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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 100
 10
 1

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Electrical Machines
Rotating part of DC motor is known as

 Armature.
 Pole.
 Starter.
 Carbone brush.

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Electrical Machines
Hysteresis loop represents the area of

 hysteresis loss
 total iron losses
 copper loss
 eddy current loss

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  split phase.
  capacitor start.
  capacitor run.
  shaded pole type.

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 8+j13 ohms
 3.05+j5.08 ohms
 3.5+j5.8 ohms
 53+j85 ohms

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 40%
 60%
 38%
 68%

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