22. The magnetization curve for a separately excited dc generator is shown in Figure P8-7....

22. The magnetization curve for a separately excited dc generator is shown in Figure P8-7. The generator is rated at 6 kW, 120 V, 50 A, and 1800 r/min and is shown in Figure P8-8. Its field circuit is rated at 5A. The following data are known about the machine:

Answer the following questions about this generator, assuming no armature reaction.

(a) If this generator is operating at no load, what is the range of voltage adjustments that can be achieved by Radj?

(b) If the field rheostat is allowed to vary from 0 to 30 and the generator's speed is allowed to vary from 1500 to 2000 r/min, what are the maximum and minimum no-load voltages in the generator?

560 ELECTRIC MACHINERY FUNDAMENTALS