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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 0.1 Ω
 100 Ω
 50 Ω
 10 Ω

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Electrical Machines
Transformer cooling and insulating oil must be of

  low viscosity.
 high viscosity.
 low BDV.
 low resistivity.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4Sa²
 PZL/ 4Sa
 PZL/4S
 PZL/4Sp²

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Electrical Machines
The heat transfer by convection in a transformer least depends on

 surface area.
 temperature difference.
 air velocity.
  color of the paint.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 proportionate to MVA rating of transformers.
  same.
 such that actual impedance of all transformers would be same.
 inversely proportional to MVA rating of transformers.

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Electrical Machines
Diverters are used only in

 series motors
 shunt motors
 either of these
None of these

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