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Electrical Machines

Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 45 ppm.
 20 ppm.
  35 ppm.
 25 ppm.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 234.76 N-m.
 133.22 N-m
 266.20 N-m.
 cant be determined.

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Electrical Machines
In DC generator, the electricity produced in armature is

  armature is not present in DC generator.
  DC.
  AC.
None of these

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  cheaper in cost.
  of low resistivity.
  lighter in weight.
  easy to cast owing to its low melting point and is easily available.

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Vacuum.
  Oil impregnated paper.
  Glass.
  Mica.

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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are

 1 , 3, 5
 1, 4,5
 2, 4, 5
 2, 3, 5

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