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8. A 500-V, d.c. shunt motor has armature and field resistances of 0.5 2 and 200 2 respectively. When loaded and taking a total input of 25 kW, it runs at 400 r.p.m. Find the speed at which it must be driven as a shunt generator to supply a power output of 25 kW at a terminal voltage of 500 V. [442 r.p.m.]

8. A 500-V, d.c. shunt motor has armature and field resistances of 0.5 2 and 200 2 respectively. When loaded and taking a total input of 25 kW, it runs at 400 r.p.m. Find the speed at which it must be driven as a shunt generator to supply a power output of 25 kW at a terminal voltage of 500 V. [442 r.p.m.]

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
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8. A 500-V, d.c. shunt motor has armature and field resistances of 0.5 Q and 200 2 respectively. When loaded and taking a total input of 25 kW, it runs at 400 r.p.m. Find the speed at which it must be driven as a shunt generator to supply a power output of 25 kW at a terminal voltage of 500 V. [442 r.p.m.] 9. A d.c. shunt motor runs at 900 r.p.m. from a 400 V supply when taking an armature current of 25 A. Calculate the speed at which it will run from a 230 V supply when taking an armature current of 15 A. The resistance of the armature circuit is 0.8 Q. Assume the flux per pole at 230 V to have decreased to 75% of its [595 r.p.m.] value at 400 V. 10. A shunt machine connected to 250-A mains has an armature resistance of 0.12 Q and field resistance of 100 2. Find the ratio of the speed of the machine as a generator to the speed as a motor, if line current is 80 A in both cases. [1.08] (Electrical Engineering-II, Bombay Univ. April. 1977, Madras Univ. Nov. 1978)
Transcribed Image Text:8. A 500-V, d.c. shunt motor has armature and field resistances of 0.5 Q and 200 2 respectively. When loaded and taking a total input of 25 kW, it runs at 400 r.p.m. Find the speed at which it must be driven as a shunt generator to supply a power output of 25 kW at a terminal voltage of 500 V. [442 r.p.m.] 9. A d.c. shunt motor runs at 900 r.p.m. from a 400 V supply when taking an armature current of 25 A. Calculate the speed at which it will run from a 230 V supply when taking an armature current of 15 A. The resistance of the armature circuit is 0.8 Q. Assume the flux per pole at 230 V to have decreased to 75% of its [595 r.p.m.] value at 400 V. 10. A shunt machine connected to 250-A mains has an armature resistance of 0.12 Q and field resistance of 100 2. Find the ratio of the speed of the machine as a generator to the speed as a motor, if line current is 80 A in both cases. [1.08] (Electrical Engineering-II, Bombay Univ. April. 1977, Madras Univ. Nov. 1978)
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