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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 115 V.
 200 V.
 460 V.
 230 V.

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Electrical Machines
The armature of a DC motor is laminated to reduce

 friction and windage loss.
 copper loss.
 eddy current loss.
 hysteresis loss.

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Gross power.
 Power drawn in KW.
 Output power at the shaft.
 Power drawn in KVA.

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Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / V2
 (E2 - V2) / E2
 (V2 - E2) / E2
 (V2 - E2) / V2

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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 lap-winding ?

 PZL/4SP²
 PZL/4Sa²
 PZL/ 4Sa
 PZL/4S

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Electrical Machines
The slot edges in a DC machine are made of

 Cast iron.
 Silicon steel.
 Mild steel.
  Fibre.

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