EXAMPLES1. Sketch neat graphs to show the internal or open-circuit characteristicsof a separately-excited d.c. generator. Why is a field regulator necessarywith such a machine?A four-pole d.c. generator gives 410 V on open circuit when drivenat 900 rev/min. Calculate the flux per pole if the wave-connectedarmature winding has 39 slots with 16 conductors per slot. 10219 wb(U.E.I.)2. A six-pole d.c. generator having a lap-connected armature winding isrequired to give a terminal voltage of 240 V when supplying an arma-ture current of 400 A. The armature has 84 slots and is driven at 700rev/min. The resistance of the armature circuit is 0-03 2 and the usefulflux per pole is about 0-03 Wb. Calculate the number of conductors perslot and the actual value of the useful flux per pole. 8- 0.0321 wb3. Explain why the terminal voltage of a d.c. shunt-excited generatorfalls as the current supplied by the machine is increased.The resistance of the field circuit of a shunt-excited d.c. generatoris 200 2. When the output of the generator is 100 kW, the terminalvoltage is 500 V and the generatcd e.m.f. 525 V. Calculate: (a) thearmature resistance, and (b) the value of the generated e.m.f. when theoutput is 60 kW, if the terminal voltage is then 520 V. 233 534.51(E.M.E.U.)4. A short-shunt compound generator has armature, shunt-field andseries-field resistances of 0-8 2, 45 N and 0-6 2 respectively and sup-plies a load of 5 kW at 250 V. Calculate the e.m.f. generated in thearmature. 282-665. The following table gives the open-circuit voltages for different fieldcurrents of a shunt generator driven at a constant speed:Terminal voltage (V)Field current (A)120 240 334 400 444 4700.5 1-0 1-5 2:0 2-5 3.0Plot a graph showing the variation of generated e.m.f. with excitingcurrent and from this graph derive the value of the generated e.m.l.When the shunt circuit has a resistance of (a) 160 Q, (b) 210 52 and (e)00 44, Also find the value of the critical resistance of the shunt circuit.

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EXAMPLES 7 1. Sketch neat graphs to show the internal or open-circuit characteristics of a separately-excited d.c. generator. Why is a field regulator necessary with such a machine? A four-pole d.c. generator gives 410 V on open circuit when driven at 900 rev/min. Calculate the flux per pole if the wave-connected armature winding has 39 slots with 16 conductors per slot. 10219 wb (U.E.I.) re winding is

EXAMPLES 7 1. Sketch neat graphs to show the internal or open-circuit characteristics of a separately-excited d.c. generator. Why is a field regulator necessary with such a machine? A four-pole d.c. generator gives 410 V on open circuit when driven at 900 rev/min. Calculate the flux per pole if the wave-connected armature winding has 39 slots with 16 conductors per slot. 10219 wb (U.E.I.) re winding is

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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