Q2/ The open circuit characteristic of seperataly excited de generator driven at 1000 rpm is asfollows:Field current1234565.566.5E.M.F volt50 6080100120150160170For this generator find:1- No load voltage for the total shunt field resistance of 10002.2- The critical resistance at 1000 rpm3- The open circuit curve at 800 rpm and therfrom the open circuit voltage for a field resistanceof 8002(35 mark)

Step 1:Given DataGenerator speed: 1000 rpmField current (If) and corresponding EMF (E):Field…

Answered: Q2/ The open circuit characteristic of…

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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Similar questions

A 6 pole wave wound d.c. shunt generator has 500 conductors. A generator delivers 50 kW of power at 250 voltage at full load. The resistance of the field circuit is 125 2. Actual brush shift is 10°. Then find the demagnetizing and cross magnetizing ampere turns per pole and how many additional turns must be wound on each pole to eliminate the demagnetizing effect.
Q3/ A/ Compare between de series and shunt generator. Q3/ B/ Briefly explain the commutating process in dc machine.
Two shunt generators A and B operates in parallel and their load characteristicsmay be taken us straight lines. The voltage of the generator A falls from 240 V atno-load to 220 V at 200 A while that of B falls from 245 V at no load to 220 V at150 A. Determine the current which each machine supplies to a common load of300 A and the bus-bar voltage at this load.
al Power Technology A short-shunt d.c. compound generator supplies 250A at 50V. The resistance of armature, series field and shunt field windings are 0.02, 0.08 and 50 ohms respectively. Find the emf generated. The armature current la The generated voltage Eg An 8-pole d.c. generator has 455 armature conductors, and a useful flux of 44 mWb per pole. What will be the e.m.f. generated if it is lap-connected and runs at 1060 rpm? What must be the speed at which it is to driven produce the same e.m.f. if it is wave-wound?
A thicker wire is used in the DC series field winding than DC shunt field winding in DC machines. * O because it carries the load current. O to prevent mechanical vibrations. O to provide strength. O to produce large flux. The speed of a DC motor can be changed by varying - armature resistance circuit O flux per pole O voltage source O all of above
A short shunt compound generator supplies 100A at 110V. Armature resistance is 0.050 and the shunt field resistance is 570 and the series field of resistance is 0.042. if the SPL is 852, determine a)Eg b)Copper lossesin b.1)armature b.2)series b.3)shunt c)n
A 500 V, 250 kW, long shunt compound generator induces an e.m.f. of 480 V whenrunning at 1000 r.p.m. no load. On full load the spped of the machine drops to 975r.p.m. the flux increases by 15% and the terminal voltage rises to 500 V. If theseries and shunt field resistances are 0.02 ohm and 100 ohms respectively,calculate the armature resistance. Assume a voltage drop of 1V per brush.[Ans.
True False In self-excited DC generator, the residual flux is primary condition in e.m.f generation Answer by true or false * True False The flux of shunt wound DC generator induced during loading
the armature of a 12 pole wave wound dc shunt generator has 50 slots with 12 conductors per slot. the generatoris running at a speed of 625 rpm and supplies a resistive load of 15 ohm at a terminal voltage 350v. the armature and the field reisitance are0.5 ohm and 70 ohm respectively. find the armature current,generated emf and flux per pole
Two identical 2,000 kW alternator operates in parallel. The governor of the first machine is such that the frequency drops uniformly from 50 Hz at no-load to 48 Hz at full-load. The corresponding uniform speed drop of the second machine is 50 Hz to 47.5 Hz. What is the maximum load that can be delivered without overloading either machine?
6. The O.C.C. of a shunt generator when separately-excited and running at 1000 r.p.m. is given by : O.C.C. volt : 56 112 150 180 200 216 230 Field amp. : 0.5 1.0 1.5 2.0 2.5 3.0 3.5 If the generator is shunt-connected and runs at 1100 r.p.m. with a total field resistance of 80 2, determine (a) no-load e.m.f. (b) the output when the terminal voltage is 200 V if the armature resistance is 0.1 Q. (c) the terminal voltage of the generator when giving the maximum output current. Neglect the effect of armature reaction and of brush contact drop.
Q4/B/ What are the principal characteristics of a series DC motor? What are its uses? Core Mc

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