RETA Industrial Refrigeration Book 2 Exam Newest
2025 Complete 200+ Questions And Correct Answers
(Verified Answers) |Already Graded A+
Where should oil be drained from in a halocarbon gravity flooded system?
(pg. 7-7)
A) The bottom of the receiver
B) The bottom of the low-pressure accumulator
C) The return line from the evaporator to the surge drum
D) Oil is 'skimmed' off the surface of the liquid
D) Oil is 'skimmed' off the surface of the liquid
What controls the recirculation ratio on a gravity flooded evaporator?
(pg. 7-4)
A) The setting of the hand expansion valve
B) The boiling action within the evaporator
C) The back pressure regulator
D) Gravity flooded evaporators do not have recirculation ratios
B) The boiling action within the evaporator
What is the maximum recirculation ratio for a gravity flooded evaporator
reference in the text? (pg. 7-4)
A) 3:1
B) 4:1
C) 16:1
D) Gravity flooded evaporators do not have recirculation ratios
C) 16:1
What happens to flash gas in a gravity flooded evaporator system? (pg. 7-4)
A) It goes directly to the evaporator
,B) It goes through the surge drum to the compressor
C) There is no flash gas in a gravity flooded evaporator system
D) It is used to power the pumper drum
B) It goes through the surge drum to the compressor
In regard to oil accumulation in evaporators? (pg. 7-7)
A) Oil should be removed because it interferes with the ability of the refrigerant
to exchange heat at the surface of the evaporator tube
B) Oil is desirable in the evaporator because it has a better heat transfer co-
efficient
C) Oil accumulation in the evaporator improves defrost characteristics
D) Oil normally does not accumulate in evaporators
A) Oil should be removed because it interferes with the ability of the refrigerant to
exchange heat at the surface of the evaporator tube
How much superheat is found at the outlet of a surge drum of a properly
operating gravity flooded system? (pg. 7-2)
A) 5°F per pound of refrigerant
B) 5°C per pound of refrigerant
C) 10°F
D) There is generally no superheat
D) There is generally no superheat
Which evaporator type would see a greater liquid refrigerant flow rate for the
same refrigeration capacity? (pg. 7-1)
A) Dry expansion under heavy heat load
B) Gravity flooded under heavy heat load
C) Dry expansion under light heat load
D) Gravity flooded under light heat load
B) Gravity flooded under heavy heat load
Oil return from an R-22 system low temperature vessel is? (pg. 7-7)
A) Easy because oil vaporizes
,B) Drained from the bottom of the unit
C) Recovered by special features in the low side vessels
D) Recovered by gravity flow
C) Recovered by special features in the low side vessels
What would be a service problem if Ammonia type intercoolers are used in an R-
22 system? (pg. 7-7)
A) Oil must be drained from the bottom on a regular basis
B) Oil might accumulate in the intercooler since there are no skimmer ports in
an Ammonia intercooler
C) Oil will return to the compressor with no problem
D) There will be no service problems if they are the same pressure rating
B) Oil might accumulate in the intercooler since there are no skimmer ports in an
Ammonia intercooler
Adjusting flow in a two-pipe secondary coolant system may be difficult because?
(pg. 8-9)
A) Brine solution has a high specific gravity
B) Load variation
C) Evaporator size variation
D) Short circuiting
D) Short circuiting
The three pipe brine system is considered balanced because? (pg. 8-9)
A) The evaporators are the same size
B) Resistance to flow is fairly equal in all circuits
C) The pipe size is the same
D) It has restricting valves
B) Resistance to flow is fairly equal in all circuits
How is the change of state affected when a quantity of salt is added to water
that results in a 10% solution? (pg. 8-3)
A) The freezing temperature is lowered
, B) The specific gravity is decreased
C) The freezing temperature is increased
D) There is no effect
A) The freezing temperature is lowered
All glycol-based solutions can be classified as? (pg. 8-6)
A) Secondary coolants
B) Non-toxic
C) Corrosive
D) Brines
A) Secondary coolants
What is the approximate freeze point of a 20% solution of calcium chloride? (pg.
8-4)
A) 10°F
B) 0°F
C) -10°F
D) -20°F
B) 0°F
What is the eutectic point of a brine solution? (pg. 8-4)
A) The lowest temperature at which a mixture freezes
B) The temperature at which a liquid, solid, and gas can all exist
C) The temperature at which brine is used
D) The flow rate at which a brine becomes turbulent
A) The lowest temperature at which a mixture freezes
What are the two greatest advantages of secondary coolant systems?
(pg. 8-2)
A) Secondary coolants are always non-toxic and reduce the cost of providing
refrigeration
B) Secondary coolant systems are more efficient than DX evaporators and can
reduce the primary refrigerant charge
2025 Complete 200+ Questions And Correct Answers
(Verified Answers) |Already Graded A+
Where should oil be drained from in a halocarbon gravity flooded system?
(pg. 7-7)
A) The bottom of the receiver
B) The bottom of the low-pressure accumulator
C) The return line from the evaporator to the surge drum
D) Oil is 'skimmed' off the surface of the liquid
D) Oil is 'skimmed' off the surface of the liquid
What controls the recirculation ratio on a gravity flooded evaporator?
(pg. 7-4)
A) The setting of the hand expansion valve
B) The boiling action within the evaporator
C) The back pressure regulator
D) Gravity flooded evaporators do not have recirculation ratios
B) The boiling action within the evaporator
What is the maximum recirculation ratio for a gravity flooded evaporator
reference in the text? (pg. 7-4)
A) 3:1
B) 4:1
C) 16:1
D) Gravity flooded evaporators do not have recirculation ratios
C) 16:1
What happens to flash gas in a gravity flooded evaporator system? (pg. 7-4)
A) It goes directly to the evaporator
,B) It goes through the surge drum to the compressor
C) There is no flash gas in a gravity flooded evaporator system
D) It is used to power the pumper drum
B) It goes through the surge drum to the compressor
In regard to oil accumulation in evaporators? (pg. 7-7)
A) Oil should be removed because it interferes with the ability of the refrigerant
to exchange heat at the surface of the evaporator tube
B) Oil is desirable in the evaporator because it has a better heat transfer co-
efficient
C) Oil accumulation in the evaporator improves defrost characteristics
D) Oil normally does not accumulate in evaporators
A) Oil should be removed because it interferes with the ability of the refrigerant to
exchange heat at the surface of the evaporator tube
How much superheat is found at the outlet of a surge drum of a properly
operating gravity flooded system? (pg. 7-2)
A) 5°F per pound of refrigerant
B) 5°C per pound of refrigerant
C) 10°F
D) There is generally no superheat
D) There is generally no superheat
Which evaporator type would see a greater liquid refrigerant flow rate for the
same refrigeration capacity? (pg. 7-1)
A) Dry expansion under heavy heat load
B) Gravity flooded under heavy heat load
C) Dry expansion under light heat load
D) Gravity flooded under light heat load
B) Gravity flooded under heavy heat load
Oil return from an R-22 system low temperature vessel is? (pg. 7-7)
A) Easy because oil vaporizes
,B) Drained from the bottom of the unit
C) Recovered by special features in the low side vessels
D) Recovered by gravity flow
C) Recovered by special features in the low side vessels
What would be a service problem if Ammonia type intercoolers are used in an R-
22 system? (pg. 7-7)
A) Oil must be drained from the bottom on a regular basis
B) Oil might accumulate in the intercooler since there are no skimmer ports in
an Ammonia intercooler
C) Oil will return to the compressor with no problem
D) There will be no service problems if they are the same pressure rating
B) Oil might accumulate in the intercooler since there are no skimmer ports in an
Ammonia intercooler
Adjusting flow in a two-pipe secondary coolant system may be difficult because?
(pg. 8-9)
A) Brine solution has a high specific gravity
B) Load variation
C) Evaporator size variation
D) Short circuiting
D) Short circuiting
The three pipe brine system is considered balanced because? (pg. 8-9)
A) The evaporators are the same size
B) Resistance to flow is fairly equal in all circuits
C) The pipe size is the same
D) It has restricting valves
B) Resistance to flow is fairly equal in all circuits
How is the change of state affected when a quantity of salt is added to water
that results in a 10% solution? (pg. 8-3)
A) The freezing temperature is lowered
, B) The specific gravity is decreased
C) The freezing temperature is increased
D) There is no effect
A) The freezing temperature is lowered
All glycol-based solutions can be classified as? (pg. 8-6)
A) Secondary coolants
B) Non-toxic
C) Corrosive
D) Brines
A) Secondary coolants
What is the approximate freeze point of a 20% solution of calcium chloride? (pg.
8-4)
A) 10°F
B) 0°F
C) -10°F
D) -20°F
B) 0°F
What is the eutectic point of a brine solution? (pg. 8-4)
A) The lowest temperature at which a mixture freezes
B) The temperature at which a liquid, solid, and gas can all exist
C) The temperature at which brine is used
D) The flow rate at which a brine becomes turbulent
A) The lowest temperature at which a mixture freezes
What are the two greatest advantages of secondary coolant systems?
(pg. 8-2)
A) Secondary coolants are always non-toxic and reduce the cost of providing
refrigeration
B) Secondary coolant systems are more efficient than DX evaporators and can
reduce the primary refrigerant charge
