8. What conditions must be fulfilled for the self-excitation of a d.c. shunt generator? The open-circuit characteristic of a shunt-excited d.c. machine, run at 1200 rev/min, is: Terminal voltage (V) Field current (A) 47 85 103 114 122 127 135 141 0-2 0-4 0-6 0-8 1-0 1-2 1-6 2-0 The field coil resistance is 55 Q. Determine: (i) the value of the field-regulating resistance to enable the machine to generate 120 V on open circuit when run at 1200 rev/min; (ii) the value of the open-circuit voltage when the regulator is set to 20 2 and the speed is reduced to 800 rev/min,

8. What conditions must be fulfilled for the self-excitation of a d.c. shunt generator? The open-circuit characteristic of a shunt-excited d.c. machine, run at 1200 rev/min, is: Terminal voltage (V) Field current (A) 47 85 103 114 122 127 135 141 0-2 0-4 0-6 0-8 1-0 1-2 1-6 2-0 The field coil resistance is 55 Q. Determine: (i) the value of the field-regulating resistance to enable the machine to generate 120 V on open circuit when run at 1200 rev/min; (ii) the value of the open-circuit voltage when the regulator is set to 20 2 and the speed is reduced to 800 rev/min,

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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(U.E.L, 0.2) 9. A shunt generator on test is separately excited and driven at 1000 rev/min. The open-circuit test figures are as follows: 0 0157 0477 0 663 0-805 1-0 1-29 12-5 100 300 400 450 500 550 Field current (A) Induced e.m.f. (V) The machine is then shunt-connected and run at 1000 rev/min with a constant field-circuit resistance of 540 , The armature-circuit resistance is 1 0. Deduce and plot the load characteristic of this machine, neglecting the effect of armature reaction. What is the ap- proximate value of the maximum load current? 0. The open-circuit charact
8. What conditions must be fulfilled for the self-excitation of a d.c. shunt generator? The open-circuit characteristic of a shunt-excited d.c. machine, run at 1200 rev/min, is: Terminal voltage (V) Field current (A) 47 85 103 114 122 127 135 141 0-2 0-4 0-6 0-8 1-0 1-2 1-6 2:0 The field coil resistance is 55 0, Determine: (i) the value of the field-regulating resistance to enable the machine to generate 120 V on open circuit when run at 1200 rev/min; (ii) the value of the open-circuit voltage when the regulator is set to 20 N and the speed is reduced to 800 rev/min. (U.E,I, Q.2)
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