RETA INDUSTRIAL REFRIGERATION BOOK 2
EXAM COMPREHENSIVE QUESTIONS WITH
MULTIPLE CHOICES |VERIFIED & REVISED
ANSWERS
Which of the following factors listed below does not affect heat transfer?
(pg. 1-2)
A) Temperature Difference
B) Surface Area
C) Thermal Conductivity
D) Density - ✔✔D) Density
An example of a poor conductor of heat is? (pg. 1-3)
A) Aluminum Tubing
©morren 2025/2026. Year published 2026.
,B) Schedule 40 Steel Pipe
C) Wood
D) Water - ✔✔C) Wood
Thermal conductivity ('K') is? (pg. 1-3)
A) Exactly the same for any metal
B) The number of BTU's that will pass in 1 hour through a material 1" thick
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 - ✔✔B)
The number of BTU's that will pass in 1 hour through a material 1" thick with
an area of 1 sq. ft. if the temperature difference from one side to the other is
1°F
©morren 2025/2026. Year published 2026.
,Which is NOT a common source of fouling of a heat exchange surface?
(pg. 1-7)
A) Water
B) Oil
C) Frost
D) Dirt - ✔✔A) Water
Which statement is true? (pg. 1-3)
A) The higher the 'k' factor, the 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 - ✔✔A) The
higher the 'k' factor, the greater the thermal conductivity
Optimum 'U' factor for the given material that the heat exchanger is made
of results when? (pg. 1-7/8)
©morren 2025/2026. Year published 2026.
, 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 - ✔✔A) There is no impeding
substance such as ice, dirt, or oil on the surfaces of the heat exchanger
tubes
When air flow is decreased across a 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 - ✔✔A)
Reduced
Centrifugal fans have an advantage over propeller fans in that they
______________ than prop fans? (pg. 1-12)
©morren 2025/2026. Year published 2026.
EXAM COMPREHENSIVE QUESTIONS WITH
MULTIPLE CHOICES |VERIFIED & REVISED
ANSWERS
Which of the following factors listed below does not affect heat transfer?
(pg. 1-2)
A) Temperature Difference
B) Surface Area
C) Thermal Conductivity
D) Density - ✔✔D) Density
An example of a poor conductor of heat is? (pg. 1-3)
A) Aluminum Tubing
©morren 2025/2026. Year published 2026.
,B) Schedule 40 Steel Pipe
C) Wood
D) Water - ✔✔C) Wood
Thermal conductivity ('K') is? (pg. 1-3)
A) Exactly the same for any metal
B) The number of BTU's that will pass in 1 hour through a material 1" thick
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 - ✔✔B)
The number of BTU's that will pass in 1 hour through a material 1" thick with
an area of 1 sq. ft. if the temperature difference from one side to the other is
1°F
©morren 2025/2026. Year published 2026.
,Which is NOT a common source of fouling of a heat exchange surface?
(pg. 1-7)
A) Water
B) Oil
C) Frost
D) Dirt - ✔✔A) Water
Which statement is true? (pg. 1-3)
A) The higher the 'k' factor, the 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 - ✔✔A) The
higher the 'k' factor, the greater the thermal conductivity
Optimum 'U' factor for the given material that the heat exchanger is made
of results when? (pg. 1-7/8)
©morren 2025/2026. Year published 2026.
, 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 - ✔✔A) There is no impeding
substance such as ice, dirt, or oil on the surfaces of the heat exchanger
tubes
When air flow is decreased across a 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 - ✔✔A)
Reduced
Centrifugal fans have an advantage over propeller fans in that they
______________ than prop fans? (pg. 1-12)
©morren 2025/2026. Year published 2026.
