EXAMPLE 5.5 A 240-kW, 240-V, 6-pole, 600-rpm, separately excited generator is delivering the rated load at the rated voltage. The generator has R, = 0.01 2, Rf = 30, V, = 120 V, N, = 500 turns per pole, and P, = 10 kW. The demagnetizing mmf due to armature reaction is 25% of the armature current. Its magnetization curve is given in Figure 5.21. Determine (a) the induced emf at full load, (b) the power developed, (c) the torque developed, (d) the applied torque, (e) the efficiency, (f) the external resistance in the field winding, and (g) the voltage regulation. The separately excited generator of Example 5.5 is operating at no load with maximum field current. What is the induced emf in the armature? If it is loaded gradually until it supplies the rated load, what is the terminal voltage? What is the voltage regulation? Also calculate its efficiency and the applied torque.