上午11:58 6月17日周五 Question 11 NOTE: The workings of this question must be included in the PDF file to be uploaded at the e

[answerhappygod]

1 (78.41 KiB) Viewed 23 times

上午11:58 6月17日周五 Question 11 NOTE: The workings of this question must be included in the PDF file to be uploaded at the end of the exam. Be organised and specify the question and subquestion number. 12pt ✓ Take Quiz A generating unit was supplying 150 MW at 0.95 power factor lagging at its rated voltage. The reactance of the generator is 0.9 per unit on a 200 MVA basis. The field current of the generator is now increased by 25% and the torque applied by the prime mover to the shaft of the generator is held constant. Using 4 decimal places: I. Calculate the magnitude (in per unit) and angle of the new e.m.f. Assume a linear relation between the field current and the magnitude of the internal e.m.f. of the generator. [3 pts] II. Calculate the active and reactive power (in per unit) now delivered by this generator. Finally, calculate the corresponding power factor. [4 pts] You must leave the text box below blank. Paragraph B I U Αν 7 pts T² v 100% Exit