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ELECTRICAL MACHINES

Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of a dc machine.
 rotor of an synchronous machine.
 stator of a induction machine.
 stator of a dc machine.

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Electrical Machines
Which of the following motor has negative speed regulation?

 Cumulative compound motors
 Differential compound motor
 Shunt motor
 Series motor

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 full wave controlled
 half wave
 full wave
 half wave controlled

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

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

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Electrical Machines
Dynamic braking can be used for

All of these
 shunt motors.
 compound motors.
 series motors.

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