Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Chapter 28, Problem 3RQ
Why is friability an important grit property?
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A distillation column with a total condenser and a partial reboiler is separating ethanol andwater at 1.0 atm. Feed is 0.32 mol fraction ethanol and it enters as a saturated liquid at 100mol/s on the optimum plate. The distillate product is a saturated liquid with 80 mol% ethanol.The condenser removes 5615 kW. The bottoms product is 0.05 mol fraction ethanol. AssumeCMO is valid.(a) Find the number of equilibrium stages for this separation. [6 + PR](b) Find how much larger the actual reflux ratio, R, used is than Rmin, i.e. R/Rmin. [3]Note: the heats of vaporization of ethanol and water are λe = 38.58 and λw = 40.645
We have a feed that is a binary mixture of methanol and water (60.0 mol% methanol) that issent to a system of two flash drums hooked together. The vapor from the first drum is cooled,which partially condenses the vapor, and then is fed to the second flash drum. Both drumsoperate at 1.0 atm and are adiabatic. The feed to the first drum is 1000 kmol/hr. We desire aliquid product from the first drum that is 35.0 mol% methanol. The second drum operates at afraction vaporized of (V/F)2 = 0.25.(a) Find the liquid flow rate leaving the first flash drum, L1 (kmol/hr). [286 kmol/hr](b) Find the vapor composition leaving the second flash drum, y2. [0.85]
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The steel curved bar shown has rectangular cross-section with a radial height h = 6 mm and thickness b = 4mm. The
radius of the centroidal axis is R = 80 mm. A force P = 10 N is applied as shown. Assume the steel modulus of
207,000 MPa and G = 79.3(103) MPa, repectively.
elasticity and shear modulus E =
Find the vertical deflection at point B. Use Castigliano's method for a curved flexural member and since R/h > 10,
neglect the effect of shear and axial load, thereby assuming that deflection is due to merely the bending moment.
Note the inner and outer radii of the curves bar are:
r = 80 + ½ (6) = 83 mm, r₁ = 80 − ½ (6) = 77 mm
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Sπ/2 sin² 0 d = √π/² cos² 0 d0 =
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Chapter 28 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 28 - What are machining processes that use abrasive...Ch. 28 - What is attrition in an abrasive grit?Ch. 28 - Why is friability an important grit property?Ch. 28 - Explain the relationship between grit size and...Ch. 28 - Why is aluminum oxide used more frequently than...Ch. 28 - Why is CBN superior to silicon carbide as an...Ch. 28 - What materials commonly are used as bonding agents...Ch. 28 - Why is the grade of a bond in a grinding wheel...Ch. 28 - How does grade differ from structure in a grinding...Ch. 28 - Prob. 10RQ
Ch. 28 - How does loading differ from glazing?Ch. 28 - What is meant by the statement that grinding is a...Ch. 28 - What is accomplished in dressing a grinding wheel?Ch. 28 - How does abrasive machining differ from ordinary...Ch. 28 - Prob. 15RQCh. 28 - How is the feed of the workpiece controlled in...Ch. 28 - Why is grain spacing important in grinding wheels?Ch. 28 - Prob. 18RQCh. 28 - How does plunge-cut grinding compare to...Ch. 28 - Prob. 20RQCh. 28 - What is the purpose of low-stress grinding?Ch. 28 - How is low-stress grinding done compared to...Ch. 28 - Prob. 23RQCh. 28 - Why are centerless grinders so popular in industry...Ch. 28 - Explain how an SEM micrograph is made. Check the...Ch. 28 - Why are vacuum chucks and magnetic chucks widely...Ch. 28 - How does creep feed grinding differ from...Ch. 28 - Why does a lap not wear, even though it is softer...Ch. 28 - How do honing stones differ from grinding wheels?Ch. 28 - What is meant by charging a lap?Ch. 28 - Why is a honing head permitted to float in a hole...Ch. 28 - How does a coated abrasive differ from an abrasive...Ch. 28 - Why are the bottoms of chips shown in Figure 28.9...Ch. 28 - Prob. 34RQCh. 28 - What are the common causes of grinding accidents?Ch. 28 - What other machine tool does a surface grinder...Ch. 28 - Figure 28.11 showed residual stress distributions...Ch. 28 - In grinding, what is infeed versus cross feed?Ch. 28 - One of the problems with waterjet cutting is that...Ch. 28 - In AWC, what keeps the abrasive jet from machining...Ch. 28 - Prob. 1PCh. 28 - Explain why it is that a small particle of a...Ch. 28 - In grinding, both the wheel and workpiece are...
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