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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 DC generator
 AC generator
 DC motor
 induction motor

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Electrical Machines
Speed of DC motor can be controlled by varying

 all of these.
 its flux oer pole.
 resistance of armature culture.
 applied voltage.

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Electrical Machines
Regenerative braking is possible in

  DC shunt motor with field weakening control.
 DC compound motor.
 DC shunt motor with armature resistance control.
 DC series motor.

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Electrical Machines
Transformer action requires a

 alternating electric flux.
 constant magnetic flux.
 increasing magnetic flux.
 alternating magnetic lux.

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Electrical Machines
Armature of DC machine is made of

 conducting material.
 insulating material.
 silicon steel.
 non-ferrous material.

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

  66.91 V.
 76.91 V.
 86.91 V.
 56.91 V.

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MORE MCQ ON Electrical Machines

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