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REFRIGERATION BOOK 2 (2013 REVISION) &
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(2023 REVISION) 400+ EXAM REVIEW
QUESTIONS WITH CORRECT ANSWERS
Reta Industrial Refrigeration Book 2 (2013 Revision)
In a refrigeration system (at normal refrigeration pressures), how does the heat
content of a pound of saturated vapor compare to the heat content of a pound of
saturated liquid? (pg. 2-10)
A) The heat quantity in a pound of saturated vapor is greater than the heat quantity
in a pound of saturated liquid at the same pressure
B) The heat quantity in a pound of saturated vapor is less than the heat quantity in
a pound of saturated liquid at the same pressure
C) The heat quantity in a pound of saturated vapor is equal to the heat quantity in a
pound of saturated liquid at the same pressure
D) It is not possible to measure heat content in a pound of saturated vapor -
ANSWER-A) The heat quantity in a pound of saturated vapor is greater than the
heat quantity in a pound of saturated liquid at the same pressure
In a refrigeration system (at normal refrigeration pressures), how does the volume
of a pound of saturated vapor compare to the volume of a pound of saturated
liquid? (pg. 2-
A) A pound of saturated vapor occupies a larger volume than a pound of saturated
liquid at the same pressure
B) A pound of saturated vapor occupies a smaller volume than a pound of
saturated liquid at the same pressure
C) A pound is a pound, they take up the same volume
pg. 1
,D) The volume of a pound of saturated liquid depends on the pressure applied to it
- ANSWER-A) A pound of saturated vapor occupies a larger volume than a pound
of saturated liquid at the same pressure
The effectiveness of a heat transfer surface depends on several factors. One factor
the operator has control over is? (pg. 1-8)
A) Evaporator surface area
B) Material the evaporator is made of
C) Type of fans used
D) Cleanliness of the evaporator - ANSWER-D) Cleanliness of the evaporator
One advantage of using axial type fans is? (pg. 1-12)
A) Quieter operation
B) They require less motor horsepower per CFM
C) They can move air further across the space to be cooled
D) They can work against a higher static pressure - ANSWER-B) They require less
motor horsepower per CFM
Which of the following is NOT a result of scale build-up on a condenser coil? (pg.
1-13)
A) Reduced heat transfer
B) Increased operating cost
C) Increased 'U' value
D) Increased condensing temperatures - ANSWER-C) Increased 'U' value
If 'R' value is doubled, what will happen to the heat transfer rate (assuming the
temperature difference and the area do not change)? (pg. 1-13)
pg. 2
,A) The rate of heat that is transferred will be double
B) The rate of heat that is transferred will be cut in half
C) The rate of heat that is transferred does not change
D) The conductance is doubled so that heat transfer rate is increased - ANSWER-
B) The rate of heat that is transferred will be cut in half
What happens to the theoretical capacity of an evaporator in a 0°F freezer if the
ammonia evaporating pressure is dropped from 8.96 PSIG to 6.11 PSIG? (pg.
A) The capacity of the evaporator is reduced by 50%
B) The capacity of the evaporator is doubled
C) The capacity of the evaporator is not changed
D) The capacity of the evaporator is increased by 50% - ANSWER-C) The
capacity of the evaporator is not changed
Damaged insulation on the suction line in an ammonia refrigeration system will?
(pg. 1-14)
A) Not change the efficiency of the system because suction pressure will not
change
B) Cause efficiency loss and potential damage to the suction line
C) Look bad but will not cause any major problems
D) Cause an efficiency loss but will not cause any other problems - ANSWER-B)
Cause efficiency loss and potential damage to the suction line
Enthalpy is? (pg. 2-2)
A) A measure of total energy (heat content) per pound of refrigerant measured in
BTU's
B) The net heat absorbing capacity of the refrigerant after the point of expansion
C) The amount of cooling effect that can be obtained from a refrigeration system
pg. 3
, D) Heat that cannot be measured through a change in temperature - ANSWER-A)
A measure of total energy (heat content) per pound of refrigerant measured in
BTU's
The enthalpy diagram? (pg. 2-6)
A) Illustrates the changes of condition and heat content of a pound of refrigerant at
different points of the refrigeration cycle
B) Illustrates the total heat transfer capacity of the system from evaporators
through condensers in tons of refrigeration
C) Utilizes two scales, pressure and tons of refrigeration
D) Does not take into account the effect of flash gas - ANSWER-A) Illustrates the
changes of condition and heat content of a pound of refrigerant at different points
of the refrigeration cycle
The enthalpy diagram has three regions of refrigerant condition which are? (pg. 2-
10)
A) Solid, Liquid and Gas
B) Subcooled Liquid, SAT Liquid and Vapor, and Superheated Vapor
C) Hot, Medium, and Cold
D) Flash Gas, Subcooled Liquid, Subcooled Liquid and Flash Gas - ANSWER-B)
Subcooled Liquid, SAT Liquid and Vapor, and Superheated Vapor
The pressure scale on an enthalpy diagram typically used in the U.S. is expressed
in? (pg. 2-8)
A) Kilopascals
B) PSIG
C) PSIA
D) Newtons - ANSWER-C) PSIA
pg. 4
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