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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

 magnetization
 demagnetization
All of these
 cross magnetization

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

 Shaded pole type.
 Capacitor start.
  Capacitor run type.
 Split phase type.

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

None of these
 will become leading
 will remain the same
 will become lagging

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Auxiliary winding.
 Both Compensating and Commutating pole winding.
 Commutating pole winding.
 Compensating winding.

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

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

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Electrical Machines
In synchronous generator V curve is drawn between

 either of these.
 field current on X-axis and power factor on Y-axis.
 field current on X-axis and armature current on Y-axis.
 field current on Y-axis and armature current on X-axis.

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