INDUSTRIAL REFRIGERATION EXAM STUDY SET WITH QUESTIONS
AND CORRECT ANSWERS 100% VERIFIED 2026-2027!!
As defined in chapter 1 of this text the primary purpose of refrigeration system is
- ANSWER 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. - ANSWER Basic physical principles, Interpreparation of information
from temperature and pressure gauges. Basic operating principles.
Mechanical refrigeration is a series of steps that - ANSWER moves heat energy
from the space or object to an area where It can do no harm.
Heat energy always flows - ANSWER From an object at a higher temperature to an
object at a lower temperature
sensible heat - ANSWER Is heat energy that causes a change in temperature but
does not cause a change of state
Latent heat - ANSWER 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 -
ANSWER Warm air moving over an object
How does the refrigeration technician/operator know what the conditions are
within the refrigeration system - ANSWER By using his knowledge of system
basic operating principles to evaluate temperature and pressure readings
How was cooling accomplished by mechanical refrigeration system - ANSWER
By removing heat energy from one object or area
Which of the following is used to measure the quality of heat energy - ANSWER
British thermal units BTUs or calories.
Which of the following are used in heat calculations - ANSWER Mass, latent heat,
temperature, specific heat.
Latent heat of vaporization - ANSWER Is the heat energy required to cause a
liquid to become a vapor
Pressure is A measure of - ANSWER The relationship of a force being applied
over a given area
,The relationship between temperature difference in heat flow is - ANSWER The
greater the temperature difference the more rapid the heat flows
Specific heat - ANSWER Is greater as a substance requires more heat energy to
increase temperature
Temperature is a measure of - ANSWER The intensity of heat energy in an object
Which of the answers below is an example of heat transferred by conduction -
ANSWER A rod heated on one end and becoming warm at the other end.
Which are the two most common forms of heat transfer in refrigeration - ANSWER
Conduction and convection
The condition of a boiling liquid is - ANSWER Saturated
A vapor cannot be - ANSWER Subcooled
What kind of measure is a ton of refrigeration - ANSWER A rate of heat
transferred in BTUs per unit of time
The condition of a liquid that exist at a temperature below its boiling point is -
ANSWER Sub cooled
Which does the refrigerant in the condenser change State from vapor to a liquid -
ANSWER The refrigerant loses heat energy to the sub rounding environment
The expansion valve controls only one of its items below which is it - ANSWER
The flow of liquid into the evaporator
Flash gas is - ANSWER Only the gas created at the expansion device
Which is a example of pressure drop - ANSWER The loss of pressure as a fluid
moves down the pipe due to the interaction of the fluid in the inner walls of the
pipe
Refrigerant absorbs the most heat when - ANSWER Changing from a liquid to a
vapor
The latent heat of condensation of a substance is exactly the same quality as -
ANSWER The latent heat of evaporation of the substance
Saturated conditions exist - ANSWER At some point within an evaporator and
condenser
Flash gas - ANSWER Is formed after the point of expansion
, The four necessary components of a mechanical refrigeration system are -
ANSWER Expansion device, evaporator, compressor, condenser
A conventional mechanical refrigeration system is considered - ANSWER A
closed loop system
Super heat is found at which point of a typical system - ANSWER The compressor
suction and compressor discharge line
In an operating ammonia refrigeration system, subcooled refrigerant can only be
a - ANSWER Liquid
Superheated refrigerant can only be a - ANSWER Vapor
Saturated refrigerant can - ANSWER Be a liquid, vapor or a combination of the
two
What is needed to get a fluid to flow - ANSWER A pressure difference
What is one advantage to having evaporator pressures higher than atmospheric
pressure - ANSWER Higher pressures keep air out of the system
R 507 is a/an - ANSWER Azeotrope
what do you multiply times the mass flow rate to determine the vapor flow rate
through the compressor - ANSWER Specific volume cubic feet/lb
Three factors to consider when choosing a refrigerant - ANSWER Cost,
availability, and safety
According to this text, trapped ammonia liquid results and how much pressure
change? - ANSWER 100 to 150 PSI per degree Fahrenheit increase
One positive characteristic of halocarbon refrigerants is - ANSWER They are
usually not explosive
A slight leak in a fitting on a HCFC/22 system causes the Halide torch flame to -
ANSWER Turn green
If the reciprocating Systems evaporator temperature is decreased, what happens
to the compressor theoretical discharge temperature? - ANSWER Discharge
temperature rises
Which refrigerant requires the largest compressor displacement per ton? -
ANSWER R-134a
AND CORRECT ANSWERS 100% VERIFIED 2026-2027!!
As defined in chapter 1 of this text the primary purpose of refrigeration system is
- ANSWER 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. - ANSWER Basic physical principles, Interpreparation of information
from temperature and pressure gauges. Basic operating principles.
Mechanical refrigeration is a series of steps that - ANSWER moves heat energy
from the space or object to an area where It can do no harm.
Heat energy always flows - ANSWER From an object at a higher temperature to an
object at a lower temperature
sensible heat - ANSWER Is heat energy that causes a change in temperature but
does not cause a change of state
Latent heat - ANSWER 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 -
ANSWER Warm air moving over an object
How does the refrigeration technician/operator know what the conditions are
within the refrigeration system - ANSWER By using his knowledge of system
basic operating principles to evaluate temperature and pressure readings
How was cooling accomplished by mechanical refrigeration system - ANSWER
By removing heat energy from one object or area
Which of the following is used to measure the quality of heat energy - ANSWER
British thermal units BTUs or calories.
Which of the following are used in heat calculations - ANSWER Mass, latent heat,
temperature, specific heat.
Latent heat of vaporization - ANSWER Is the heat energy required to cause a
liquid to become a vapor
Pressure is A measure of - ANSWER The relationship of a force being applied
over a given area
,The relationship between temperature difference in heat flow is - ANSWER The
greater the temperature difference the more rapid the heat flows
Specific heat - ANSWER Is greater as a substance requires more heat energy to
increase temperature
Temperature is a measure of - ANSWER The intensity of heat energy in an object
Which of the answers below is an example of heat transferred by conduction -
ANSWER A rod heated on one end and becoming warm at the other end.
Which are the two most common forms of heat transfer in refrigeration - ANSWER
Conduction and convection
The condition of a boiling liquid is - ANSWER Saturated
A vapor cannot be - ANSWER Subcooled
What kind of measure is a ton of refrigeration - ANSWER A rate of heat
transferred in BTUs per unit of time
The condition of a liquid that exist at a temperature below its boiling point is -
ANSWER Sub cooled
Which does the refrigerant in the condenser change State from vapor to a liquid -
ANSWER The refrigerant loses heat energy to the sub rounding environment
The expansion valve controls only one of its items below which is it - ANSWER
The flow of liquid into the evaporator
Flash gas is - ANSWER Only the gas created at the expansion device
Which is a example of pressure drop - ANSWER The loss of pressure as a fluid
moves down the pipe due to the interaction of the fluid in the inner walls of the
pipe
Refrigerant absorbs the most heat when - ANSWER Changing from a liquid to a
vapor
The latent heat of condensation of a substance is exactly the same quality as -
ANSWER The latent heat of evaporation of the substance
Saturated conditions exist - ANSWER At some point within an evaporator and
condenser
Flash gas - ANSWER Is formed after the point of expansion
, The four necessary components of a mechanical refrigeration system are -
ANSWER Expansion device, evaporator, compressor, condenser
A conventional mechanical refrigeration system is considered - ANSWER A
closed loop system
Super heat is found at which point of a typical system - ANSWER The compressor
suction and compressor discharge line
In an operating ammonia refrigeration system, subcooled refrigerant can only be
a - ANSWER Liquid
Superheated refrigerant can only be a - ANSWER Vapor
Saturated refrigerant can - ANSWER Be a liquid, vapor or a combination of the
two
What is needed to get a fluid to flow - ANSWER A pressure difference
What is one advantage to having evaporator pressures higher than atmospheric
pressure - ANSWER Higher pressures keep air out of the system
R 507 is a/an - ANSWER Azeotrope
what do you multiply times the mass flow rate to determine the vapor flow rate
through the compressor - ANSWER Specific volume cubic feet/lb
Three factors to consider when choosing a refrigerant - ANSWER Cost,
availability, and safety
According to this text, trapped ammonia liquid results and how much pressure
change? - ANSWER 100 to 150 PSI per degree Fahrenheit increase
One positive characteristic of halocarbon refrigerants is - ANSWER They are
usually not explosive
A slight leak in a fitting on a HCFC/22 system causes the Halide torch flame to -
ANSWER Turn green
If the reciprocating Systems evaporator temperature is decreased, what happens
to the compressor theoretical discharge temperature? - ANSWER Discharge
temperature rises
Which refrigerant requires the largest compressor displacement per ton? -
ANSWER R-134a
