4.For a general DC generator, we aim to achieve constant output voltage at differentrotating speeds.(1) List two factors influencing the output voltage for a given DC generator.(2) How does the change of the load (assuming the load is the current flowing though the resistor)will impact on the generated voltage for (a) separately excited DC generator, (b) Shunt DCgenerator, and (c) cumulative compound DC generator?

Answered: Image /qna-images/answer/60c88253-9d38-46b3-b97f-a6d110bfddc3.jpg

Answered: 4. For a general DC generator, we aim…

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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1A. Which of the following is/are a method of providing field excitation for a DC generator. a) separately excited shunt b) self-excited series c) self-excited shunt d) all of the above 1B. Which type of field winding typically has the higher resistance? a) series b) shunt
B 1. Which of the following is/are a reason for the drop in terminal voltage of a separately excited generator as load is increased? a) eddy currents b) FR losses of the windings c) hystereisis d) all of the above B 2. Eddy currents are kept to a minimum in the pole cores of a DC machine by using latninated pole. as opposed to a solid pole core. a) true b) false B3. A self-excited DC shunt generator must have a residual magnetic field to begin with in order for it to build up to its rated terminal voltage. a) true b) false
Please solve this problem step by step and illustrate your answer properly. Write your answer in a piece of paper please. Box the final answer.
In a 220 V compound generator, the resistances of the armature, shunt and series windings are 0.09 ohms, 35 ohms and 0.06 ohms respectively. The load current is 150 A at 220 V. Find the induced e.m.f. and the armature current when the machine is connected as a. long-shunt and as b. short-shunt. How will the ampere- turns of the series field be changed in a and b if a diverter of 0.2 ohm be connected in parallel with the series winding? Neglect brush contact drop and ignore armature reaction.
D.C. generator
Plz answer all parts
A d.c.series generator has armature resistance of 0.5Q and series field resistance of 0.032.It drives a load of 50 A.If it has 6 turns/coil and total 540 coils on the armature and is driven at 1500 r.p.m.,calculate the terminal voltage at the load.Assume 4 poles, lap type winding, flux per pole as 2 mWb and total brush drop as 2 V.
An 8-pole d.c. shunt generator with 778 wave - connected armature conductors and running at 500 r.p.m. supplies a load of 12.5 ohm resistance at terminal voltage of 250V. The armature resistance is 0.24 ohm and the field resistance is 250 ohm. Find the armature current, the induced e.m.f. and the flux per pole.
. A 20 kW compound generator works on full load with terminal voltage of 250 V. The armature, series, and shunt windings have resistances of 0.05-ohm, 0.025 ohm, and 100 ohms, respectively. If the machine is connected short shunt, the emf generated is nearest to. (Our subject is Electrical Machines 1 ) (I need a clear answer and solution. Thank you so much)
(b) Derive the transformations for currents between a rotating balanced two phase (a,ẞ) winding and a pseudo stationary two phase (d,q) winding. (assume equal turns on all coils). From power invariance, show that the voltage transformations are identical to those for the currents. Describe, from physical concepts, how the transformation may be used to represent a three phase synchronous machine. Explain how torque is developed.
IDENTIFY TWO WAYS IN WHICH THE OUTPUT POLARITY OF A SHUNT DC GENERATOR CAN BE CHANGED.
A 12-kW, 250-V dc. shunt generator has armature and field resistances of 0.68 ohm and 120 ohm. respectively. Determine the total armature power developed in generator.

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