When the outdoor temperature falls below the balance point, an air-to-air heat pump _____.
a. must be shut down
b. can no longer extract heat from the outside air
c. loses heating capacity
d. produces more heat than the structure requires
c. loses heating capacity
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?Name the four engine strokes.
What will be an ideal response?
The by-pass valve on most passenger car oil filters will open when resistance to flow reaches about ____.
A. 8 psi B. 12 psi C. 14 psi D. 16 psi
The name of the computer unit that sends appropriate signals to all the other units to cause a specific instruction to be executed is the:
A) output unit. B) memory unit. C) arithmetic/logic unit. D) control unit.
Why has the use of halide torches in leak detection decreased in popularity?
A) It has harmful environmental implications. B) It has been banned by many states. C) It is a very expensive method. D) It does not work with most modern refrigerants.