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

 PZL/ 4Sa
 PZL/4S
 PZL/4Sp²
 PZL/4Sa²

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Electrical Machines
Flashing the field of DC generator means

  making the magnetic losses forces parallel.
 increasing flux density by adding extra turns of winding.
  creating residual magnetism by a DC source.
  neutralising residual magnetism.

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Electrical Machines
Which is the arrangement of windings in a core type single phase transformer?

 Half hv inside and half lv outside on each core limb
 Sandwiched lv and hv discs on each core limb
 Half lv inside and half hv outside on each core limb
 Lv on one core limb and hv on the other

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