Photo-operated devices fall into one of three categories. What are the categories?
What will be an ideal response?
Photo-operated devices fall into one of three categories: photovoltaic, photoemissive, and photoconductive.
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What are two differences between R404A and R477 (CO2) piping for the same evaporator temperature and system Btuh capacity?
a. R404A piping must withstand lower pressure and is a smaller diameter than R477 b. R477 piping must withstand higher pressure, but has smaller diameter than R404A
In a right triangle if the hypotenuse is 22 centimeters and one leg is 18 centimeters, what is the length to the nearest hundredth centimeter of the other leg?
What will be an ideal response?
Hard hats have. a suspension system that will keep the shell of the helmet _______________ from the worker's head
What will be an ideal response?
Soot forming in the heat exchanger can be caused by
A) the presence of coal tar in the gas B) Too much gas in the gas air mixture C) Too much air in the gas air mixture D) Excessively high combustion temperatures