One good feature of an electronic charging scale is that it counts upward as refrigerant is removed, to tell the technician how much refrigerant was used.
Answer the following statement true (T) or false (F)
True
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Convective heat transfer accounts for:
a. 30% to 40% b 40% to 50% c. 60% to 70% d. 70% to 80%
In the accompanying figure, the items identified with a number 3 are the ____.
A. midpoint of triangles B. diagonals and center lines C. arcs through midpoints D. base lines
Noise ________
A) is produced by man-made sources only B) is greater when the SNR value is larger C) is the primary cause of error in fiber optic communications D) can result from natural sources
Why are draft inducer fans necessary in today's furnaces?
A) To separate the flue gas from the heat through centrifugal force B) To move the flue gases through the ductwork C) The flue gases cannot make their way through the new heat exchangers on their own. D) To move gas into the burner assembly