A separately-excited DC generator with compensating windings (Fig. 1), that is, effects of armature reaction is negligible, rated at 10 kW, 100 V has a magnetization curve shown in Fig. 2. Assume generator is driven at 1600 RPM. The generator shown in Fig. 1 is rewired as a self-excited shunt DC generator and Radj adjusted to 10 Ω and generator speed is set at 1600 RPM. Ignoring the effects of armature reaction, answer the following questions: a. Assuming voltage buildup is successful, what is the no-load terminal voltage of this generator? (Answer in zero decimal places) b. If the generator is supplying 40 A to a load, what would be its terminal voltage in volts? (Answer in 2 decimal places). Note that your answer in Question A is your EA. c. What would be the total electrical losses in watts incurred by the generator in Question B? (Answer in zero decimal places) d. If mechanical losses in Question 6 is 500 watts, what is the efficiency of this generator in %? (Answer in 2 decimal places). Note that efficiency is equal to Pout/(Pout + Total losses) x 100 %
A separately-excited DC generator with compensating windings (Fig. 1), that is, effects of armature reaction is negligible, rated at 10 kW, 100 V has a magnetization curve shown in Fig. 2. Assume generator is driven at 1600 RPM.
The generator shown in Fig. 1 is rewired as a self-excited shunt DC generator and Radj adjusted to 10 Ω and generator speed is set at 1600 RPM. Ignoring the effects of armature reaction, answer the following questions:
a. Assuming voltage buildup is successful, what is the no-load terminal voltage of this generator? (Answer in zero decimal places)
b. If the generator is supplying 40 A to a load, what would be its terminal voltage in volts? (Answer in 2 decimal places). Note that your answer in Question A is your EA.
c. What would be the total electrical losses in watts incurred by the generator in Question B? (Answer in zero decimal places)
d. If
Step by step
Solved in 2 steps
