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Electrical Machines

Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 9/16.
 16/9.
 3/4.
 4/3.

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 100 ohm
 0.2 ohm
 2 ohm.
 10 ohm

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 1000.
 500.
 0.
 2000.

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Electrical Machines
Open circuit test on transformer gives

 both 1and 2
 hysteresis loss
 eddy current loss
 copper loss

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Electrical Machines
Under commutation results in

  no sparking.
  sparking the trailing edge of the brush.
  sparking at the middle of the brush.
  sparking at the leading edge of the brush.

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

  66.91 V.
 86.91 V.
 56.91 V.
 76.91 V.

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