1. What are the age hardening alloy systems in Al-based alloys
based on classification of major alloyingsystems for Al-based
alloys?
2.In alloy system of Al - 4.4%Cu - 0.8%Si - 0.8%Mn - 0.5%Mg
which is commonly used for aircraft structures, sketch and explain
all transformation stages during age hardening. What is the driving
mechanism for each step?
4. Identify the pathophysiologic stages of pneumococcal
pneumonia (IN ORDER OF DEVELOPMENT) a. Massive dilation of
capillaries with alveolar filling with organisms, neutrophils, and
fibrin b. Exudate becomes lysed and processed by macrophages, and
normal lung tissue is restoring c. Outpouring of fluid into alveoli
that supports microorganism growth and spread d. Blood flow
decreases, and leukocytes and fibrin consolidate in affected lung
tissue.
An annealed aluminum alloy slab with a thickness of 12 mm and
width of 1m is to be cold rolled to a thickness of 9 mm using
2-high rolls with roll diameter of 1m. The rolls have a coefficient
of friction of 0.08 and they are rotating with a speed of 18 RPM.
The aluminum has an entrance speed of 50 m/min and a width that
does not change as a result of drawing. The strength coefficient K
=240 and...
The diameters of aluminum alloy rods produced on an extrusion
machine are known to have a standard deviation of 0.0001 in. A
random sample of 25 rods has an average diameter of 0.5046 in.
(a) Test the hypothesis that mean rod diameter is 0.5025 in.
Assume a two-sided alternative and use
(b) Find the P-value for this test.
(c) Construct a 95% two-sided confidence interval on the mean
rod diameter.