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Electrical Machines

Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  variable.
  constant.
  minimum.
  maximum.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature voltage control.
 Armature circuit resistance control.
 Field resistance control.
 Any of above.

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Electrical Machines
which of the following type of brush and their application is/are correct

 electro graphite → large ratings
All of these
 copper graphite → low voltage high current density
 carbon brush → normal ratings

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 168.75 W
 75 W
 50 W
 112.5 W

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both decrease
 both increase
 decrease and increase respectively
 increase and decrease respectively

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Electrical Machines
The output power of a dc motor is given by

  EIa.
  none of these.
  EbIa.
  EbIa2.

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