For corrosion, possible causes may be ____.

a. liquid frozen in capillary tube
b. mechanical abuse; severe vibration; shock
c. overheating; overvoltage; voltage surges
d. excess moisture; salt air; acid fumes


d. excess moisture; salt air; acid fumes

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Which of the following materials is a pozzolana?

A) Portland cement B) Sand C) Fly ash D) Concrete E) Lime

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The future of resource management should not be in computer modeling

Indicate whether the statement is true or false

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Based on the Cu?Zn phase diagram shown in Fig. 11.23, and reproduced below, give the microstructure of three copper?zinc alloys containing (i) 30 at. %, (ii) 35 at. %, and (iii) 50 at. % Zn at:

(a) 800°C (b) 500°C (c) 25°C Assuming that the alloys were solidified by equilibrium cooling, give the phases and constituents.

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The lifetimes, in months, of two components in a system, denoted X and Y, have joint probability density function


a. What is the probability that both components last longer than one month?
b. Find the marginal probability density functions and .
c. Are X and Y independent? Explain.

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