CFESA REFRIGERATION CERTIFICATION TEST
1. The function of the compressor is : - Answer -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 : - Answer -A. they absorb
more heat in less time .
3 . Evaporator A operates with a 5 ° TD and evaporator B operates with a 15⁰ TD . -
Answer -D. Box A operates with higher humidity than box B
4 Whenever you re soldering refrigerant lines : - Answer -D. B & C
5 . R404A must be charged into a system : - Answer -A. In a liquid state
6 . If an evaporator fan motor needs to be replaced it must be replaced with : - Answer -
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 : - Answer -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 ? - Answer -C. R
- 409A
9 . Which refrigerant is an interim refrigerant choice for a R502 system that had a major
leak in the evaporator - Answer -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 : -
Answer -B. Micron gauge
11 . Which refrigerant would you convert a walk in freezer to if replacing the condensing
unit on an R502 system : - Answer -B. R404A
12 . Which phrase best describes the proper use for a refrigerated box using a cap tube
system ? - Answer -A. Storage freezer
13 . Which is the best example of the definition of a storage box ? - Answer -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 : - Answer -C. A thermal
expansion valve
15 . What type of oil is most commonly used with CFC refrigerants ? - Answer -C.
Mineral
16 . What type of oil must be used with R404A ? - Answer -D. Polyolester
17 . What pressure relates to 20 ° F on R404A ? - Answer -56.7 psi
18 . What should be the maximum head pressure for a R404A system operating in a 85
° F ambient temperature ? - Answer -294 psi
10 A system with R134A is operating at 146 psi head pressure . The temperature
measured four inches out of the condenser is 100 ° F . The ambient air temperature is
80 ° F . - Answer -D. the subcooling is 10 °
20 . A system operating with refrigerant R404A has a suction pressure of 29 psi . The
head pressure is 239 psi . The temperature on the line out of condenser is 85 degrees.
The temperature on the suction line at the outlet of the evaporator is 5 degrees . -
Answer -the superheat is 10 degrees
. A cap tube is ineffective on most commercial refrigeration systems because : -
Answer -D. it cannot respond to the refrigerant needs under heavy loads
22 . The sensor bulb on a TEV must be : - Answer -C. mounted tight to a clean surface
on the suction line close to the outlet of the coil
23 . An automatic expansion valve does not : - Answer -C. react well in situations of
heavy load21s .
24 . For maximum efficiency the thermal expansion valve superheat for a freezer should
be about : - Answer -A. 5 degrees
25 . For maximum system efficiency the TEV superheat for a cooler should be about : -
Answer -C. 8-10 degrees
26 . An R 404A cooler system using a cap tube system has a head pressure of 336 psi
and the line out of the condenser measures 95 degrees . Calculating the subcooling you
should see that : - Answer -the system may be overcharged
27 . The liquid line out of the liquid line drier is frosted ? This suggests that : - Answer -
the drier is restricted
1. The function of the compressor is : - Answer -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 : - Answer -A. they absorb
more heat in less time .
3 . Evaporator A operates with a 5 ° TD and evaporator B operates with a 15⁰ TD . -
Answer -D. Box A operates with higher humidity than box B
4 Whenever you re soldering refrigerant lines : - Answer -D. B & C
5 . R404A must be charged into a system : - Answer -A. In a liquid state
6 . If an evaporator fan motor needs to be replaced it must be replaced with : - Answer -
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 : - Answer -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 ? - Answer -C. R
- 409A
9 . Which refrigerant is an interim refrigerant choice for a R502 system that had a major
leak in the evaporator - Answer -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 : -
Answer -B. Micron gauge
11 . Which refrigerant would you convert a walk in freezer to if replacing the condensing
unit on an R502 system : - Answer -B. R404A
12 . Which phrase best describes the proper use for a refrigerated box using a cap tube
system ? - Answer -A. Storage freezer
13 . Which is the best example of the definition of a storage box ? - Answer -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 : - Answer -C. A thermal
expansion valve
15 . What type of oil is most commonly used with CFC refrigerants ? - Answer -C.
Mineral
16 . What type of oil must be used with R404A ? - Answer -D. Polyolester
17 . What pressure relates to 20 ° F on R404A ? - Answer -56.7 psi
18 . What should be the maximum head pressure for a R404A system operating in a 85
° F ambient temperature ? - Answer -294 psi
10 A system with R134A is operating at 146 psi head pressure . The temperature
measured four inches out of the condenser is 100 ° F . The ambient air temperature is
80 ° F . - Answer -D. the subcooling is 10 °
20 . A system operating with refrigerant R404A has a suction pressure of 29 psi . The
head pressure is 239 psi . The temperature on the line out of condenser is 85 degrees.
The temperature on the suction line at the outlet of the evaporator is 5 degrees . -
Answer -the superheat is 10 degrees
. A cap tube is ineffective on most commercial refrigeration systems because : -
Answer -D. it cannot respond to the refrigerant needs under heavy loads
22 . The sensor bulb on a TEV must be : - Answer -C. mounted tight to a clean surface
on the suction line close to the outlet of the coil
23 . An automatic expansion valve does not : - Answer -C. react well in situations of
heavy load21s .
24 . For maximum efficiency the thermal expansion valve superheat for a freezer should
be about : - Answer -A. 5 degrees
25 . For maximum system efficiency the TEV superheat for a cooler should be about : -
Answer -C. 8-10 degrees
26 . An R 404A cooler system using a cap tube system has a head pressure of 336 psi
and the line out of the condenser measures 95 degrees . Calculating the subcooling you
should see that : - Answer -the system may be overcharged
27 . The liquid line out of the liquid line drier is frosted ? This suggests that : - Answer -
the drier is restricted
