A perfect vacuum is ____.
A. 14.7 psi
B. 0 psig
C. 30 in. Hg
D. 27 in. Hg
Answer: C
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What is a “cascade” system?
a. The low temp system evaporator cools the condenser of the high temp system. b. The high temp system evaporator cools the condenser of the low temp system.
Why is the cooling temperature difference often different than the difference between the indoor and outdoor temperatures?
What will be an ideal response?
The SCR turns off by __________.
A. reducing the holding current value B. removing the positive potential at the gate C. both A and B
How many cubic yards of grout are needed to fill a 6" block wall with a length of 32' and height of 12'?
What will be an ideal response?