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Electrical Machines

Electrical Machines
Armature resistance control method is used for the _______ ?

 both 1 and 2
 below rated speed
None of these
 above rated speed

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Electrical Machines
Field weakening method is also called as-----------?

 constant power control
 constant voltage control
 constant current control
 constant torque control

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Electrical Machines
Slot wedges in a dc machine is made up of

 fibre.
 silicon steel.
 cast iron.
 mild steel.

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Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

 condition of bushing stud.
  condition of transformer.
 condition of transformer oil.
 condition of bushings.

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Electrical Machines
Use of fractional pitch winding

  make it stiffer.
All of these
  results in reduced axial length of the machine.
  results in reduced leakage reactance.

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Electrical Machines
A 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 efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 72.5%
 82.5%
 78.5%
 67.5%

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