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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

 1
 100
 10
 50

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Electrical Machines
The torque developed in IM is nearly proportional to

  1 / V.
  V.
  V2.
 1 / V2.

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Electrical Machines
Generator works on the principle of production

 dynamically induced emf.
 both A and B.
 static induced emf.
None of these

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

  more than core loss.
 less than core loss.
 zero.
 equal to core loss.

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

 rectangular
 flat-topped
 co- sinusoidal
 sinusoidal

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  less than one.
  approx to one.
  very low
  greater than one.

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