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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

  40 A.
 44 A.
 440 A.
 400 A.

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.72.
 0.62.
 0.25.
 1.24.

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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

 an inductor.
 A capacitor.
  None of these.
 A resistor.

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 direct axis and interpolar axis
 direct axis and indirect axis
 quadrature axis and interpolar axis
 quadrature axis and direct axis

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 not suitable for rapidly changing loads.
 none of above.
 constant speed.
 less expensive.

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 800W, 1600W
 1400W, 1000W
 1000W , 1400W
 1600W, 800W

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