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A separately excited DC generator has terminal voltage 250V with constant field excitation. If the load changes from 200KW to 125KW, find percentage reduction

A separately excited DC generator has terminal voltage 250V with constant field excitation. If the load changes from 200KW to 125KW, find percentage reduction in speed. The armature resistance is 0.015 and total contact drop at brushes is 2V. Neglect the armature reaction. The flux & total number of armature conductors remain constant. Ans.

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