Study Guide with Lab Manual for Jeffus' Welding: Principles and Applications, 8th
8th Edition
ISBN: 9781305494701
Author: Larry Jeffus
Publisher: Cengage Learning
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Chapter 1, Problem 16R
Name two commonly used thermal cutting processes.
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Assignment 10, Question 4, Problem Book #202
Problem Statement
An ideal Brayton cycle with a two-stage compressor, a two-stage turbine, and a regenerator
operates with a mass flow rate of 25 kg/s. The regenerator cold inlet is at 490 K and its
effectiveness is 60%. Ambient conditions are 90 kPa and 20°C. The intercooler operates at
450 kPa and the reheater operates at 550 kPa. The temperature at the exit of the combustion
chamber is 1,400 K. Heat is removed in the intercooler at a rate of 2.5 MW and heat is added
in the reheater at a rate of 10 MW. Determine the thermal efficiency and the back work
ratio. Use a cold air standard analysis with cp = 1.005 kJ/(kg K) and k = 1.4.
.
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Thermal efficiency (%)
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Back work ratio (%)
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Assignment 10, Question 3, Problem Book #198
Problem Statement
Consider a Brayton cycle with a regenerator. The regenerator has an effectiveness of 75%.
The compressor inlet conditions are 1.2 bar and 300 K and the mass flowrate is 4.5 kg/s. The
compressor outlet pressure is 9 bar. Both the compressor and turbine consist of a single
isentropic stage. What minimum power output must be achieved before the regenerator
begins to have a benefit? Use an air-standard analysis.
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Stage
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Q-3 Consider an engine operating on the ideal Diesel cycle with air as the
working fluid. The volume of the cylinder is 1200 cm³ at the beginning of the
Compression process, 75 cm³ at the end, and 150 cm³ after the heat addition
process. Air is at 17°c and lookpa at the beginning of the compression proc
ess. Determine @ The pressure at the beginning of the heat rejection
process. the net work per cycle in kjⒸthe mean effective pressur.
Answers @264.3 KN/m² ②0.784 kj or 544-6 kj © 697 KN
19
2
m
Chapter 1 Solutions
Study Guide with Lab Manual for Jeffus' Welding: Principles and Applications, 8th
Ch. 1 - What type of welding uses a hammer to join heated...Ch. 1 - What advantage does resistance welding have over...Ch. 1 - What term describes the fusion or growing together...Ch. 1 - Welding is defined as a joining process that...Ch. 1 - Name three items that are manufactured using...Ch. 1 - Name three popular welding processes.Ch. 1 - What does shielded metal arc welding (SMAW) use to...Ch. 1 - What is the purpose of the solid flux that covers...Ch. 1 - What protects the molten weld metal from...Ch. 1 - Why is it important to clean all contamination...
Ch. 1 - What welding process uses a solid electrode wire...Ch. 1 - What are the advantages of GMA welding?Ch. 1 - How is a flux cored arc welding (FCAW) electrode...Ch. 1 - What two welding processes are semiautomatic...Ch. 1 - How is a high-temperature flame produced at the...Ch. 1 - Name two commonly used thermal cutting processes.Ch. 1 - Which cutting process uses a forceful stream of...Ch. 1 - What cutting process uses a stiff, highly ionized,...Ch. 1 - List three factors that can help determine which...Ch. 1 - Name three methods used to perform welding,...Ch. 1 - Name five different types of welding career...Ch. 1 - What are some skills that entry-level welders...Ch. 1 - What are the names of the two American Welding...Ch. 1 - What does the AWS abbreviation “SENSE” stand for?Ch. 1 - What practical knowledge subject areas are covered...Ch. 1 - What four welding processes are covered in the...Ch. 1 - What is the name of the organization that sponsors...
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