RETA CARO Exam Questions With Answers
What is the purpose of a refrigeration system?
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?
Basic physical principles, interpretation of information from temperature and pressure gauges, basic
operating principles.
Mechanical refrigeration is a series of steps that:
Moves heat energy from a space or object to an area where it can do no harm.
Heat energy always flows:
from an object at a higher temperature to an object at a lower temperature
Sensible heat:
is heat energy that causes a change in temperature but does not cause a change of state.
Latent heat:
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?
Warm air moving over an object.
How does the refrigeration technician/operator know what the conditions are within a refrigeration
system?
By using his knowledge of system basic operating principles to evaluate temperature and pressure
readings.
What is the scale used to measure Fahrenheit temperature absolute?
Rankine
Which of the following is used to measure the quantity of heat energy?
British Thermal Units (BTUS) or calories.
When calculating the BTUS that have to be removed to cool a substance, what combination of the
following is used?
pounds of substance, temperature difference, specific heat
Latent heat of vaporization
is the heat energy required to cause a liquid to become a vapor.
Pressure is a measure of
the relationship of a force being applied over a given area.
What is the purpose of a refrigeration system?
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?
Basic physical principles, interpretation of information from temperature and pressure gauges, basic
operating principles.
Mechanical refrigeration is a series of steps that:
Moves heat energy from a space or object to an area where it can do no harm.
Heat energy always flows:
from an object at a higher temperature to an object at a lower temperature
Sensible heat:
is heat energy that causes a change in temperature but does not cause a change of state.
Latent heat:
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?
Warm air moving over an object.
How does the refrigeration technician/operator know what the conditions are within a refrigeration
system?
By using his knowledge of system basic operating principles to evaluate temperature and pressure
readings.
What is the scale used to measure Fahrenheit temperature absolute?
Rankine
Which of the following is used to measure the quantity of heat energy?
British Thermal Units (BTUS) or calories.
When calculating the BTUS that have to be removed to cool a substance, what combination of the
following is used?
pounds of substance, temperature difference, specific heat
Latent heat of vaporization
is the heat energy required to cause a liquid to become a vapor.
Pressure is a measure of
the relationship of a force being applied over a given area.
