A shunt generator supplies 96 A at a terminal voltage of 200 V. The armature and shuntfield resistances are 0.1 2 and 50 2 respectively. The iron and frictional losses are 2500W. Find (i) e.m.f. generated (ii) copper losses (iii) efficiency.

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Answered: A shunt generator supplies 96 A at a…

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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A d.c. generator has an armature e.m.f. of 100 V when the useful flux per pole is 20 mWb and the speed is 800 r.p.m. calculate the generated e.m.f. (i) with the same flux and a speed of 1000 r.p.m. (ii) with a flux per pole of 24 mWb and a speed of 900 r.p.m.
5. An 8-pole lap wound armature has 960 conductors and is run at 500 rpm. If the flux per pole is 40 mWb. Find the emf generated.a. 320 Vb. 315 Vc. 310 Vd. 318 V
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A 250 V d.c. shunt generator has 1250 watts constant loss. Find out load current at maximum efficiency. Take armature resistance as 0.1ohm.
Ex1 : An 8 pole armature is wound with 420 conductors , the flux and the speed are each that the average e.m.f. generated in each conductor is 2.2 v and conductor is capable of carrying a fun load current of 100 A . calculate the terminal voltage on no load, the output current on full load , and total power generated on full load when the armature as lap and wave winding.
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.
Example : In a 110 V, d.c. compound generator, the resistance of the armature, shunt field and series field are 0.06 , 25 and 0.04 respectively. The load consists of 200 lamps each rated at 55 W, 110 V. Find the total e.m.f. generated and the armature current when the machine is connected in (a) long shun
Sketch the load characteristic of a d.c. generator with (i) shunt (ii) series excitation. Give reasonsfor the particular shape in each case.The O.C.C. at 700 r.p.m. of a series generator with separately-excited field is as follows :Field current (A) : 20 40 50 60 75Armature e.m.f. (V) : 190 360 410 450 480Determine the current and terminal voltage as a self-excited series machine when running at 600 r.p.m.with a load of 6 Ω connected to the terminal. Resistance of armature and series winding is 0.3Ω. Ignore effectof armature reaction.
D2. When a generator's full-load output voltage is the same as its no-load output voltage it is said to be a) under-compounded b) flat-compounded c) over-compounded d) none of the above D3. The output of an overcompounded DC generator can be lowered by use of a a) rheostat connected in series with the series field b) rheostat connected in parallel with the series field c) rheostat connected in parallel with the shunt field d) none of the above D4. When might it be desirable to use an overcompounded generator? a) never b) always c) to compensate for line loss d) when you need a higher no-load voltage than your full-load voltage
The total flux per pole in the air-gap of a 50-Hz alternator is 0.06 Wb. The flux-density distribution is given by T. The coil-span is 4/5 of a pole pitch. Determine the rms emf per armature turn. Find also the emf per armature turn when the flux were assumed to be sinusoidally distributed.
The armature of 6 pole d.c. generator has a wave winding containing 664 conductors.Calculate the generated e.m.f. when flux per pole is 0.06 water and the speed is 250 r.p.m. At what speed must the armature be driven to generate an e.m.f. of 250 V if the flux pole is reduced to 0.058 weber?
Answer the following a. How does the relative permeability of a ferromagnetic material vary with magnetomotive force? b. How does a decrease in flux produce an increase in speed in a linear machine? c. Will current be leading or lagging voltage in an inductive load? Will the reactive power of the load be positive or negative? Explain in detail.

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A shunt generator supplies 96 A at a terminal voltage of 200 V. The armature and shunt field resistances are 0.1 2 and 50 2 respectively. The iron and frictional losses are 2500 W. Find (i) e.m.f. generated (ii) copper losses (iii) efficiency.