(Solved): 4. A 240-kW, 240-V, 6-pole, 600 rpm, separately excited generator is delivering the rated load at r ...

4. A 240-kW, 240-V, 6-pole, 600 rpm, separately excited generator is delivering the rated load at rated voltage. The generator has R? = 0.01 2, Rw = 30 2, V 120 V, N500 turns per pole, and P, = 10 kW. The demagnetizing mmf due to the armature reaction is 25% of the armature current. The magnetizing curve is given in Fig. P3.1 (a) Draw the schematic diagram of the generator. (b) Determine the induced emf at full load. (e) Determine the power developed. (d) Determine the torque developed. (e) Determine the applied torque. (f) Determine the efficiency. (g) Determine the external resistance in the field winding. (h) Determine the voltage regulation. Induced emf (V) 400 360 320 280 240 200 160 120 80 40 0 0 1 2 3 4 5 6 7 8 9 Field current (1) Fig. P3.1 10