____ is a lightweight, air-entrained block that uses less energy to produce and is more energy-efficient than standard CMUs.

A. Autoclaved concrete
B. Aerated cement
C. Autoclaved aerated concrete
D. Aerated compacted cement


Answer: C

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The cation exchange capacities of alkaline soils are generally higher than those of acid soils (Vertisols excepted). Which of the following characteristics of alkaline soils most likely accounts for this high CEC?

A) high content of hydrous oxides of iron and aluminum B) high content of 2:1 type clays C) high exchangeable calcium D) high exchangeable sodium content E) high humus content

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Under which of the following conditions would you favor a finely ground dolomitic limestone as your choice of a liming material?

A) need to provide magnesium in addition to calcium B) need for a rapid reaction with the soil C) need to significantly reduce the exchangeable Al3+ level in the soil D) need for a material with a low shipping cost E) need to obtain a high soil pH

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The master cylinder body is NOT equipped with a ________

A) Transfer port B) Compensating port C) Replenishing port D) Cylinder bore

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What determines the efficiency of a Stirling engine?

What will be an ideal response?

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