(i) Plot the O.C.C. for 375 r.p.m. and determine the voltage to which the machine will excite if the field resistance is 40 Q. (ii) Determine the load current supplied by the generator when its terminal voltage is 200 V. Take armature resistance 0.3 Q. Assume speed to be constant and ignore armature reaction. (iii) What additional resistance would have to be inserted in the field circuit to reduce the voltage to 200 V at 375 r.p.m. (no-load).
(i) Plot the O.C.C. for 375 r.p.m. and determine the voltage to which the machine will excite if the field resistance is 40 Q. (ii) Determine the load current supplied by the generator when its terminal voltage is 200 V. Take armature resistance 0.3 Q. Assume speed to be constant and ignore armature reaction. (iii) What additional resistance would have to be inserted in the field circuit to reduce the voltage to 200 V at 375 r.p.m. (no-load).
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Question
DC machines
![The O.C.C. of a D.C shunt generator running at 300 r.p.m. is as follows.
It (A)
0 2 3
4
6.
7
5
E. (V)
7.5
92
132
160
183
190
212
(i) Plot the O.C.C. for 375 r.p.m. and determine the voltage to which the machine will
excite if the field resistance is 40 Q.
(ii) Determine the load current supplied by the generator when its terminal voltage is
200 V. Take armature resistance 0.3 Q. Assume speed to be constant and ignore
armature reaction.
(iii) What additional resistance would have to be inserted in the field circuit to reduce
the voltage to 200 V at 375 r.p.m. (no-load).
(Hint) Plot the O.C.C. at 375 r.p.m., increase the e.m.f. induced in the ratio (375/300).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9d7760e5-4d13-4ab1-b8da-6f04c56adeb5%2Fe1175d66-1aad-470b-af99-c07e4f69828b%2Fkuzxcmg_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The O.C.C. of a D.C shunt generator running at 300 r.p.m. is as follows.
It (A)
0 2 3
4
6.
7
5
E. (V)
7.5
92
132
160
183
190
212
(i) Plot the O.C.C. for 375 r.p.m. and determine the voltage to which the machine will
excite if the field resistance is 40 Q.
(ii) Determine the load current supplied by the generator when its terminal voltage is
200 V. Take armature resistance 0.3 Q. Assume speed to be constant and ignore
armature reaction.
(iii) What additional resistance would have to be inserted in the field circuit to reduce
the voltage to 200 V at 375 r.p.m. (no-load).
(Hint) Plot the O.C.C. at 375 r.p.m., increase the e.m.f. induced in the ratio (375/300).
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