For a low-temperature refrigeration system with an evaporator saturation temperature of -40°F, why might R-502 be used instead of R-12?
What will be an ideal response?
R-502 would keep the suction pressure positive (above atmospheric pressure), while and R-12 system would operate with the suction pressure in a vacuum (below atmospheric pressure).
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Theodore Roosevelt is sometimes called the "first modern president." Interpret this phrase and explain how it fits Roosevelt's conduct of the office.
What will be an ideal response?
What are disadvantages of phenolic pistons?
What will be an ideal response?
When preparing a boiler for dry storage, _____
a. coat the fireside surfaces with an anticorrosive compound b. coat the fireside surfaces with a desiccant c. coat the waterside surfaces with mineral oil d. flush the waterside surfaces with low-pressure water
Fill in the blank(s) with the appropriate word(s).