CFESA Refrigeration Certification Test Study Guide with Complete Solutions

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CFESA Refrigeration Certification Test
Study Guide with Complete Solutions

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
.




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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 . A cap tube is ineffective on most commercial refrigeration systems
because : - Answer✔️✔️-D. it cannot respond to the refrigerant needs under
heavy loads




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16 . 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

17 . An automatic expansion valve does not : - Answer✔️✔️-C. react well in
situations of heavy loads .

18 . For maximum efficiency the thermal expansion valve superheat for a
freezer should be about : - Answer✔️✔️-A. 5 degrees

19 . For maximum system efficiency the TEV superheat for a cooler should
be about : - Answer✔️✔️-C. 8-10 degrees

20 . What type of oil is most commonly used with CFC refrigerants ? -
Answer✔️✔️-C. Mineral

21 . What type of oil must be used with R404A ? - Answer✔️✔️-D.
Polyolester

22 . What pressure relates to 20 ° F on R404A ? - Answer✔️✔️-56.7 psi

23 . What should be the maximum head pressure for a R404A system
operating in a 85 ° F ambient temperature ? - Answer✔️✔️-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 . - Answer✔️✔️-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




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