Civil Engineering Reference
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a. Calculate the mean, standard deviation, and the coefficient of
variation of the data.
b. Using a spreadsheet program, create a control chart for these data
showing the target value and the upper and lower specification
limits. Are the asphalt content data within the specification lim-
its? Comment on any trend and possible reasons.
1.34 Briefly discuss the concept behind each of the following measuring
devices:
a. LVDT
b. strain gauge
c. proving ring
d. load cell
1.35 Referring to the dial gage shown in Fig. P1.35, determine
a. Accuracy
b. Sensitivity
c. Range, given that the small pointer moves one division for each
full turn of the large pointer
d. Which of the preceding items can be improved through
calibration?
FIGURE P1.35
1.36 Measurements should be reported to the nearest 1000, 100, 10, 1,
0.1, 0.01, 0.001 units, etc., depending on their variability and in-
tended use. Using your best judgment, how should the following
measurements be reported?
a. Deformation of a steel specimen during the tension test (in.)
b. Tensile strength of steel (psi)
c. Modulus of elasticity of aluminum (MPa)
d. Weight of aggregate in a sieve analysis test (grams)
e. Compressive strength of portland cement concrete (psi)
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