CFESA Refrigeration Certification Test - Questions With
Accurate Answers
1. The function of the compressor is : Right Ans - B. to lower the pressure in
the evaporator so that the refrigerant temperature is lowered below the
temperature of the air in the box .
2 . Forced air evaporator coils are commonly used because : Right Ans - A.
they absorb more heat in less time .
3 . Evaporator A operates with a 5 ° TD and evaporator B operates with a 15 ⁰
TD . Right Ans - D. Box A operates with higher humidity than box B
4 Whenever you re soldering refrigerant lines : Right Ans - D. B & C
5 . R404A must be charged into a system : Right Ans - A. In a liquid state
6 . If an evaporator fan motor needs to be replaced it must be replaced with :
Right Ans - C. Any motor with the exact HP , speed , voltage , mounting and
rotation
7 . The fan blade on an evaporator or condenser must be positioned in the
housing or shroud so that : Right Ans - B. The blade is mounted mid way
into the evaporator housing opening or fan shroud opening on a condenser .
8. Which of the following refrigerants is an interim choice for a replacement
for R - 12 in a system that had a leak in the condenser and lost all of its
refrigerant ? Right Ans - C. R - 409A
9 . Which refrigerant is an interim refrigerant choice for a R502 system that
had a major leak in the evaporator Right Ans - d . R408A
10 . When evacuating a refrigeration system what tool is needed to ensure a
good evacuation and to help inform you if there is any moisture or leaks in the
system : Right Ans - B. Micron gauge
11 . Which refrigerant would you convert a walk in freezer to if replacing the
condensing unit on an R502 system : Right Ans - B. R404A
, 12 . Which phrase best describes the proper use for a refrigerated box using a
cap tube system ? Right Ans - A. Storage freezer
13 . Which is the best example of the definition of a storage box ? Right Ans
- A. A freezer on which the door is opened 8 times a day
14 . In order to maintain proper temperature under the various loads , a
cooler or freezer located on a front prep line must be equipped with : Right
Ans - C. A thermal expansion valve
15 . A cap tube is ineffective on most commercial refrigeration systems
because : Right Ans - D. it cannot respond to the refrigerant needs under
heavy loads
16 . The sensor bulb on a TEV must be : Right Ans - C. mounted tight to a
clean surface on the suction line close to the outlet of the coil
17 . An automatic expansion valve does not : Right Ans - C. react well in
situations of heavy loads .
18 . For maximum efficiency the thermal expansion valve superheat for a
freezer should be about : Right Ans - A. 5 degrees
19 . For maximum system efficiency the TEV superheat for a cooler should be
about : Right Ans - C. 8-10 degrees
20 . What type of oil is most commonly used with CFC refrigerants ? Right
Ans - C. Mineral
21 . What type of oil must be used with R404A ? Right Ans - D. Polyolester
22 . What pressure relates to 20 ° F on R404A ? Right Ans - 56.7 psi
23 . What should be the maximum head pressure for a R404A system
operating in a 85 ° F ambient temperature ? Right Ans - 294 psi
Accurate Answers
1. The function of the compressor is : Right Ans - B. to lower the pressure in
the evaporator so that the refrigerant temperature is lowered below the
temperature of the air in the box .
2 . Forced air evaporator coils are commonly used because : Right Ans - A.
they absorb more heat in less time .
3 . Evaporator A operates with a 5 ° TD and evaporator B operates with a 15 ⁰
TD . Right Ans - D. Box A operates with higher humidity than box B
4 Whenever you re soldering refrigerant lines : Right Ans - D. B & C
5 . R404A must be charged into a system : Right Ans - A. In a liquid state
6 . If an evaporator fan motor needs to be replaced it must be replaced with :
Right Ans - C. Any motor with the exact HP , speed , voltage , mounting and
rotation
7 . The fan blade on an evaporator or condenser must be positioned in the
housing or shroud so that : Right Ans - B. The blade is mounted mid way
into the evaporator housing opening or fan shroud opening on a condenser .
8. Which of the following refrigerants is an interim choice for a replacement
for R - 12 in a system that had a leak in the condenser and lost all of its
refrigerant ? Right Ans - C. R - 409A
9 . Which refrigerant is an interim refrigerant choice for a R502 system that
had a major leak in the evaporator Right Ans - d . R408A
10 . When evacuating a refrigeration system what tool is needed to ensure a
good evacuation and to help inform you if there is any moisture or leaks in the
system : Right Ans - B. Micron gauge
11 . Which refrigerant would you convert a walk in freezer to if replacing the
condensing unit on an R502 system : Right Ans - B. R404A
, 12 . Which phrase best describes the proper use for a refrigerated box using a
cap tube system ? Right Ans - A. Storage freezer
13 . Which is the best example of the definition of a storage box ? Right Ans
- A. A freezer on which the door is opened 8 times a day
14 . In order to maintain proper temperature under the various loads , a
cooler or freezer located on a front prep line must be equipped with : Right
Ans - C. A thermal expansion valve
15 . A cap tube is ineffective on most commercial refrigeration systems
because : Right Ans - D. it cannot respond to the refrigerant needs under
heavy loads
16 . The sensor bulb on a TEV must be : Right Ans - C. mounted tight to a
clean surface on the suction line close to the outlet of the coil
17 . An automatic expansion valve does not : Right Ans - C. react well in
situations of heavy loads .
18 . For maximum efficiency the thermal expansion valve superheat for a
freezer should be about : Right Ans - A. 5 degrees
19 . For maximum system efficiency the TEV superheat for a cooler should be
about : Right Ans - C. 8-10 degrees
20 . What type of oil is most commonly used with CFC refrigerants ? Right
Ans - C. Mineral
21 . What type of oil must be used with R404A ? Right Ans - D. Polyolester
22 . What pressure relates to 20 ° F on R404A ? Right Ans - 56.7 psi
23 . What should be the maximum head pressure for a R404A system
operating in a 85 ° F ambient temperature ? Right Ans - 294 psi
