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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 co- sinusoidal
 flat-topped
 sinusoidal

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

 10
 1
 100
 50

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Field excitaion.
  Armature current.
  Armature voltage.
  Supply voltage.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 electromechanical energy conversion
 development of torque
 commutation
 generation of voltage

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 armature circuit
 both A and B
 none of above
 shunt field

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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

 30 W.
 36 W.
 25 W.
 28 W.

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