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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 200 V
 460 V
 115 V
 230 V

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of field flux on the armature flux.
  Effect of armature flux on the main field flux.
None of these
 Effect of armature flux on the load.

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

 170.
 180.
  150.
 160.

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Triangular and directed towards main pole.
 Peaky in nature.
 Saddle shape.
 Triangular and directed towards brush axis.

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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 920 RPM
 940 RPM
 960 RPM
 970 RPM

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Electrical Machines
Transformer core is laminated to reduce

 copper loss.
 eddy current loss.
 hysteresis loss.
 both 1 and 2.

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