Q2: A 20 kW, 440-V, short-shunt, compound d.c. generator has a full-load efficiency of87%. If the resistance of the armature and interpoles is 0.4 2 and that of the series andshunt fields 0.25 Q and 240 Q respectively, calculate the combined bearing friction,windage and core-loss of the machine.

Answered: Image /qna-images/answer/2b752f8f-3a02-4421-9019-528a0ceb79c6.jpg

2: A 20 kW, 440-V, short-shunt, compound d.c. generator has a full-load efficiency of 7%. If the resistance of the armature and interpoles is 0.4 2 and that of the series and nunt fields 0.25 Q and 240 2 respectively, calculate the combined bearing friction, indage and core-loss of the machine.

2: A 20 kW, 440-V, short-shunt, compound d.c. generator has a full-load efficiency of 7%. If the resistance of the armature and interpoles is 0.4 2 and that of the series and nunt fields 0.25 Q and 240 2 respectively, calculate the combined bearing friction, indage and core-loss of the machine.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter11: Transient Stability

Section: Chapter Questions

Problem 11.3P

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Question

Q2: A 20 kW, 440-V, short-shunt, compound d.c. generator has a full-load efficiency of
87%. If the resistance of the armature and interpoles is 0.4 2 and that of the series and
shunt fields 0.25 Q and 240 Q respectively, calculate the combined bearing friction,
windage and core-loss of the machine.

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