CFESA Refrigeration Certification Test
1. The function of the compressor is : - answerB. 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 : - answerA. they absorb
more heat in less time .
3 . Evaporator A operates with a 5 ° TD and evaporator B operates with a 15 ⁰ TD . -
answerD. Box A operates with higher humidity than box B
4 Whenever you re soldering refrigerant lines : - answerD. B & C
5 . R404A must be charged into a system : - answerA. In a liquid state
6 . If an evaporator fan motor needs to be replaced it must be replaced with : - answerC.
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 : - answerB. 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 ? - answerC. R -
409A
9 . Which refrigerant is an interim refrigerant choice for a R502 system that had a major
leak in the evaporator - answerd . 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 : -
answerB. Micron gauge
11 . Which refrigerant would you convert a walk in freezer to if replacing the condensing
unit on an R502 system : - answerB. R404A
12 . Which phrase best describes the proper use for a refrigerated box using a cap tube
system ? - answerA. Storage freezer
13 . Which is the best example of the definition of a storage box ? - answerA. 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 : - answerC. A thermal
expansion valve
15 . A cap tube is ineffective on most commercial refrigeration systems because : -
answerD. it cannot respond to the refrigerant needs under heavy loads
16 . The sensor bulb on a TEV must be : - answerC. mounted tight to a clean surface on
the suction line close to the outlet of the coil
17 . An automatic expansion valve does not : - answerC. react well in situations of
heavy loads .
18 . For maximum efficiency the thermal expansion valve superheat for a freezer should
be about : - answerA. 5 degrees
19 . For maximum system efficiency the TEV superheat for a cooler should be about : -
answerC. 8-10 degrees
20 . What type of oil is most commonly used with CFC refrigerants ? - answerC. Mineral
21 . What type of oil must be used with R404A ? - answerD. Polyolester
22 . What pressure relates to 20 ° F on R404A ? - answer56.7 psi
23 . What should be the maximum head pressure for a R404A system operating in a 85
° F ambient temperature ? - answer294 psi
24 . 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 . - answerD. the subcooling is 10 °
25 . 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 . -
answerthe superheat is 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 : - answerthe system may be overcharged
27 . The liquid line out of the liquid line drier is frosted ? This suggests that : - answerthe
drier is restricted
28 The suction line to the compressor on a freezer using a TEV is frosted and iced up .
This could be do to : - answerthe suction line is not insulated or is poorly insulated
1. The function of the compressor is : - answerB. 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 : - answerA. they absorb
more heat in less time .
3 . Evaporator A operates with a 5 ° TD and evaporator B operates with a 15 ⁰ TD . -
answerD. Box A operates with higher humidity than box B
4 Whenever you re soldering refrigerant lines : - answerD. B & C
5 . R404A must be charged into a system : - answerA. In a liquid state
6 . If an evaporator fan motor needs to be replaced it must be replaced with : - answerC.
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 : - answerB. 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 ? - answerC. R -
409A
9 . Which refrigerant is an interim refrigerant choice for a R502 system that had a major
leak in the evaporator - answerd . 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 : -
answerB. Micron gauge
11 . Which refrigerant would you convert a walk in freezer to if replacing the condensing
unit on an R502 system : - answerB. R404A
12 . Which phrase best describes the proper use for a refrigerated box using a cap tube
system ? - answerA. Storage freezer
13 . Which is the best example of the definition of a storage box ? - answerA. 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 : - answerC. A thermal
expansion valve
15 . A cap tube is ineffective on most commercial refrigeration systems because : -
answerD. it cannot respond to the refrigerant needs under heavy loads
16 . The sensor bulb on a TEV must be : - answerC. mounted tight to a clean surface on
the suction line close to the outlet of the coil
17 . An automatic expansion valve does not : - answerC. react well in situations of
heavy loads .
18 . For maximum efficiency the thermal expansion valve superheat for a freezer should
be about : - answerA. 5 degrees
19 . For maximum system efficiency the TEV superheat for a cooler should be about : -
answerC. 8-10 degrees
20 . What type of oil is most commonly used with CFC refrigerants ? - answerC. Mineral
21 . What type of oil must be used with R404A ? - answerD. Polyolester
22 . What pressure relates to 20 ° F on R404A ? - answer56.7 psi
23 . What should be the maximum head pressure for a R404A system operating in a 85
° F ambient temperature ? - answer294 psi
24 . 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 . - answerD. the subcooling is 10 °
25 . 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 . -
answerthe superheat is 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 : - answerthe system may be overcharged
27 . The liquid line out of the liquid line drier is frosted ? This suggests that : - answerthe
drier is restricted
28 The suction line to the compressor on a freezer using a TEV is frosted and iced up .
This could be do to : - answerthe suction line is not insulated or is poorly insulated
