electrical Machines

Electrical Machines
Which of the following relation is correct?

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

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 generation of voltage.
 commutation.
 development of torque.
 electromechanical energy conversion.

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 maximum
 zero
 minimum
All of these

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Electrical Machines
Swinburne's test is applicable to

 DC series motor.
 DC Shunt motor.
 DC compound motor.
 DC shunt and level Compound motor.

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Electrical Machines
Rotating part of DC motor is known as

 Armature.
 Starter.
 Carbone brush.
 Pole.

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Electrical Machines
Armature reaction depends on which of the following?

 power factor of load
 magnitude of load current
 both 1 and 2
None of these

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