The Hopkinson's test was performed at full load on two similar shunt machines. The test results are:
Line voltage = 110 V
Line current = 48 A,
Armative current = 230 A (motor)
Field currents = 3 A and 5 A
Armature resistance = 0.035 Ω (each)
Brush contact drop = 1 V per brush
Calculate the efficiency of both the machines.