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Question 3) (4.5 marks) A 4-pole series d.c. motor runs at 600 r.p.m. on full load taking 25 A at 450 V. The armature is lap-

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- Given: Y = 450V = Voltage Supply I, >254 = motor current Z- 500 No. of Conductors p=4 = No. of Poles . $ = (107+10° 1°•5) w[Tao I al 14.16 10.5 *Iaz - 14 10 & Tools & Ias 4 (0-5+1) taz Dan25 7 Iaz z os Toj - (62.5)** Tag = 15749 11 From Rough Sketch, Ia to find we need RseFrom case i), Vi - In, Rse + Ebi we know that, ) 500 * 600 * (1-74107 * l1*10 * 25 Eb, ZNØ Fb A - 60 x 4 EP24 , since lap wi- Now, case Eb2 = V₂ - Iaz Rse for second En ef - Jaz (13-15) Fby 450 - (15,79)(13-15) Es = 7,88 Y Now, from Emf Equation, EM

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