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Electrical Machines

Electrical Machines
Eddy current loss will depends on

 Flux density
All of these
 Thickness
 Frequency

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  1440 to 2880.
  500 to 720.
  375 to 500.
  720 to 920.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Multiple voltage control.
 Ward-Leonard control.
 Field control.
 Armature control.

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

  33.33 Amp.
 29 Amp.
  43 Amp.
 44.47 Amp.

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

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

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 copper loss.
 vibrations.
 hysteresis loss.
 eddy electric current loss.

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MORE MCQ ON Electrical Machines

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