Reta Industrial Refrigeration Book 2 EXAM
COMPREHENSIVE QUESTIONS WITH MULTIPLE
CHOICES |VERIFIED & REVISED ANSWERS (NEW)
2026
Save
Terms in this set (265)
Which of the following factors listed D) Density
below does not affect heat transfer?
(pg. 1-2)
A) Temperature Difference
B) Surface Area
C) Thermal Conductivity
D) Density
An example of a poor conductor of C) Wood
heat is? (pg. 1-3)
A) Aluminum Tubing
B) Schedule 40 Steel Pipe
C) Wood
D) Water
,Thermal conductivity ('K') is? (pg. 1-3) B) The number of BTU's that will pass in 1 hour
A) Exactly the same for any metal through a material 1" thick with an area of 1 sq. ft. if
B) The number of BTU's that will pass the temperature difference from one side to the
in 1 hour through a material 1" thick other is 1°F
with an area of 1 sq. ft. if the
temperature difference from one
side to the other is 1°F
C) A measure of the total energy
(heat content) per pound of
refrigerant measured in BTU's
D) A relationship between heat and
temperature that is useful in
determining discharge temperatures.
It is heat moved into or out of the
process, divided by the absolute
temperature in BTU's/pound/R
Which is NOT a common source of A) Water
fouling of a heat exchange surface?
(pg. 1-7)
A) Water
B) Oil
C) Frost
D) Dirt
Which statement is true? (pg. 1-3) A) The higher the 'k' factor, the greater the thermal
A) The higher the 'k' factor, the conductivity
greater the thermal conductivity
B) The lower the 'k' factor, the greater
the thermal conductivity
C) The higher the 'k' factor, the lower
the thermal conductivity
D) The 'k' factor is not associated
with thermal conductivity
,Optimum 'U' factor for the given A) There is no impeding substance such as ice, dirt,
material that the heat exchanger is or oil on the surfaces of the heat exchanger tubes
made of results when? (pg. 1-7/8)
A) There is no impeding substance
such as ice, dirt, or oil on the
surfaces of the heat exchanger tubes
B) Maximum airflow across the
evaporator is achieved
C) The system is operating with the
design recirculation low
D) The system is maintaining
temperature
When air flow is decreased across a A) Reduced
heat exchange surface, cooling
capacity is? (pg. 1-10)
A) Reduced
B) Increased
C) Not changed because area is not
changed
D) Not changed because evaporator
temperature is not changed
Centrifugal fans have an advantage C) Are quieter
over propeller fans in that they
______________ than prop fans? (pg. 1-12)
A) Require less physical space
B) Consume more hp per CFM of air
moved
C) Are quieter
D) Have fewer components to
maintain
, The operating engineer? (pg. 1-7) A) Cannot change the 'k' factor of the metal but has
A) Cannot change the 'k' factor of some control of the overall 'U' factor for the
the metal but has some control of evaporator as a unit
the overall 'U' factor for the
evaporator as a unit
B) Can increase 'k' factor by
increasing the air velocity over the
evaporator and has some control of
the overall 'U' factor for the
evaporator as a unit
C) Should allow frost to collect on
the evaporator increase 'k' factor
D) Can increase 'k' factor by starting
another compressor
The limiting factor of an evaporator's C) Evaporator Size
capacity that the operator cannot
control is? (pg. 1-7)
A) Suction Temperature
B) Suction Pressure
C) Evaporator Size
D) Refrigerant Liquid Feed Flow
The best way to keep an evaporator B) Periodically remove oil from the oil collection
from being affected by oil build-up is points
to? (pg. 1-8)
A) Operate the system at the correct
evaporator temperature
B) Periodically remove oil from the
oil collection points
C) Set hot gas defrost cycle for a
minimum of 30 minutes
D) Increase air flow across the
evaporators
COMPREHENSIVE QUESTIONS WITH MULTIPLE
CHOICES |VERIFIED & REVISED ANSWERS (NEW)
2026
Save
Terms in this set (265)
Which of the following factors listed D) Density
below does not affect heat transfer?
(pg. 1-2)
A) Temperature Difference
B) Surface Area
C) Thermal Conductivity
D) Density
An example of a poor conductor of C) Wood
heat is? (pg. 1-3)
A) Aluminum Tubing
B) Schedule 40 Steel Pipe
C) Wood
D) Water
,Thermal conductivity ('K') is? (pg. 1-3) B) The number of BTU's that will pass in 1 hour
A) Exactly the same for any metal through a material 1" thick with an area of 1 sq. ft. if
B) The number of BTU's that will pass the temperature difference from one side to the
in 1 hour through a material 1" thick other is 1°F
with an area of 1 sq. ft. if the
temperature difference from one
side to the other is 1°F
C) A measure of the total energy
(heat content) per pound of
refrigerant measured in BTU's
D) A relationship between heat and
temperature that is useful in
determining discharge temperatures.
It is heat moved into or out of the
process, divided by the absolute
temperature in BTU's/pound/R
Which is NOT a common source of A) Water
fouling of a heat exchange surface?
(pg. 1-7)
A) Water
B) Oil
C) Frost
D) Dirt
Which statement is true? (pg. 1-3) A) The higher the 'k' factor, the greater the thermal
A) The higher the 'k' factor, the conductivity
greater the thermal conductivity
B) The lower the 'k' factor, the greater
the thermal conductivity
C) The higher the 'k' factor, the lower
the thermal conductivity
D) The 'k' factor is not associated
with thermal conductivity
,Optimum 'U' factor for the given A) There is no impeding substance such as ice, dirt,
material that the heat exchanger is or oil on the surfaces of the heat exchanger tubes
made of results when? (pg. 1-7/8)
A) There is no impeding substance
such as ice, dirt, or oil on the
surfaces of the heat exchanger tubes
B) Maximum airflow across the
evaporator is achieved
C) The system is operating with the
design recirculation low
D) The system is maintaining
temperature
When air flow is decreased across a A) Reduced
heat exchange surface, cooling
capacity is? (pg. 1-10)
A) Reduced
B) Increased
C) Not changed because area is not
changed
D) Not changed because evaporator
temperature is not changed
Centrifugal fans have an advantage C) Are quieter
over propeller fans in that they
______________ than prop fans? (pg. 1-12)
A) Require less physical space
B) Consume more hp per CFM of air
moved
C) Are quieter
D) Have fewer components to
maintain
, The operating engineer? (pg. 1-7) A) Cannot change the 'k' factor of the metal but has
A) Cannot change the 'k' factor of some control of the overall 'U' factor for the
the metal but has some control of evaporator as a unit
the overall 'U' factor for the
evaporator as a unit
B) Can increase 'k' factor by
increasing the air velocity over the
evaporator and has some control of
the overall 'U' factor for the
evaporator as a unit
C) Should allow frost to collect on
the evaporator increase 'k' factor
D) Can increase 'k' factor by starting
another compressor
The limiting factor of an evaporator's C) Evaporator Size
capacity that the operator cannot
control is? (pg. 1-7)
A) Suction Temperature
B) Suction Pressure
C) Evaporator Size
D) Refrigerant Liquid Feed Flow
The best way to keep an evaporator B) Periodically remove oil from the oil collection
from being affected by oil build-up is points
to? (pg. 1-8)
A) Operate the system at the correct
evaporator temperature
B) Periodically remove oil from the
oil collection points
C) Set hot gas defrost cycle for a
minimum of 30 minutes
D) Increase air flow across the
evaporators
