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Electrical Machines

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

 flat-topped
 co- sinusoidal
 sinusoidal
 rectangular

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.02 pu.
 0.16 pu.
 0.01 pu.
  0.08 pu.

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Electrical Machines
Demagnetization effects which of the following?

 both B and C
 commutation
 reduces the terminal voltage
 reduction in main field flux

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Electrical Machines
Compensating winding is placed in the

 pole shoe
 armature core
 main field
All of these

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 dielectric losses.
 core losses.
 stray losses.
 copper losses.

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of parallel paths.
  number of pole pairs.
  number of poles.
  number of commutator segments.

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