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Identify and state the historical significance of Louis Agassiz.
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Harvard zoologist who advocated special creation even after Darwin’s Theory of Evolution.
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(a) Stirling silver is an alloy of silver with 7.5 percent of copper. Describe the structure that one should expect if a specimen of stirling silver were to be heated from room temperature to 782°C, and allowed to come to equilibrium at this latter temperature.
(b) If the specimen of stirling silver, equilibrated at 782°C, is now slowly cooled to 400°C, what would be the nature of the microstructure? Give the amount and composition of each phase. (c) Finally, assume the specimen is cooled very rapidly (quenched) from 782°C to 400°C. Describe the structure that one might expect.
Assume that an alloy of nickel with 2 wt. percent aluminum is cast and by metallographic examination, a dendrite arm spacing of 50 µ is observed. It is also determined that the composition difference between the center of an arm, and the midpoint between two arms is one percent. Estimate the time required for homogenization if the annealing temperatute is to be 1400°C and the compostion difference is to be reduced to one?tenth or its original value. Note: See Table 12.5.
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A motor may be controlled manually by a ____.
A. float switch B. pressure switch C. toggle switch D. time clock
When low-carbon steel with a carbon content of less than 0.30 percent is in freezing temperatures, it must be preheated to a temperature above _____
A) 100°F (38°C) B) 500°F (260°C) C) 40°F (4°C) D) 70°F (21°C)