Answered: The figure shows the excitation curve…

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

The figure shows the excitation curve (including residual voltage) of a 170 kW, 250 V DC shunt generator at rated speed of 850 rpm. The generator has negligible (0 W) armature resistance and a shunt field coil resistance of 50 W. The variable Field Control Rheostat in series with the shunt field coil has variable resistance in the range of 0 – 25 W.

Explain your reasoning for choosing the following answer.

What is the rheostat resistance settings when the induced voltage is 300 V and the generator is turning at 120% rated speed?

12.65 Ω
10.47 Ω
8.32 Ω
3.25 Ω
2.22 Ω

Magnetization Curve - 170 kW, 250V, 850 rpm DC Shunt
Generator
350
300
250
200
150
100
50
7
Field Current (A)
1
2
3
4
5 6
8
9
10
11
12
Induced emf - Eo (V)

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