1: A 6-pole dc machine has a hot armature winding resistance of 0.8Ω; the brush contact drops maybe assumed constant at 1.5 V. The OCC at 1400 rpm is given in table 5.1. dc machine is wave-wound with 46 coils and 3 turns/coil. The field winding has 630 turns/pole. the field windings resistance 250Ω; a) Plot the OCC at 1400 rpm. b) On the same sheet of part a, plot the OCC at 1600 rpm and at 1000 rpm. c) The machine is operated as a separately excited generator at 1400 rpm with the field current fixed at 1.2 A. It supplies a 15 Ω load resistor with 5 KW. Determine the demagnetizing effect of armature reaction as(i)a reduction in emf, and (ii)a reduction in effective field current.

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