Question #3 An eight-pole, 25-kW, 120-V DC generator has a duplex lap wound armature which has 64 coils with 16 turns per coil. Its rated speed is 2400 r/min. a. How much flux per pole is required to produce the rated voltage in this generator at no-load conditions? b. What is the current per path in the armature of this generator at the rated load? c. What is the induced torque in this machine at the rated load? d. How many brushes must this motor have? How wide must each one be? e. If the resistance of this winding is 0.011 Q per turn, what is the armature resistance RĄ of this machine?

Question #3 An eight-pole, 25-kW, 120-V DC generator has a duplex lap wound armature which has 64 coils with 16 turns per coil. Its rated speed is 2400 r/min. a. How much flux per pole is required to produce the rated voltage in this generator at no-load conditions? b. What is the current per path in the armature of this generator at the rated load? c. What is the induced torque in this machine at the rated load? d. How many brushes must this motor have? How wide must each one be? e. If the resistance of this winding is 0.011 Q per turn, what is the armature resistance RĄ of this machine?

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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DC Generator

An electromechanical machine which converts input mechanical energy to respective output electric energy is called a generator.

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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
(a) A 6 pole generator with lap wound armature has 135 slots each having 14 conductors. The flux per pole is 20 mWb. At what speed must the armature rotate to give an induced EMF of 210V. (b) What will be the voltage developed, if the winding is wave connected and the armature rotates at the same speed
i. Briefly describe the 5 major types of DC generators according to the manner in which their field flux is produced.
In a 4 pole DC shunt generator with a shunt field resistance of 100 ohms and an armature resistance of 1 ohm has 378 wave connected conductors in its armature. The flux per pole is 0.02 Wb. If a load resistance of 10 ohms is connected across the load terminals and the generator is driven at 1000 rpm, calculate the power absorbed by the load.
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A 500-V, wave-wound, 750 r.p.m. shunt generator supplies a load of 195 A. The armature has 720 conductors and shunt field resistance is 100 2. Find the demagnetising amp-turns/pole if brushes are advanced through 3 commutator segments at this load. Also, calculate the extra shunt field turns required to neutralize (600, 4800, 120) 4. this demagnetisation.
1. A machine delivers power to the load at 220 V while being driven at 1,050 rpm. At this load, the armature circuit dissipates 650 W. The armature of a 6-pole separately excited dc generator is lap wound with 534 conductors. If the flux per pole of this generator is 30- mWb, determine the kW rating of the load served. Assume a total brush contact drop of 1.5 V.
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