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Electrical Machines

Electrical Machines
Armature reaction of an unsaturated DC machine is

 demagnetising.
  none of above.
  magnetising.
  crossmagnetising.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Shunt Motor
 Compound Wound DC Motor
 DC Series Motor
 Separately Excited DC Motor

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  magnetic inertia.
  high field resistance.
  residual flux.
  high speed.

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Electrical Machines
Lap winding is prefered for which type of machines?

 high current and low voltage
 low current and low voltage
 high current and high voltage
 low current and high voltage

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Eddy current losses
 All of the them
 Friction and windage losses
 Hysteresis losses

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  magnetizing electric current and back emf.
  the rotating stator flux and rotor flux.
None of these
  the supply voltage and the back emf.

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