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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 70° to 85°
 0°
 25° to 30°

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 25 W.
 36 W.
 28 W.
 30 W.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 presence of commutator.
 armature reaction.
 high resistance of carbon brushes.
  reactance voltage.

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 18.18% increase
 36.36% decrease
 36.36% increase
 36.36% increase

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Electrical Machines
Poles of DC machine are often laminated to

 reduce pulsation loss.
 reduce iron weight.
 dissipate more heat.
 reduce armature reaction.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  √Ia.
  1/Ia.
  Ia2.
  Ia.

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