Q5// Answer the following questions. 1-Explain the construction and principle of operation of D.C generator. 2-How can you differentiate between the excitation system of a DC series generator and that of a DC shunt generator? 3-What for brushes are employed in DC generator? 4-Which are the types of armature windings commonly used in DC machines and where are employed? 5- Why the field coils of a DC shunt generator are wound with a large number of turns of fine wire. What type of DC generator can be used for battery charging?

Q5// Answer the following questions. 1-Explain the construction and principle of operation of D.C generator. 2-How can you differentiate between the excitation system of a DC series generator and that of a DC shunt generator? 3-What for brushes are employed in DC generator? 4-Which are the types of armature windings commonly used in DC machines and where are employed? 5- Why the field coils of a DC shunt generator are wound with a large number of turns of fine wire. What type of DC generator can be used for battery charging?

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter11: Transient Stability

Section: Chapter Questions

Problem 11.3P

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The output of a shunt generator is 66 A at 100 volts. Armature and field resistances are, respectively, 0.04 ohm and 25 ohms. If the efficiency at this load is 88%, determine the core and friction losses
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Questions:-1. What is the basic different between the internal characteristics and the external characteristics of d.c shunt generator? 2. For which reasons its not possible to develop rated voltage of d.c shunt generator, both in unloaded and loaded conditions? 3- What are the reasons of fall of terminal voltage of a d.c. shunt generator?
The following sequential statements, when completed, describe armature reaction in a DC generator. Complete each statement by inserting the appropriate word from among those provided in the word list below. Notes: A word may be used more than once. There are more words than required. Word list:armature, between, brushes, clockwise, commutator, currents, direction, distortion, increase, induces, inline, interpoles, main-field, neutral-plane, power, rotating, rotation, slip-rings, slow-down, sparking, speed, torque, voltage. The effects of armature reaction can be reduced by equipping the DC machine with _________________ connected in series with the _______________, or by physically shifting the position of the __________________. If this is not done _______________ will occur at the brushes and the generator output ________________ will be reduced. Prolonged operation in this state can lead to sustained damage to the brushes and _________________.
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A 150 kW, 250-volt compound DC generator has its field windings which are connected in long shunt. If the shunt-field winding resistance is 20 ohms, what is the current in the series-field winding? (Note that the series field resistance is connected in series with the armature.)
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Q2)A. Explain compound DC generator, also describe its types and terminal characteristics of compound DC generator. proper explanation and diagram
1. How does loading of the Generator affect the Generator’s Terminal Voltage (VT) and Load Current (IL)?2. Write down the Voltage equation of a Separately excited DC Generator.3. What is the reason for drop in Generator’s Terminal voltage, from No load to Full load?
A 250 V, compound generator has armature, series field and shunt felid resistance of 0.4 Ω, 0.2 Ω and 125 Ω respectively. If this generator supply10 Kw ,at rated voltage. Ignore armature reaction and assuming a drop of 1 volt per brush. Find the induce e.m.f and the armature current when the machine is connected Short compound . إضافة ملف