A d.c. shunt generator, runs at 1200 r.p.m. When the machine is driven at rated speed, the no-load saturation curve is shown below. What will be the e.m.f generator, If the field rheostat is adjusted to give a field current of 2.5 A and the machine is driven at 1050 r.p.m when the load current is at the rated value? * Armature voltage (V): 6 32 78 105 127 140 143 146 148 Field current (A) : 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 O 160V 122.5V O 111.125V O 145.142V

A d.c. shunt generator, runs at 1200 r.p.m. When the machine is driven at rated speed, the no-load saturation curve is shown below. What will be the e.m.f generator, If the field rheostat is adjusted to give a field current of 2.5 A and the machine is driven at 1050 r.p.m when the load current is at the rated value? * Armature voltage (V): 6 32 78 105 127 140 143 146 148 Field current (A) : 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 O 160V 122.5V O 111.125V O 145.142V

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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6 shunt generators are running in parallel in a curtain generating station. Each generator supplies a load current of 500 A at 220 V. The shunt field current of each generator is 5 A and the armature resistance of each machine is 0.05 ohm. If one generator is suddenly switched off determine the percentage change in terminal voltage, the total load current being kept uncharged. A: 3%-2%
Calculate the voltage at the terminals of the generator and the voltage at the feeder in a dc series generator is supplying a current of 8.5 A to a load through a feeder of total resistance, 1.25 ohm. The generated voltage is 480 volts. The armature and series field resistances are 0.35 and 0.48 ohms respectively.
A 230V shunt generator has an armature circuit resistance of 0.05 ohms and shunt field resistance of 57.5 ohms. When the generator operates at rated voltage it has a total core and mechanical losses of 1880W. At what load does the generator operate so as to achieve maximum efficiency?
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A 2-pole d.c. shunt generator has a useful flux per pole of 0.03 Wb. The armature winding consist of 200 turns, each of 0.005 Ω resistance. Calculate the terminal voltage when running at 1200 r.p.m. if the armature current is 40A.
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(B)-ndicate whether the following statements are true or false and correct the faise statements. -When a series d.c. motor is operate without load, the armature will not run. The strength of magnetic field in d.c. shunt generator can be varied by varying the polarity of the field poles The main disadvantage of series generators is Output voltage varies as the Toad varies There is no output from the transformer under short-circuit conditions
with full steps please.