A separately excited DC generator has rated terminal voltage and full load armature current of 200 V and 50 A respectively and rated speed of 1500 rpm. The generator armature resistance R, = 0.1 Q and field resistance of R, = 1000 and field voltage of 150 V. Calculate: 1. The induced emf and torque at full load. 2. The emf, armature current and terminal voltage at rated speed when the field voltage is changed to 100V. 3. The developed torque at rated speed when the field voltage is changed to 120V. 4. The emf, armature current and terminal voltage at half rated speed when the field voltage is changed to 200V.

A separately excited DC generator has rated terminal voltage and full load armature current of 200 V and 50 A respectively and rated speed of 1500 rpm. The generator armature resistance R, = 0.1 Q and field resistance of R, = 1000 and field voltage of 150 V. Calculate: 1. The induced emf and torque at full load. 2. The emf, armature current and terminal voltage at rated speed when the field voltage is changed to 100V. 3. The developed torque at rated speed when the field voltage is changed to 120V. 4. The emf, armature current and terminal voltage at half rated speed when the field voltage is changed to 200V.

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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Question

A separately excited DC generator has rated terminal voltage and full load armature current of
200 V and 50 A respectively and rated speed of 1500 rpm. The generator armature resistance R,
= 0.1 Q and field resistance of R; = 1000 and field voltage of 150 V.
Calculate:
1. The induced emf and torque at full load.
2. The emf, armature current and terminal voltage at rated speed when the field voltage is
changed to 10ov.
3. The developed torque at rated speed when the field voltage is changed to 120V.
4. The emf, armature current and terminal voltage at half rated speed when the field
voltage is changed to 200V.

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