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Absa 4b Final Exam, Practice Exam And Study Guide
For Guaranteed Pass(All In One Document) 2025/2026
Newest Update
It is good design practice to select a steam coil size
a) so that 100% of the coil capacity is needed when the air
temperature entering the coil is -1 degrees C
b) so that at least 40% of the coil capacity is needed when
the air temperature entering the coil is -1 degree C
c) so that at least 80% of the coil capacity is needed when
the air temperature at the coil inlet is -1 degree C
d) so that at least 10% of the coil capacity is needed when
the air temperature at the coil inlet is -5 degrees C
e) so that it is twice the size that is required to handle
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the heating load - ANSWER-B
The purpose of a vacuum breaker used with steam coils is
to
a) ensure positive air pressure in the conditioned space
b) ensure negative air pressure in the conditioned space
c) prevent excessive temperatures within the steam coil
d) prevent possible freezing caused by a vacuum or
negative
pressure in the steam coil
e) ensure proper operation of the steam control valve -
ANSWER-D
In a hot water coil which of the following is not included
for providing a good guideline for the correct application of
the system with minimal possibility of freeze-up?
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a) Positive air venting of the coil is essential
b) The air velocity should exceed 10 m/s
c) A constant flow of water should be fed to the coil
d) The water velocity should exceed 0.8 m/s
e) The water temperature should be maintained at a
reasonable preset temperature - ANSWER-B
Which of the following is not a cause of freezing in hot
water coils?
a) failure of the circulating pump
b) very low circulating water velocity
c) very high circulating water velocity
d) failure of the heat source
e) poor air venting of the coil - ANSWER-C
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The purpose of the "freeze-stat" temperature controller
used
with hot water coils is to
a) close the outside air dampers and stop the fan if the
heat source fails or the low limit temperature controller
malfunctions
b) increase the hot water flow through the coil if outside
air temperature is too low
c) increase the heat source temperature if the outside air
temperature decreases
d) open the outside air dampers wide when the outside air
temperature rises
e) increase the fan output if the return air temperature is
Absa 4b Final Exam, Practice Exam And Study Guide
For Guaranteed Pass(All In One Document) 2025/2026
Newest Update
It is good design practice to select a steam coil size
a) so that 100% of the coil capacity is needed when the air
temperature entering the coil is -1 degrees C
b) so that at least 40% of the coil capacity is needed when
the air temperature entering the coil is -1 degree C
c) so that at least 80% of the coil capacity is needed when
the air temperature at the coil inlet is -1 degree C
d) so that at least 10% of the coil capacity is needed when
the air temperature at the coil inlet is -5 degrees C
e) so that it is twice the size that is required to handle
,2|Page
the heating load - ANSWER-B
The purpose of a vacuum breaker used with steam coils is
to
a) ensure positive air pressure in the conditioned space
b) ensure negative air pressure in the conditioned space
c) prevent excessive temperatures within the steam coil
d) prevent possible freezing caused by a vacuum or
negative
pressure in the steam coil
e) ensure proper operation of the steam control valve -
ANSWER-D
In a hot water coil which of the following is not included
for providing a good guideline for the correct application of
the system with minimal possibility of freeze-up?
,3|Page
a) Positive air venting of the coil is essential
b) The air velocity should exceed 10 m/s
c) A constant flow of water should be fed to the coil
d) The water velocity should exceed 0.8 m/s
e) The water temperature should be maintained at a
reasonable preset temperature - ANSWER-B
Which of the following is not a cause of freezing in hot
water coils?
a) failure of the circulating pump
b) very low circulating water velocity
c) very high circulating water velocity
d) failure of the heat source
e) poor air venting of the coil - ANSWER-C
, 4|Page
The purpose of the "freeze-stat" temperature controller
used
with hot water coils is to
a) close the outside air dampers and stop the fan if the
heat source fails or the low limit temperature controller
malfunctions
b) increase the hot water flow through the coil if outside
air temperature is too low
c) increase the heat source temperature if the outside air
temperature decreases
d) open the outside air dampers wide when the outside air
temperature rises
e) increase the fan output if the return air temperature is
