CFESA Refrigeration Certification
Test Exam Q’s and A’s
1. The function of the compressor is : - -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 : - -A. they
absorb more heat in less time .
- 3 . Evaporator A operates with a 5 ° TD and evaporator B operates with a
15⁰ TD . - -D. Box A operates with higher humidity than box B
- 4 Whenever you re soldering refrigerant lines : - -D. B & C
- 5 . R404A must be charged into a system : - -A. In a liquid state
- 6 . If an evaporator fan motor needs to be replaced it must be replaced
with : - -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 : - -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 ? - -C. R - 409A
- 9 . Which refrigerant is an interim refrigerant choice for a R502 system
that had a major leak in the evaporator - -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 : - -B. Micron gauge
- 11 . Which refrigerant would you convert a walk in freezer to if replacing
the condensing unit on an R502 system : - -B. R404A
- 12 . Which phrase best describes the proper use for a refrigerated box
using a cap tube system ? - -A. Storage freezer
- 13 . Which is the best example of the definition of a storage box ? - -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 : - -C. A
thermal expansion valve
- 15 . A cap tube is ineffective on most commercial refrigeration systems
because : - -D. it cannot respond to the refrigerant needs under heavy loads
- 16 . The sensor bulb on a TEV must be : - -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 : - -C. react well in situations
of heavy loads .
- 18 . For maximum efficiency the thermal expansion valve superheat for a
freezer should be about : - -A. 5 degrees
- 19 . For maximum system efficiency the TEV superheat for a cooler should
be about : - -C. 8-10 degrees
- 20 . What type of oil is most commonly used with CFC refrigerants ? - -C.
Mineral
- 21 . What type of oil must be used with R404A ? - -D. Polyolester
- 22 . What pressure relates to 20 ° F on R404A ? - -56.7 psi
- 23 . What should be the maximum head pressure for a R404A system
operating in a 85 ° F ambient temperature ? - -294 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 . - -D. 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 . - -the 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 : - -the system may be
overcharged
- 27 . The liquid line out of the liquid line drier is frosted ? This suggests
that : - -the drier is restricted
Test Exam Q’s and A’s
1. The function of the compressor is : - -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 : - -A. they
absorb more heat in less time .
- 3 . Evaporator A operates with a 5 ° TD and evaporator B operates with a
15⁰ TD . - -D. Box A operates with higher humidity than box B
- 4 Whenever you re soldering refrigerant lines : - -D. B & C
- 5 . R404A must be charged into a system : - -A. In a liquid state
- 6 . If an evaporator fan motor needs to be replaced it must be replaced
with : - -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 : - -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 ? - -C. R - 409A
- 9 . Which refrigerant is an interim refrigerant choice for a R502 system
that had a major leak in the evaporator - -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 : - -B. Micron gauge
- 11 . Which refrigerant would you convert a walk in freezer to if replacing
the condensing unit on an R502 system : - -B. R404A
- 12 . Which phrase best describes the proper use for a refrigerated box
using a cap tube system ? - -A. Storage freezer
- 13 . Which is the best example of the definition of a storage box ? - -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 : - -C. A
thermal expansion valve
- 15 . A cap tube is ineffective on most commercial refrigeration systems
because : - -D. it cannot respond to the refrigerant needs under heavy loads
- 16 . The sensor bulb on a TEV must be : - -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 : - -C. react well in situations
of heavy loads .
- 18 . For maximum efficiency the thermal expansion valve superheat for a
freezer should be about : - -A. 5 degrees
- 19 . For maximum system efficiency the TEV superheat for a cooler should
be about : - -C. 8-10 degrees
- 20 . What type of oil is most commonly used with CFC refrigerants ? - -C.
Mineral
- 21 . What type of oil must be used with R404A ? - -D. Polyolester
- 22 . What pressure relates to 20 ° F on R404A ? - -56.7 psi
- 23 . What should be the maximum head pressure for a R404A system
operating in a 85 ° F ambient temperature ? - -294 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 . - -D. 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 . - -the 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 : - -the system may be
overcharged
- 27 . The liquid line out of the liquid line drier is frosted ? This suggests
that : - -the drier is restricted
