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Electrical Machines

Electrical Machines
Maximum power developed depends on

 both 1and 2
 reactance
 load angle
 voltage

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Electrical Machines
Use of fractional pitch winding

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

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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

  2.73 KW.
 1.644 KW.
 5.46 KW.
 0.9103 KW.

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid locking of the armature.
All of these
 to avoid over heating.
 to achieve a stronger magnetic field.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Multiple voltage control.
 Field control.
 Armature control.
 Ward-Leonard control.

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MORE MCQ ON Electrical Machines

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