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What is the volume of a room that measures 10 ft by 20 ft
with an 8-ft ceiling?
a. 800 ft3
b. 1,600 ft3
c. 2,400 ft3
d. 3,200 ft3 - Answer-b (1,600 ft3)
What is the CFM requirements for an 1,800-ft2 house with
8-ft ceilings, if five air changes per hour are needed?
a. 400 CFM
b. 1,200 CFM
c. 1,600 CFM
d. 2,400 CFM - Answer-b (1,200 CFM)
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What is the CFM requirement for an 2,400-ft2 house with
8-ft ceilings, if five air changes per hour are needed?
a. 400 CFM
b. 1,200 CFM
c. 1,600 CFM
d. 2,400 CFM - Answer-c (1,600 CFM)
What is the cross-sectional area of a 10-in round metal
duct?
a. 79 in2
b. 200 in2
c. 314 in2
d. 418 in2
Note: Area of a circle = π x radius^2 - Answer-a (79 in2)
How fast does air with a velocity pressure of 0.20 in. w.g.
move through a round duct?
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a. 400 ft/min
b. 1,200 ft/min
c. 1,600 ft/min
d. 1,800 ft/min
Note: Velocity = 4005 x (the square root of velocity
pressure) - Answer-d (1,800 ft/min)
How fast does air with a velocity pressure of 0.20 in w.g.
move through a square duct?
a. 400 ft/min
b. 1,200 ft/min
c. 1,600 ft/min
d. 1,800 ft/min
Note: Velocity = 4005 x (the square root of velocity
pressure) - Answer-d (1,800 ft/min)
The ability to utilize all types of communication skills is
____ to the HVACR technician.
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a. not as important as "hands-on" technical skills
b. somewhat important
c. unimportant
d. very important - Answer-d (very important)
It is important to be ____ in filling out service orders so
that office staff, other technicians, and customers will know
what work you completed on the job.
a. clear
b. complete
c. concise
d. all of the above - Answer-d (all of the above: clear,
complete, concise)
When explaining to a customer that you have adjusted the
system charge, which of the following terms is most
appropriate?
a. Freon
b. Gas