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RETA Industrial Refrigeration Book 1 Exam
Questions With Detailed Verified Answers|
Latest Update
Using the vapor pressure curve for ammonia, 70°F equals
approximately? (pg. 1-33)
A) 38 PSIG
B) 40 PSIG
C) 70 PSIG
D) 114 PSIG Answer: D) 114 psig
Thirty-two PSIA equals? (pg. 1-15)
A) 46.7 PSIG
B) 17.3 PSIG
C) 3.2 in. Hg
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D) 760 mm Hg Answer: B) 17.3 psig
The pressure midway between 0 PSIA and 0 PSIG is? (pg. 1-17)
A) 7.35 PSIA
B) 7.35 PSIG
C) 7.35 in. Hg
D) 0 in. Hg Answer: A) 7.35 PSIA
Which of the answers below is an example of heat transfer by
conduction? (pg. 1-35)
A) The sun's rays
B) A rod heated on one end becoming warm at the other end
C) Product being frozen in a blast freezer
D) Heat felt from a campfire when standing upwind
Answer: B) A rod heated on one end becoming warm at the other
end
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Which answer below represents the two most common forms of
heat transfer in refrigeration? (pg. 1-36)
A) Conduction and radiation
B) Conduction and convection
C) Convection and radiation
D) Conduction and sensible heat Answer: B) Conduction and
convection
If specific heat for air is 0.24 BTU/lb/°F and the specific volume is
12.7 cubic feet/lb., how much heat energy must be removed to cool
the air in a room that is 16' x 12' x 8' from 70°F to 40°F? (pg. 1-40)
A) 121 BTUs
B) 1536 BTUs
C) 29 BTUs
D) 871 BTUs Answer: Room Volume: (16 x 12 x 8) = 1536 cubic feet
Total pounds of air: (total room volume/specific volume of air
Total pounds of air: (.7) = 121 pounds of air
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Sensible Heat Equation: M x Cp x Temp. Change
Sensible Heat Equation: 121 x 0.24 x (70-40) = 871 BTUs
D) 871 BTUs
The condition of boiling liquid is? (pg. 1-30)
A) Always hot
B) Always superheated
C) Subcooled
D) Saturated Answer: D) Saturated
A gallon of milk weights 8 pounds. If it leaves the cow at 90°F and
must be cooled to 35°F, how many BTUs must be removed in the
cooling process? (pg. 1-40)
A) 409 BTUs
B) 40.9 BTUs
C) 440 BTUs
D) 51.15 BTUs Answer: Q = M x Cp x Change in Temp.
Q = 8 x 0.93 x 55 = 409 BTUs
RETA Industrial Refrigeration Book 1 Exam
Questions With Detailed Verified Answers|
Latest Update
Using the vapor pressure curve for ammonia, 70°F equals
approximately? (pg. 1-33)
A) 38 PSIG
B) 40 PSIG
C) 70 PSIG
D) 114 PSIG Answer: D) 114 psig
Thirty-two PSIA equals? (pg. 1-15)
A) 46.7 PSIG
B) 17.3 PSIG
C) 3.2 in. Hg
,2|Page
D) 760 mm Hg Answer: B) 17.3 psig
The pressure midway between 0 PSIA and 0 PSIG is? (pg. 1-17)
A) 7.35 PSIA
B) 7.35 PSIG
C) 7.35 in. Hg
D) 0 in. Hg Answer: A) 7.35 PSIA
Which of the answers below is an example of heat transfer by
conduction? (pg. 1-35)
A) The sun's rays
B) A rod heated on one end becoming warm at the other end
C) Product being frozen in a blast freezer
D) Heat felt from a campfire when standing upwind
Answer: B) A rod heated on one end becoming warm at the other
end
,3|Page
Which answer below represents the two most common forms of
heat transfer in refrigeration? (pg. 1-36)
A) Conduction and radiation
B) Conduction and convection
C) Convection and radiation
D) Conduction and sensible heat Answer: B) Conduction and
convection
If specific heat for air is 0.24 BTU/lb/°F and the specific volume is
12.7 cubic feet/lb., how much heat energy must be removed to cool
the air in a room that is 16' x 12' x 8' from 70°F to 40°F? (pg. 1-40)
A) 121 BTUs
B) 1536 BTUs
C) 29 BTUs
D) 871 BTUs Answer: Room Volume: (16 x 12 x 8) = 1536 cubic feet
Total pounds of air: (total room volume/specific volume of air
Total pounds of air: (.7) = 121 pounds of air
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Sensible Heat Equation: M x Cp x Temp. Change
Sensible Heat Equation: 121 x 0.24 x (70-40) = 871 BTUs
D) 871 BTUs
The condition of boiling liquid is? (pg. 1-30)
A) Always hot
B) Always superheated
C) Subcooled
D) Saturated Answer: D) Saturated
A gallon of milk weights 8 pounds. If it leaves the cow at 90°F and
must be cooled to 35°F, how many BTUs must be removed in the
cooling process? (pg. 1-40)
A) 409 BTUs
B) 40.9 BTUs
C) 440 BTUs
D) 51.15 BTUs Answer: Q = M x Cp x Change in Temp.
Q = 8 x 0.93 x 55 = 409 BTUs
