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2S QUESTION 3 (a) In the direct-current (d.c.) generator shown in Figure 03.1, (i) ?, is the useful flux per pole, (ii)N, is the speed of the armature in revolutions per minute (rpm), (ii) p is the number of pole-pairs/pairs of poles, (iv) Z is the total number of conductors on the armature and (v) c is the number of parallel paths through the winding between the positive and the negative brushes. From first principles and in not less than seven (7) steps and using only the quantities given above (in the final equation), derive the electromotive force (e.m.f.) equation of the machine (i.e. the equation of the generated voltage in the generator) Field wieding Shaft Armatare conductons Pole core Pole show Frame or yoke (6.0 marks) Figure Q3.1. D.C. machine of Question 3(a).

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