RETA INDUSTRIAL REFRIGERATION BOOK 2
EXAM COMPREHENSIVE QUESTIONS WITH
MULTIPLE CHOICES VERIFIED & REVISED
ANSWERS (NEW) 2025
1. 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
Answer D) Density
2. An example of a poor conductor of heat is? (pg. 1-3)
A) Aluminum Tubing
B) Schedule 40 Steel Pipe
C) Wood
,D) Water
Answer C) Wood
3. 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
Answer 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 ditterence from one side to the other is 1°F
4. Which is NOT a common source of fouling of a heat exchange surface?
,(pg. 1-7)
A) Water
B) Oil
C) Frost
D) Dirt
Answer A) Water
5. 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
Answer A) The higher the 'k' factor, the greater the thermal conductivity
6. Optimum 'U' factor for the given material that the heat exchanger is 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
Answer A) There is no impeding substance such as ice, dirt, or oil on the surfaces of the heat
exchanger tubes
7. When air flow is decreased across a heat exchange surface, cooling capacity
is? (pg. 1-10)
A) Reduced
EXAM COMPREHENSIVE QUESTIONS WITH
MULTIPLE CHOICES VERIFIED & REVISED
ANSWERS (NEW) 2025
1. 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
Answer D) Density
2. An example of a poor conductor of heat is? (pg. 1-3)
A) Aluminum Tubing
B) Schedule 40 Steel Pipe
C) Wood
,D) Water
Answer C) Wood
3. 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
Answer 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 ditterence from one side to the other is 1°F
4. Which is NOT a common source of fouling of a heat exchange surface?
,(pg. 1-7)
A) Water
B) Oil
C) Frost
D) Dirt
Answer A) Water
5. 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
Answer A) The higher the 'k' factor, the greater the thermal conductivity
6. Optimum 'U' factor for the given material that the heat exchanger is 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
Answer A) There is no impeding substance such as ice, dirt, or oil on the surfaces of the heat
exchanger tubes
7. When air flow is decreased across a heat exchange surface, cooling capacity
is? (pg. 1-10)
A) Reduced
