Assume that the separately excited dc machine given in Examp

Assume that the separately excited dc machine given in Example 8.3 is being used as a separately excited shunt motor to drive a mechanical load. Its terminal voltage is kept constant at 200 V. The full-load current of the machine is 100 A as before. Its field current is kept variable at 1.0, 1.5, and 2.5 A by using the field rheostat. For each value of the field current, determine the following: (a) The developed torque at a full load of 100 A. (b) The developed power at a full load of 100 A. (c) The ideal no-load speed in rpm. (d) The full-load speed in rpm. (e) Sketch the torque–current characteristic based on the results found in Part (a). (f) Sketch the speed–current characteristic based on the results found in Parts (c) and (d).

Solution

V=200volts

I=100amps

If=1amp

We know v=Eb+Ia*Ra

Here Ra=0 ohms

So, v=Eb=200 volts.

Power developed=Eb*I=200*100=20,000 watts.

So, the remaining problem is not continuing because armature resistance is not given.

So please send value of armature resistance.