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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 speed
 both A and B
 flux (φ)
 armature current (I)

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

 Increase in weight/KVA.
  Decrease in weight/KVA.
 Reduced copper loss.
 Reduced iron loss.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 increase.
 decrease.
 either of these.
None of these

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

 0°
 90°
 70° to 85°
 25° to 30°

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Electrical Machines
Use of fractional pitch winding

  results in reduced axial length of the machine.
  results in reduced leakage reactance.
All of these
  make it stiffer.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

All of these
 In order to get more flux.
 In order to not to get saturated.
 In order to get saturated.

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