ETO ETO Exam papers 📅 Aug 2023

Exam Question

(a) Explain distribution factor and pitch factor for alternator windings. (6)

(b) An eight-pole armature is wound with 480 conductors. The magnetic flux and the speed are such that the average e.m.f. generated in each conductor is 2.2 V, and each conductor is capable of carrying a full load current of 100 A. Calculate the terminal voltage on no load, the output current on full load and the total power generated on full load when the armature is: (10)

(i) Lap-connected

(ii) Wave-connected

Reference Answer

(a) Distribution Factor (Kd):
The distribution factor is a measure of how the EMF induced in a distributed winding compares to the EMF induced if the winding were concentrated in one slot. It is given by the formula:
$$K_{d}=\frac{EMF\:induced\:in\:distributed\:windings}{EMF\:induced\:in\:concentrated\:windings}$$
Concentrated Winding : All the coils of a phase under one pole are grouped in a single slot.

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