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RETA Industrial Refrigeration Book Exam Newest
2025 Complete 300 Questions And Correct Answers
(Verified Answers) |Already Graded A
The heat used to melt the frost and ice in hot gas defrost systems comes
primarily from? (pg. 10-9)
A) Cooling the gas to a lower temperature
B) Deposing the gas
C) Condensing the gas
D) De-superheating the gas ......answer.....C) Condensing the gas
Which of the following is not a source of frost? (pg. 10-1)
A) Moisture from infiltrating air
B) Moisture from inside sealed packages
C) Moisture from product
D) Moisture from the respiration of freezer workers in the freezer
......answer.....B) Moisture from inside sealed packages
If the air in the plant is relatively moisture free,? (pg. 10-2)
A) There is less need for defrosting
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B) The system will pick up more superheat in the suction lines
C) The total system cooling capacity will be reduced
D) There will be no impact on system operation ......answer.....A) There is less
need for defrosting
As an evaporator builds up with ice,? (pg. 10-1)
A) There is no change in performance of the evaporator
B) Heat exchange capacity of the evaporator goes down
C) Heat exchange capacity of the evaporator goes up
D) The amount of flash gas created in the expansion valve goes up
......answer.....B) Heat exchange capacity of the evaporator goes down
Manual defrosting of a sub-freezing evaporator is accomplished by?
(pg. 10-16)
A) Closing the suction valve
B) Using blades and chip hammers
C) Following the procedure developed and tested at the facility
D) Closing the liquid supply valve to the evaporator and opening the hot gas
supply valve ......answer.....C) Following the procedure developed and tested
at the facility
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Which is NOT a cause of excess ice build-up on evaporators in low
temperature rooms? (pg. 10-17)
A) Blocked condensate drain lines
B) High discharge pressure
C) Inadequate pump down time
D) Time interval between scheduled defrosts is too long ......answer.....B)
High discharge pressure
One of the purposes of the expansion device is? (pg. 4-1)
A) To "meter" the flow of liquid refrigerant into the low side
B) To control the temperature of the evaporator
C) To control the pressure in the evaporator
D) To minimize flash gas in the low side of the system ......answer.....A) To
"meter" the flow of liquid refrigerant into the low side
Hand expansion valves? (pg. 4-2)
A) If set properly, will vary flow rate automatically to maintain proper flow
into the evaporator
B) Are generally gate type valves
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C) Are not meant to be metering valves
D) May be manually adjusted to set the necessary flow rate into the low side
......answer.....D) May be manually adjusted to set the necessary flow rate into
the low side
In order for the thermostatic expansion valve to open, the force above the
diaphragm must be higher than? (pg. 4-10)
A) The combined forces of the evaporator pressure and the force of the
superheat adjusting spring
B) Atmospheric pressure
C) Condensing pressure
D) Only the tension of the superheat spring ......answer.....A) The combined
forces of the evaporator pressure and the force of the superheat adjusting
spring
Gravity flooded evaporators have a vessel that? (pg. 7-2)
A) Must be located lower than the evaporators it feeds
B) Feeds pumps which provide liquid to the evaporators
C) May be called an intercooler
D) Separates liquid from vapor ......answer.....D) Separates liquid from vapor
RETA Industrial Refrigeration Book Exam Newest
2025 Complete 300 Questions And Correct Answers
(Verified Answers) |Already Graded A
The heat used to melt the frost and ice in hot gas defrost systems comes
primarily from? (pg. 10-9)
A) Cooling the gas to a lower temperature
B) Deposing the gas
C) Condensing the gas
D) De-superheating the gas ......answer.....C) Condensing the gas
Which of the following is not a source of frost? (pg. 10-1)
A) Moisture from infiltrating air
B) Moisture from inside sealed packages
C) Moisture from product
D) Moisture from the respiration of freezer workers in the freezer
......answer.....B) Moisture from inside sealed packages
If the air in the plant is relatively moisture free,? (pg. 10-2)
A) There is less need for defrosting
,2|Page
B) The system will pick up more superheat in the suction lines
C) The total system cooling capacity will be reduced
D) There will be no impact on system operation ......answer.....A) There is less
need for defrosting
As an evaporator builds up with ice,? (pg. 10-1)
A) There is no change in performance of the evaporator
B) Heat exchange capacity of the evaporator goes down
C) Heat exchange capacity of the evaporator goes up
D) The amount of flash gas created in the expansion valve goes up
......answer.....B) Heat exchange capacity of the evaporator goes down
Manual defrosting of a sub-freezing evaporator is accomplished by?
(pg. 10-16)
A) Closing the suction valve
B) Using blades and chip hammers
C) Following the procedure developed and tested at the facility
D) Closing the liquid supply valve to the evaporator and opening the hot gas
supply valve ......answer.....C) Following the procedure developed and tested
at the facility
,3|Page
Which is NOT a cause of excess ice build-up on evaporators in low
temperature rooms? (pg. 10-17)
A) Blocked condensate drain lines
B) High discharge pressure
C) Inadequate pump down time
D) Time interval between scheduled defrosts is too long ......answer.....B)
High discharge pressure
One of the purposes of the expansion device is? (pg. 4-1)
A) To "meter" the flow of liquid refrigerant into the low side
B) To control the temperature of the evaporator
C) To control the pressure in the evaporator
D) To minimize flash gas in the low side of the system ......answer.....A) To
"meter" the flow of liquid refrigerant into the low side
Hand expansion valves? (pg. 4-2)
A) If set properly, will vary flow rate automatically to maintain proper flow
into the evaporator
B) Are generally gate type valves
, 4|Page
C) Are not meant to be metering valves
D) May be manually adjusted to set the necessary flow rate into the low side
......answer.....D) May be manually adjusted to set the necessary flow rate into
the low side
In order for the thermostatic expansion valve to open, the force above the
diaphragm must be higher than? (pg. 4-10)
A) The combined forces of the evaporator pressure and the force of the
superheat adjusting spring
B) Atmospheric pressure
C) Condensing pressure
D) Only the tension of the superheat spring ......answer.....A) The combined
forces of the evaporator pressure and the force of the superheat adjusting
spring
Gravity flooded evaporators have a vessel that? (pg. 7-2)
A) Must be located lower than the evaporators it feeds
B) Feeds pumps which provide liquid to the evaporators
C) May be called an intercooler
D) Separates liquid from vapor ......answer.....D) Separates liquid from vapor
