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(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)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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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).
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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