2. A d.c. shunt generator gave the following open-circuit characteristicwhen driven at 750 r.p.m.Field current, A :0.511.522.5E.m.f., V:5084105120 131(i) If the machine is run as a shunt generator at 750 r.p.m., to whatvoltage will it excite with shunt field resistance equal to 70 N?(ii) What is the critical value of shunt field resistance?(iii) What is the critical speed when the shunt field resistance is 70 2?(iv) With shunt field resistance equal to 55 N, what reduction in speed bemade to make the open-circuit voltage equal to 100 V?

2. A d.c. shunt generator gave the following open-circuit characteristic when driven at 750 r.p.m. Field current, A : 0.5 1 1.5 2 2.5 E.m.f., V : 50 84 105 120 131 (i) If the machine is run as a shunt generator at 750 r.p.m., to what voltage will it excite with shunt field resistance equal to 70 2? (ii) What is the critical value of shunt field resistance? (iii) What is the critical speed when the shunt field resistance is 70 2? (iv) With shunt field resistance equal to 55 2, what reduction in speed be made to make the open-circuit voltage equal to 100 V?

2. A d.c. shunt generator gave the following open-circuit characteristic when driven at 750 r.p.m. Field current, A : 0.5 1 1.5 2 2.5 E.m.f., V : 50 84 105 120 131 (i) If the machine is run as a shunt generator at 750 r.p.m., to what voltage will it excite with shunt field resistance equal to 70 2? (ii) What is the critical value of shunt field resistance? (iii) What is the critical speed when the shunt field resistance is 70 2? (iv) With shunt field resistance equal to 55 2, what reduction in speed be made to make the open-circuit voltage equal to 100 V?

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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Concept explainers

DC Generator

An electromechanical machine which converts input mechanical energy to respective output electric energy is called a generator.

Question

2. A d.c. shunt generator gave the following open-circuit characteristic
when driven at 750 r.p.m.
Field current, A :
0.5
1
1.5
2
2.5
E.m.f., V
:
50
84
105
120 131
(i) If the machine is run as a shunt generator at 750 r.p.m., to what
voltage will it excite with shunt field resistance equal to 70 N?
(ii) What is the critical value of shunt field resistance?
(iii) What is the critical speed when the shunt field resistance is 70 2?
(iv) With shunt field resistance equal to 55 N, what reduction in speed be
made to make the open-circuit voltage equal to 100 V?

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