What should be done to avoid water hammer?
a. always maintain a minimum residual pressure of 20 psi
b. purge air from the line before opening a valve or nozzle
c. open and close all valves slowly
d. never connect a hard suction hose to a pressurized water supply
Answer: c. open and close all valves slowly
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If an unsaturated parcel of air is cooled, it will eventually reach a temperature where the air will become saturated. This temperature is known as the ____
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A) population viability B) migration corridor implementation C) island biogeography D) endemic species vulnerability E) habitat fragmentation