4. What for brushes are employed in DC generator? 5. What is the function of armature in a DC 6. What is the function of commutator in a DC machine in generator action. 7. Which are the different types of armature windings commonly used in DC machines? 8. Which is the best-suited material for commutator segments? 10. Why are the graphite or carbon brushes preferred over copper brushes for use in DC machin 11. Write down the emf equation of a DC generator. 12. What is the principle of operation of a DC generator? Why is a commutator and brush arrang necessary for the operation of a DC generator? 13. Describe the principle of operation and brief constructional details of a DC machine. 14. Enumerate all the parts of a DC machine. State the material and the function of each part. 15. Explain in brief the construction of a DC machine. 16. Derive the emf equation of a DC machine. generator?

4. What for brushes are employed in DC generator? 5. What is the function of armature in a DC 6. What is the function of commutator in a DC machine in generator action. 7. Which are the different types of armature windings commonly used in DC machines? 8. Which is the best-suited material for commutator segments? 10. Why are the graphite or carbon brushes preferred over copper brushes for use in DC machin 11. Write down the emf equation of a DC generator. 12. What is the principle of operation of a DC generator? Why is a commutator and brush arrang necessary for the operation of a DC generator? 13. Describe the principle of operation and brief constructional details of a DC machine. 14. Enumerate all the parts of a DC machine. State the material and the function of each part. 15. Explain in brief the construction of a DC machine. 16. Derive the emf equation of a DC machine. generator?

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

1.- The production of a force in a conductor carrying current that is inside a magnetic field, is the basis of? 2.- What happens in the flux of a ferromagnetic core of a transformer if the cross section is reduced? : 3.- This force is present internally in the DC motor when the rotor rotates within the magnetic field. 4.- What happens if the field circuit opens in a shunt connected direct current generator?
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.)
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 _________________.
The armature winding resistance of a long shunt connected DC generator is 0.4ohm, the resistances of the shunt and serial field windings are 125 ohms and 0.1 ohms, respectively. While the generator supplies 8KW of power to the load it feeds, which is the voltage it produces since the output voltage is 250V?
An 8 pole DC shunt generator with wave winding has 4800 conductor with 20 turns and average per pole flux is 20 mwb and armature current and armature resistance is 20 A and 0.5 ohm respectively find? (i) Induced emf (ii) Terminal voltage
A short shunt compound DC generator delivers a load current of 30 A at 220 V and has armature, series field and shunt field resistances of 0.05, 0.3 and 200Ω respectively. Calculate the induced emf, the armature current and the voltage regulation. Allow 1 V per brush for contact dro
A short shunt compound DC generator supplies a load current of 10A at a voltage of 10 volts. If the resistance of armature, shunt field and series field windings are 0.001 ohm, 1 ohm 0.00 ohm respectively. a) Draw the the figure. And find the generated voltage.
22 The DC voltage is generated in the Armature winding of DC Generator. Select one: True False
. When a self-excited compound DC generator supplies load, the terminal voltage is not the same as the generated emE Why? a) voltage drop across the armature resistance will reduce the voltage available at the load terminals b) where there is a series field, voltage drop across the series field resistance will reduce the voltage available at the load terminals c) both "a" and "b" d) neither "a" nor "b"
What are the necessary conditions for voltage build-up in dc shunt generator ?
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
a) Which components determine the excitation current of a transformer? How are they in transformer equivalent circuit modeled? b) Why is the polarity determination of a transformer made? Briefly explain how the experiment is done. c) If the direction of rotation of the motor changes when the feeding ends are changed in a DC motor, what can be said about its type? d) Why does the peak voltage increase as the serial DC generator is loaded? How long does this increase continue?