The following are the results of a sieve analysis: U. S. Sieve No Mass of soil retained (g)
1/2 in
4 0
10 48
20 56
40 85
60 51
80 106
10 092
20 087
Pan 35
A. Determine the percent finer than each sieve and plot a grain-size distribution curve
Develop a spreadsheet for the computations and plotting required for problems and make sure to turn on "minor gridlines" for the grain size axis. Please present the grain size distribution in semi-log scale.
B. Determine D10, D30, and D60 from the grain-size distribution curve.
C. Calculate the uniformity coefficient, Cu.
D. Calculate the coefficient of graduation, Cc.

Condition monitoring is a major component of. (clo4) a)- predictive maintenance. b)-preventive maintenance c)-proactive maintenance d)-reactive maintenance.

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?

The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object