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HVAC Pretest BOMA with 100- correct answers already graded A+
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HVAC Pretest BOMA with 100- correct answers already graded A+
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HVAC PretestBOMA with 100%
correct answers
already graded
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Two basic categories of chillers are the ___.
a. Compression cycle and absorption
b. purge and absorption
c. absorption and lithium bromide
d. purge and lithium bromide - answer a.
Compression cycle and absorption
The five requirements for comfort are proper
temperature, humidity, filtration, _____, and
ventilation.
,a. circulation
b. velocity
c. sq.ft.
d. none of the above - answer a. circulation
The primary function of an expansion device
is to ____.
a. produce a reduction in the pressure on the
liquid refrigerant
b. regulate the flow of refrigerant into the
evaporator
c. lower the boiling point of the refrigerant
far enough below the temperature of the
load to get the needed heat transfer rate
d. all of the above - answer d. all of the
above
The wet-bulb depression is ____.
a. the difference between the dry-bulb and
wet-bulb temperatures
b. the same as the wet-bulb temperatures
,c. the same as the dry-bulb temperatures
d. when the air is saturated with moisture -
answer a. the difference between the dry-
bulb and wet-bulb temperatures
The dew-point temperature is the ___.
a. temperature when the air is saturated with
moisture
b. temperature when the moisture begins to
condense out of the air
c. difference between the dry-bulb and wet-
bulb temperatures
d. temperature of the air at 50% relative
humidity - answer b. temperature when the
moisture begins to condense out of the air
How many Btus are required to change one
pound of ice at 20°F to steam at 220°F?
a. 1,304 Btu/h
b. 2,608 Btu/h
c. 6,520 Btu/h
, d. 3,912 Btu/h - answer a. 1,304 Btu/h
If an R-12 refrigeration system is operating
with a 25.4 psig suction pressure, what is the
evaporator superheat if the evaporator outlet
temperature is 34 degrees F.
a. 9°F
b. 59°F
c. 34°F
d. 25°F - answer a. 9°F
On an R-11 or R-123 system, the refrigerant
removal process normally starts with the
removal of ____.
a. water
b. liquid refrigerant
c. vapor refrigerant
d. oil - answer b. liquid refrigerant
The condenser in a refrigeration system ___.
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