PROBLEM-

A 50-HP DC motor operates from a 220Volt DC source

With Power Loss 3,350 w rated at full-load conditions.

The speed at full-load is 1150 rpm.

the speed without Load is 50 rpm more.

Find:

a) The Source Current

b) The efficiency of the motor under full-load.

c) The speed regulation

d) Any comments on efficiency and speed regulation?

Are they suppose to be where theory says to be?