Exercise 2A shunt generator delivers 14A at 270V and the resistance of theshunt field and armature are 100 Q and 0.75 Q2, respectively.Calculate:i. The generated emf and the efficiency of this operatingcondition.ii. The generated emf if the shunt field impedance was tripleand if it was double and the efficiency of these cases.iii. What emf could serve tha same active power of load but atload voltage of 240V and the efficiency in this case.

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Answered: Exercise 2 A shunt generator delivers…

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 4-poled.c.shuntgenerator with a wave- wound armature has to supply a load of 500 lampseach of 100W at 250V.Allowing 10V for the voltage drop in the connecting leads between the generator and the loadand drop of 1V per brush, Calculate the speed at which the generator should bedriven.The magnetic flux per pole is 30 mWband the armature and shunt field resistance are respectively 0.05Nand 652.The number of armature conductors is 390.
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 short shunt compound generator delivers 150A at a terminal voltage is 230V. The shunt field current is 2.5A. The resistances of the armature, series field and diverter are 0.032-ohm, 0.015 ohm and 0.03 ohm, respectively. Calculate the electrical efficiency of the generator at this load.
Full solutions for the question with explanation
A 1200 kW,60 Hz synchronous alternator A identical governor droop of 0.0005 Hz/kW.Machine A takes two third of 1000kW bus load at 60 Hz.lf an additional 800 kW load is connected to the bus determine (a) bus frequency (b) load on each machine. is in parallel with a 400 kW,60 Hz alternator B.Both machines have (a) 58.6 Hz (b) 566.67 kW, 433.33 kW. (a) 59.6 Hz (b) 866.67 kW, 133.33 kW (a) 59.8 Hz (b) 666.67 kW, 333.33 kW (a) 58.9 Hz (b) 766.67 kW, 233.33 kW
25. A six-pole wave wound armature has 250 conductors when driven at 400 rpm, the emf generated is 260 V. What is the useful flux per pole?a. 50 mWbb. 48 mWbc. 52 mWbd. 55 mWb
Why is it necessary to conduct polarity tests on transformers?
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.
A dc series generator is sipplying a current of 10A to a load trhrough a feeder of total resistance 1.5 ohms. The generated voltage is 550V. The armature and series field resistance are respectively 0.5 and 0.6 ohm respectively. Determine the voltage at the terminal of the generator and at the feeder.
A 3-phase, 60 Hz, 6 pole alternator has an air gap flux which is sinusoidally distributed. The stator has 5 slots per pole per phase and each slots contains 4 conductors arranged in two layers. The coil pitch is 12 slots, with normal excitation and rated speed, the voltage induced per conductor is 25 V. The open circuited emf of this Y-connected machine between lines is?
(a) Explain briefly what is fringing effect and leakage flux. (b) A ferromagnetic core is shown in Figure 1. The depth of the core is 10 cm. The other dimensions of the core are as shown in the figure. By assuming the magnetic leakage to be negligible and relative permeability of the core is 800. Calculate the total reluctance and find the value of the current that will produce a flux of 0.01 Wb. With this current, calculate the flux density at the top of the core 20 cm 40 cm 10 cm, 30 cm 500 turns 30 cm 30 cm Figure 1
Describe the figures below and how each of figure below are working

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