EBK 3I-EBK: WELDING PRINCIPLES & APPLIC
8th Edition
ISBN: 9780176919764
Author: Jeffus
Publisher: VST
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Chapter 8, Problem 8R
What does the nozzle insulator provide to the plasma torch?
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A thin plastic membrane separates hydrogen from air. The molar concentrations of hydrogen in the membrane at the innner and outer surfaces are determined to be 0.045 and 0.002 kmol/m^3 respectiveley. The binary diffusion coefficent of hydrogen in plastic at the operation temp is 5.3*10^-10 m^2/s. Determine the mass flow rate of hydrogen by diffusion through the membrane under steady conditions if the thickeness of the membrane is 2mm and 0.5 mm.
Chapter 8 Solutions
EBK 3I-EBK: WELDING PRINCIPLES & APPLIC
Ch. 8 - List the types of metal that a plasma torch can be...Ch. 8 - What two charged particles exist in a plasma?Ch. 8 - What is the approximate temperature of a plasma...Ch. 8 - To prevent a manual-type torch from damage, it is...Ch. 8 - How are high-power plasma torches cooled?Ch. 8 - What is the name of the torch part made of copper...Ch. 8 - What is the name of the material that resists...Ch. 8 - What does the nozzle insulator provide to the...Ch. 8 - What are two other names that the shield is...Ch. 8 - How often should cables, control wiring, and hoses...
Ch. 8 - What may be on a coolant reservoir to indicate the...Ch. 8 - Why is the cooling water switched on and off with...Ch. 8 - Why must a filter dryer be used on the air supply...Ch. 8 - List the four common variations of the...Ch. 8 - Define standoff distance.Ch. 8 - What two terms refer to the squareness of a cut?Ch. 8 - What is the pilot arc?Ch. 8 - List five factors that can affect the kerf width.Ch. 8 - What factors affect the bevel angle left on the...Ch. 8 - List five things that are affected by changes in...Ch. 8 - What is dross?Ch. 8 - List some advantages of using a water table.Ch. 8 - Why are most hand PAC torches limited to 100...Ch. 8 - List five special safety concerns for the PAC...Ch. 8 - Describe the three techniques for piercing a plate...Ch. 8 - Prob. 26R
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