Question

A dc shunt machine when runs as a motor on no load takes 440w and runs at 1000r.p.m .the field current and armature resistance are 1a and 0.5 om respectively . calculate the efficiency of the. machine when running as a generator delivering 40 a at 220 v and as a motor taking 40 a from a 220 v supply

Answer 1

p=440w v=220v i=40a hope this helps