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Electrical Machines

Electrical Machines
Field weakening control method is used for the _________ ?

 both A and B
None of these
 below rated speed
 above rated speed

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction by slowly.
 it will run in same direction.
 it will run in opposite direction.
 motor will not run.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 Field current.
 Line current.
 Armature current.
 None of above.

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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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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  oscillation cannot be damped.
  maintaining constant excitation.
  running the motor on leading power factors.
  providing damper bars in the rotor pole faces.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor armature terminal.
 generator field terminal.
 generator armature terminal.
 motor field terminal.

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