RETA Industrial Refrigeration Book 1 : Master
the Exam, Exams of Refrigeration and Air
Conditioning
As defined in Chapter one of this text, the primary purpose of a refrigeration system it to? (pg. 1-3)
A) To freeze food
B) To cool buildings
C) To preserve food
D) To maintain a temperature - ANSWER-D) To maintain a temperature
Operators must keep refrigeration systems operating safely and efficiently. Which of the following
best describes the areas of required knowledge for this to be possible? (pg. 1-4)
A) Basic physical principles, interpretation of information from temperature and pressure gauges,
basic operating principles
B) Basic physical principles, interpretation of information from temperature and pressure gauges,
manufacturer of the equipment
C) Interpretation of information from temperature and pressure gauges, basic operating principles,
company quality control policies and procedures
D) Interpretation of information from temperature and pressure gauges, manufacturer of the
equipment, company quality control policies and procedures - ANSWER-A) Basic physical principles,
interpretation of information from temperature and pressure gauges, basic operating principles
Mechanical refrigeration is a series of steps that? (pg. 1-2)
A) Moves heat energy from a space or object to an area where it can do no harm
B) Adds cold to a space or object
C) Transforms heat energy into cold energy to reduce the temperature of the area to be cooled
D) Utilizes the cooling effect of compressing a gas to reduce the temperature in a space or object -
ANSWER-A) Moves heat energy from a space or object to an area where it can do no harm
Heat energy always flows? (pg. 1-23)
A) From a substance with more heat energy [measured in BTUs] to a substance with less heat energy
[ measured in BTUs]
B) Regardless of temperature
C) From an object at a higher temperature to an object at a lower temperature
D) From a liquid to a vapor - ANSWER-C) From an object at a higher temperature to an object at a
lower temperature
Sensible heat? (pg. 1-22)
A) Is measured using a pressure gauge
B) Is always between 32°F and 212°F
C) Is heat energy that causes a change of state but does not cause a change in temperature
D) Is heat energy that causes a change in temperature but does not cause a change of state -
ANSWER-D) Is heat energy that causes a change in temperature but does not cause a change of state
Latent heat? (pg. 1-22)
A) Is measured using a pressure gauge
B) Can be sensed by using a thermometer
C) Is heat energy that causes a change of state but does not cause a change in temperature
D) Is heat energy that causes a change in temperature but does not cause a change of state -
ANSWER-C) Is heat energy that causes a change of state but does not cause a change in temperature
,Which of the answers below is an example of heat transfer by convection? (pg. 1-36)
A) The Sun's rays
B) A rod that is heat on one end resulting in a temperature change at the other end
C) Warm air moving over an object
D) Heat transferred to a pan setting on an electric hot plate - ANSWER-C) Warm air moving over an
object
How does the refrigeration technician/operator know what the conditions are within a refrigeration
system? (pg. 1-4)
A) By using his knowledge of system basic operating principles to evaluate temperature and pressure
readings
B) By observing the alarm annunciator panel, if no alarms are displayed the system is operating
efficiently and correctly
C) By keeping the discharge and suction pressures within specification the operator assures proper
system operationg
D) By observing product temperature, if the product is at temperature the system is operating
properly - ANSWER-A) By using his knowledge of system basic operating principles to evaluate
temperature and pressure readings
How is cooling accomplished by a mechanical refrigeration system? (pg. 1-2)
A) By just pumping ice water through a space
B) By just adding cold air
C) By removing heat energy from an object or area
D) By increasing the molecular vibration of an object - ANSWER-C) By removing heat energy from an
object or area
Which of the following is used to measure the quantity of heat energy? (pg. 1-21)
A) British Thermal Units (BTUs) or Calories
B) Pascals and Kilopascals
C) Degrees Kelvin
D) Degrees Celsius or Fahrenheit - ANSWER-A) British Thermal Units (BTUs) or Calories
Which of the following are used in heat calculations? (pg. 1-40
A) Mass, sensible heat, temperature, specific heat
B) Mass, latent heat, temperature, specific heat
C) Mass, sensible heat, heat of cooling, change of state
D) Mass, latent heat, temperature, heat of refrigeration - ANSWER-B) Mass, latent heat, temperature,
specific heat
Latent heat of vaporization? (pg. 1-22)
A) Is calculated using temperature
B) Is always going to raise the temperature of the liquid it is trying to boil
C) Is the heat energy required to cause a liquid to become a vapor
D) Is the same for all liquids - ANSWER-C) Is the heat energy required to cause a liquid to become a
vapor
Pressure is a measure of? (pg. 1-11)
A) The action seen from the attraction of gravity
B) Weight
C) The relationship of a force being applied over a given area
D) The distance between the top of the piston and the discharge valve of a reciprocating compressor -
ANSWER-C) The relationship of a force being applied over a given area
The relationship between temperature difference and heat flow is? (pg. 1-23)
A) There is no relationship between temperature and heat flow
B) The greater the temperature difference, the slower heat flows
C) The greater the temperature difference, the more rapid heat flows
,D) The more rapidly the heat flows the greater the temperature increases - ANSWER-C) The greater
the temperature difference, the more rapid heat flows
Specific heat? (pg. 1-29)
A) Is greater as the substance requires more heat energy to increase temperature
B) Is less as the substance requires more heat energy to increase temperature
C) Is 1 BTU/lb/degree Fahrenheit for all substances
D) Is related to change of state, not temperature change of a substance - ANSWER-A) Is greater as the
substance requires more heat energy to increase temperature
Temperature is a measure of? (pg. 1-18)
A) The latent heat of an object
B) Heat of fusion that has been absorbed by an object
C) Heat of vaporization
D) The intensity of the heat energy in an object - ANSWER-D) The intensity of the heat energy in an
object
If the force acting on an area of 5 square inches is 150 lbs., what is the pressure on the area? (pg. 1-11)
A) 30 lb/in2
B) 750 lb/in2
C) 155 lb/in2
D) 3750 lb/in2 - ANSWER-A) 30 lb/in2
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
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
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
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
A) 409 BTUs
A meat plant process 100 animals a day with an average processed weight of 750 pounds of beef per
animal. The meat must be cooled to 45°F from 85°F. How many BTUs must be removed in the cooling
process? (pg. 1-40)
A) 3,000,000 BTUs
B) 2,205,000 BTUs
C) 220,500 BTUs
D) 55,125 BTUs - ANSWER-Q = M x Cp x Change in Temp.
Q = (100 animals x 750lbs. x 0.735 x (85 - 45) = 2,205,000 BTUs
B) 2,205,000 BTUs
A vapor can NOT be? (pg. 1-30)
A) Compressed
B) Superheated
C) Subcooled
D) Saturated - ANSWER-C) Subcooled
What kind of a measure is a ton of refrigeration? (pg. 1-39)
A) An amount in pounds
B) A rate of heat transfer in BTUs per unit of time
C) A quantity in BTUs
D) A measure of energy in BTUs per pound - ANSWER-B) A rate of heat transfer in BTUs per unit of
time
How many degrees Fahrenheit is equal to -6.7 degrees Celsius? (pg. 1-19)
A) 32°F
B) 20°F
C) -20°F
D) -12°F - ANSWER-Fahrenheit = (9 x Celsius) / 5) + 32
Fahrenheit = (9 x -6.7)/5) + 32 = 20
B) 20°F
The condition of a liquid that exists at a temperature below its boiling point is? (pg. 2-12)
the Exam, Exams of Refrigeration and Air
Conditioning
As defined in Chapter one of this text, the primary purpose of a refrigeration system it to? (pg. 1-3)
A) To freeze food
B) To cool buildings
C) To preserve food
D) To maintain a temperature - ANSWER-D) To maintain a temperature
Operators must keep refrigeration systems operating safely and efficiently. Which of the following
best describes the areas of required knowledge for this to be possible? (pg. 1-4)
A) Basic physical principles, interpretation of information from temperature and pressure gauges,
basic operating principles
B) Basic physical principles, interpretation of information from temperature and pressure gauges,
manufacturer of the equipment
C) Interpretation of information from temperature and pressure gauges, basic operating principles,
company quality control policies and procedures
D) Interpretation of information from temperature and pressure gauges, manufacturer of the
equipment, company quality control policies and procedures - ANSWER-A) Basic physical principles,
interpretation of information from temperature and pressure gauges, basic operating principles
Mechanical refrigeration is a series of steps that? (pg. 1-2)
A) Moves heat energy from a space or object to an area where it can do no harm
B) Adds cold to a space or object
C) Transforms heat energy into cold energy to reduce the temperature of the area to be cooled
D) Utilizes the cooling effect of compressing a gas to reduce the temperature in a space or object -
ANSWER-A) Moves heat energy from a space or object to an area where it can do no harm
Heat energy always flows? (pg. 1-23)
A) From a substance with more heat energy [measured in BTUs] to a substance with less heat energy
[ measured in BTUs]
B) Regardless of temperature
C) From an object at a higher temperature to an object at a lower temperature
D) From a liquid to a vapor - ANSWER-C) From an object at a higher temperature to an object at a
lower temperature
Sensible heat? (pg. 1-22)
A) Is measured using a pressure gauge
B) Is always between 32°F and 212°F
C) Is heat energy that causes a change of state but does not cause a change in temperature
D) Is heat energy that causes a change in temperature but does not cause a change of state -
ANSWER-D) Is heat energy that causes a change in temperature but does not cause a change of state
Latent heat? (pg. 1-22)
A) Is measured using a pressure gauge
B) Can be sensed by using a thermometer
C) Is heat energy that causes a change of state but does not cause a change in temperature
D) Is heat energy that causes a change in temperature but does not cause a change of state -
ANSWER-C) Is heat energy that causes a change of state but does not cause a change in temperature
,Which of the answers below is an example of heat transfer by convection? (pg. 1-36)
A) The Sun's rays
B) A rod that is heat on one end resulting in a temperature change at the other end
C) Warm air moving over an object
D) Heat transferred to a pan setting on an electric hot plate - ANSWER-C) Warm air moving over an
object
How does the refrigeration technician/operator know what the conditions are within a refrigeration
system? (pg. 1-4)
A) By using his knowledge of system basic operating principles to evaluate temperature and pressure
readings
B) By observing the alarm annunciator panel, if no alarms are displayed the system is operating
efficiently and correctly
C) By keeping the discharge and suction pressures within specification the operator assures proper
system operationg
D) By observing product temperature, if the product is at temperature the system is operating
properly - ANSWER-A) By using his knowledge of system basic operating principles to evaluate
temperature and pressure readings
How is cooling accomplished by a mechanical refrigeration system? (pg. 1-2)
A) By just pumping ice water through a space
B) By just adding cold air
C) By removing heat energy from an object or area
D) By increasing the molecular vibration of an object - ANSWER-C) By removing heat energy from an
object or area
Which of the following is used to measure the quantity of heat energy? (pg. 1-21)
A) British Thermal Units (BTUs) or Calories
B) Pascals and Kilopascals
C) Degrees Kelvin
D) Degrees Celsius or Fahrenheit - ANSWER-A) British Thermal Units (BTUs) or Calories
Which of the following are used in heat calculations? (pg. 1-40
A) Mass, sensible heat, temperature, specific heat
B) Mass, latent heat, temperature, specific heat
C) Mass, sensible heat, heat of cooling, change of state
D) Mass, latent heat, temperature, heat of refrigeration - ANSWER-B) Mass, latent heat, temperature,
specific heat
Latent heat of vaporization? (pg. 1-22)
A) Is calculated using temperature
B) Is always going to raise the temperature of the liquid it is trying to boil
C) Is the heat energy required to cause a liquid to become a vapor
D) Is the same for all liquids - ANSWER-C) Is the heat energy required to cause a liquid to become a
vapor
Pressure is a measure of? (pg. 1-11)
A) The action seen from the attraction of gravity
B) Weight
C) The relationship of a force being applied over a given area
D) The distance between the top of the piston and the discharge valve of a reciprocating compressor -
ANSWER-C) The relationship of a force being applied over a given area
The relationship between temperature difference and heat flow is? (pg. 1-23)
A) There is no relationship between temperature and heat flow
B) The greater the temperature difference, the slower heat flows
C) The greater the temperature difference, the more rapid heat flows
,D) The more rapidly the heat flows the greater the temperature increases - ANSWER-C) The greater
the temperature difference, the more rapid heat flows
Specific heat? (pg. 1-29)
A) Is greater as the substance requires more heat energy to increase temperature
B) Is less as the substance requires more heat energy to increase temperature
C) Is 1 BTU/lb/degree Fahrenheit for all substances
D) Is related to change of state, not temperature change of a substance - ANSWER-A) Is greater as the
substance requires more heat energy to increase temperature
Temperature is a measure of? (pg. 1-18)
A) The latent heat of an object
B) Heat of fusion that has been absorbed by an object
C) Heat of vaporization
D) The intensity of the heat energy in an object - ANSWER-D) The intensity of the heat energy in an
object
If the force acting on an area of 5 square inches is 150 lbs., what is the pressure on the area? (pg. 1-11)
A) 30 lb/in2
B) 750 lb/in2
C) 155 lb/in2
D) 3750 lb/in2 - ANSWER-A) 30 lb/in2
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
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
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
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
A) 409 BTUs
A meat plant process 100 animals a day with an average processed weight of 750 pounds of beef per
animal. The meat must be cooled to 45°F from 85°F. How many BTUs must be removed in the cooling
process? (pg. 1-40)
A) 3,000,000 BTUs
B) 2,205,000 BTUs
C) 220,500 BTUs
D) 55,125 BTUs - ANSWER-Q = M x Cp x Change in Temp.
Q = (100 animals x 750lbs. x 0.735 x (85 - 45) = 2,205,000 BTUs
B) 2,205,000 BTUs
A vapor can NOT be? (pg. 1-30)
A) Compressed
B) Superheated
C) Subcooled
D) Saturated - ANSWER-C) Subcooled
What kind of a measure is a ton of refrigeration? (pg. 1-39)
A) An amount in pounds
B) A rate of heat transfer in BTUs per unit of time
C) A quantity in BTUs
D) A measure of energy in BTUs per pound - ANSWER-B) A rate of heat transfer in BTUs per unit of
time
How many degrees Fahrenheit is equal to -6.7 degrees Celsius? (pg. 1-19)
A) 32°F
B) 20°F
C) -20°F
D) -12°F - ANSWER-Fahrenheit = (9 x Celsius) / 5) + 32
Fahrenheit = (9 x -6.7)/5) + 32 = 20
B) 20°F
The condition of a liquid that exists at a temperature below its boiling point is? (pg. 2-12)
