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Electrical Machines

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

 20 ppm.
  35 ppm.
 25 ppm.
 45 ppm.

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Electrical Machines
Methods of synchronizing of alternator may be done by

 all dark lamp method.
  all of these.
 all bright lamp method.
 one dark two bright.

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.02 pu.
  0.08 pu.
 0.01 pu.
 0.16 pu.

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Electrical Machines
The back emf produced in a dc motor depends on

  P and Z.
  Z.
  none of these.
  P.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 leakage reactance.
 percentage impedance.
 efficiency.
 rating.

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Any of above.
 Armature voltage control.
 Armature resistance control.
 Shunt field resistance control.

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