CARO BOOK QUESTION AND
ANSWERS 2025/2026
What is the purpose of a refrigeration system
A. To freeze food
B. To cool buildings
C. To preserve food
D. To maintain a temperature - ANSWERSD. 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?
A. Basic physical principles, interpretation of information from temperature and pressure
guages. Basic operating principles.
B. Basic physical principles, interpretation of information from temperature and pressure
guages. Manufacturer of the equipment
C. Interpretation of information from temperature and pressure guages. Basic operating
principles, company quality control policies and procedures. - ANSWERSA. Basic
physical principles, Interpreparation of information from temperature and pressure
gauges. Basic operating principles.
Mechanical refrigeration is a series of steps that
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 - ANSWERSA. Moves heat energy from a space or object to an area where it
can do no harm
Heat energy always flows
A. From a substance with more heat energy to a substance with less heat energy
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 - ANSWERSC. From an object at a higher temperature to an
object at a lower temperature
Sensible heat
A. Is measured using a pressure guage
B. Is always between 32 and 212 degrees Fahrenheit
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 - ANSWERSIs heat energy that causes a change in temperature but does not
cause a change of state
latent heat
A. Is measured using a pressure guage
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 - ANSWERSC. Is heat energy that causes a change of state but does not cause a
change of state
Which of the answers below is an example of heat transfer by convection
A. The suns rays hitting roof
B. A rod that is heated on one end resulting in a temperature change at the other end
C. Warm air rising and cold air falling
D. Heat transferred to a pan setting on an electric hot plate - ANSWERSC. Warm air
rising and cold air falling
How does the refrigeration technician/operator know what the conditions are within a
refrigeration system - ANSWERSBy using his knowledge of system basic operating
principles to evaluate temperature and pressure readings
What is the scale used to measure Fahrenheit temperature absolute
A. Extreme
B. Rankine
C. Celsius
D. Kelvin - ANSWERSB. Rankine
Which of the following is used to measure the quantity of heat energy
A. British Thermal Units
B. Pascals and Kilopascals
C. Degrees Kelvin
D. Degrees Celsius or Fahrenheit - ANSWERSA. British Thermal Units
When calculating the BTU's that have to be removed to change temperature of a
substance, what combination of the following is used?
A. Pounds of substance, sensible heat, temperature
B. Pounds of substance, temperature difference, specific heat
C. Pounds of substance, heat of cooling, change of state
D. Pounds of substance, latent heat, heat of refrigeration - ANSWERSB. Pounds of
substance, temperature difference, specific heat
latent heat of vaporization
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 - ANSWERSIs the heat energy required to cause a liquid to
become a vapor
Pressure is a measure of
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 post on and the discharge valve of a
reciprocating compressor - ANSWERSC. The relationship of a force being applied over
a given area
What is the relationship between temperature difference and heat flow
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 the heat flows
D. The more rapidly the heat flows, the greater the temperature increases -
ANSWERSC. The greater the temperature difference, the more rapid the heat flows
Specific heat
A. Is greater if the substance requires more heat energy to increase the temperature
B. Is less than 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 - ANSWERSA.
Is greater if the substance requires more heat energy to increase the temperature
Temperature is a measure of
A. The latent heat of an object
B. Heat fusion that has been absorbed by an object
C. Heat of vaporization
D. The intensity of the heat energy in an object - ANSWERSD. The intensity of the heat
energy in an object
If the force acting on an area of 5 square inches is 150lb., what is the pressure on the
area
A. 30lb/in2
B. 750 lb/in2
C. 155 lb/in2
D. 3750 lb/in2 - ANSWERSA. 30lb/in2
Using the vapor pressure curve for ammonia, 70deg equals what value
A. 38psig
B. 40psia
C. 70psig
D. 114psig - ANSWERSD. 114psig
ANSWERS 2025/2026
What is the purpose of a refrigeration system
A. To freeze food
B. To cool buildings
C. To preserve food
D. To maintain a temperature - ANSWERSD. 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?
A. Basic physical principles, interpretation of information from temperature and pressure
guages. Basic operating principles.
B. Basic physical principles, interpretation of information from temperature and pressure
guages. Manufacturer of the equipment
C. Interpretation of information from temperature and pressure guages. Basic operating
principles, company quality control policies and procedures. - ANSWERSA. Basic
physical principles, Interpreparation of information from temperature and pressure
gauges. Basic operating principles.
Mechanical refrigeration is a series of steps that
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 - ANSWERSA. Moves heat energy from a space or object to an area where it
can do no harm
Heat energy always flows
A. From a substance with more heat energy to a substance with less heat energy
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 - ANSWERSC. From an object at a higher temperature to an
object at a lower temperature
Sensible heat
A. Is measured using a pressure guage
B. Is always between 32 and 212 degrees Fahrenheit
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 - ANSWERSIs heat energy that causes a change in temperature but does not
cause a change of state
latent heat
A. Is measured using a pressure guage
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 - ANSWERSC. Is heat energy that causes a change of state but does not cause a
change of state
Which of the answers below is an example of heat transfer by convection
A. The suns rays hitting roof
B. A rod that is heated on one end resulting in a temperature change at the other end
C. Warm air rising and cold air falling
D. Heat transferred to a pan setting on an electric hot plate - ANSWERSC. Warm air
rising and cold air falling
How does the refrigeration technician/operator know what the conditions are within a
refrigeration system - ANSWERSBy using his knowledge of system basic operating
principles to evaluate temperature and pressure readings
What is the scale used to measure Fahrenheit temperature absolute
A. Extreme
B. Rankine
C. Celsius
D. Kelvin - ANSWERSB. Rankine
Which of the following is used to measure the quantity of heat energy
A. British Thermal Units
B. Pascals and Kilopascals
C. Degrees Kelvin
D. Degrees Celsius or Fahrenheit - ANSWERSA. British Thermal Units
When calculating the BTU's that have to be removed to change temperature of a
substance, what combination of the following is used?
A. Pounds of substance, sensible heat, temperature
B. Pounds of substance, temperature difference, specific heat
C. Pounds of substance, heat of cooling, change of state
D. Pounds of substance, latent heat, heat of refrigeration - ANSWERSB. Pounds of
substance, temperature difference, specific heat
latent heat of vaporization
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 - ANSWERSIs the heat energy required to cause a liquid to
become a vapor
Pressure is a measure of
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 post on and the discharge valve of a
reciprocating compressor - ANSWERSC. The relationship of a force being applied over
a given area
What is the relationship between temperature difference and heat flow
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 the heat flows
D. The more rapidly the heat flows, the greater the temperature increases -
ANSWERSC. The greater the temperature difference, the more rapid the heat flows
Specific heat
A. Is greater if the substance requires more heat energy to increase the temperature
B. Is less than 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 - ANSWERSA.
Is greater if the substance requires more heat energy to increase the temperature
Temperature is a measure of
A. The latent heat of an object
B. Heat fusion that has been absorbed by an object
C. Heat of vaporization
D. The intensity of the heat energy in an object - ANSWERSD. The intensity of the heat
energy in an object
If the force acting on an area of 5 square inches is 150lb., what is the pressure on the
area
A. 30lb/in2
B. 750 lb/in2
C. 155 lb/in2
D. 3750 lb/in2 - ANSWERSA. 30lb/in2
Using the vapor pressure curve for ammonia, 70deg equals what value
A. 38psig
B. 40psia
C. 70psig
D. 114psig - ANSWERSD. 114psig
