A d.c. shunt machine generates 250-V on open circuit at 1000 r.p.m. Effective armature resistance is 0.5 ohm, field resistance is 250 ohm, input to machine running as a motor on no load is 4 A at 250 V. Calculate speed of machine as a motor taking 40 A at 250 V. Armature reaction weakens field by 4%

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DC Generator

An electromechanical machine which converts input mechanical energy to respective output electric energy is called a generator.