Exam (elaborations)
ESCO Light Commercial Refrigeration EXAM 2022
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ESCO Light Commercial Refrigeration EXAM 2022
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ESCO Light Commercial Refrigeration EXAM2024/2025 with Complete Solutions.
The PT chart only applies to - ANSWER saturated refrigerants
When comparing the cylinder pressure for R404a, the cylinder will. - ANSWER have
the same pressure no matter how much liquid is present as long as both liquid and
vapor are present
A pound of R-404A liquid refrigerant occupies more space than a pound of R-404A
vapor - ANSWER False
Latent heat cannot be measured by a thermometer. - ANSWER True
Which of the following may cause a lower than normal suction superheat? (Check all
that apply) - ANSWER overcharge
a non-working evaporator fan motor
What can excessively high superheat in the suction line indicate? - ANSWER the
system is undercharged
The majority of heat added or removed to change the state of refrigerant is -
ANSWER latent
Where can saturated refrigerant be found within a refrigerant cycle? (Check all that
apply) - ANSWER condenser
evaporator
suction line
Subcooling provides all of the following EXCEPT - ANSWER insures suction
superheat will remain normal on ALL types of systems
A suction service valve that is ___ will allow refrigerant pressure to be measured and
allow freeflow of vapor into the compressor. - ANSWER cracked off of backseat
What term is used to describe a condition where liquid refrigerant is entering the
compressor pumping section? - ANSWER liquid slugging
Which of the following IS NOT needed to determine suction superheat? - ANSWER
the amount of refrigerant vapor in the suction gas
For heat to transfer, the medium absorbing heat must be - ANSWER cooler than the
refrigerant
, The term mass flow rate is used to determine - ANSWER the weight of refrigerant
flowing through the system
When an evaporator is "starved", it is likely - ANSWER not receiving adequate liquid
A TXV equipped evaporator should be charged solely based on suction superheat. -
ANSWER False
The condenser and evaporator can be the same size since the same amount of heat
absorbed in the evaporator will be rejected by the condenser. - ANSWER False
When there is liquid floodback in the suction line, the suction superheat will be -
ANSWER 0°F
Heat added to a vapor is caused by increased latent heat. - ANSWER False
A cooler that is used for storage of meat would provide the best storage condition
with a relative humidity level of - ANSWER 90%
The typical TD (temperature difference) on most commercial refrigeration equipment
(based on engineering and design) should be___, but is often found to be ___ in the
real world by technicians - ANSWER 10°F, 15°F to 20°
Another name for fixture temperature is - ANSWER cabinet temperature
space temperature
case temperature
Air conditioned spaces typically operate at a relative humidity level of - ANSWER
50%
Equipment that operates with its S.S.T. below 32°F must have consideration for -
ANSWER defrost
Small self-contained equipment (compressor is less than 1HP) typically is controlled
by ________to cycle on and off on temperature. - ANSWER a thermostat that
directly controls the compressor
Which of the following are commercial refrigeration temperature range
classifications? (Check all that are correct) - ANSWER low temp
high temp
ultra low temp
medium temp
The recommended storage temperature for meat is - ANSWER 28°F to 35°F
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