AMMONIA REFRIGERATION FINAL
EXAM QUESTIONS & ANSWERS
100% CORRECT
Convection is the transfer of ____ - ANSWERheat through a material or substance
Radiation is the ____ - ANSWERprojection of heat like the heat radiated by the sun
or by an open flame
T or F: Heat is always on the move, traveling only in one direction and always from
hot to cold - ANSWERfalse
The general direction of heat flow in a refrigeration system is heat energy loss in the
discharge line and condenser, heat energy ____ in the evaporator and compressor -
ANSWERgain
Before the formation of liquid occurs in the condenser, the condenser's refrigerant
vapor must be ____ - ANSWERdesuperheated
In shell and tube condensers, water circulates in the tubes and refrigerant vapor in
the ____ - ANSWERshell
Evaporative condensers derive their heat rejection capability from the evaporation of
____ - ANSWERwater
An induced draft fan draws air through the ____ - ANSWERcoils
In condensers with multiple fans, control of head pressure is achieved by ____ fans
or varying fan speed - ANSWERcycling
The main purpose of a refrigeration system is to ____ - ANSWERmaintain a
temperature
Mechanical refrigeration is a series of steps that moves heat energy from the space
or object to an area where it can do no ____ - ANSWERharm
Heat energy always flows from an object at ____ - ANSWERhigher temperature to
an object at a lower temperature
Sensible heat is heat energy that causes a change in temperature but does not
causes a change of ____ - ANSWERstate
, Latent heat is heat energy that causes a change of state but does not cause a
change in ____ - ANSWERtemperature
____'s are used to measure the quality of heat energy - ANSWERBTU
Mass, latent heat, temperature, and specific heat are used in ____ calculations -
ANSWERheat
What are two methods of heat transfer? - ANSWERconduction and convection
What are two basic forms of refrigeration systems? - ANSWERdirect expansion and
gravity flooded
T or F: Conduction is the heat transferred due to the temperature being different on
one side of a room than the other like the heat rising in a room - ANSWERtrue
T or F: A basic refrigeration system consists of an expansion device, an evaporator,
a compressor, and a condenser connected by a series of pipes - ANSWERtrue
T or F: Compression occurs as the ammonia refrigerant passes through the
evaporator - ANSWERfalse
T or F: The high side includes all components between the pressure reduction
device outlet to a point inside the compressor - ANSWERfalse
Heat contained in the area to be cooled and absorbed by the ammonia refrigerant as
it passes through the evaporator is called? - ANSWERthe load
The low side of an ammonia refrigeration system consists of ... - ANSWERthe
pressure reduction device and the condenser
T or F: Expansion occurs as the refrigerant flows through the compressor -
ANSWERfalse
T or F: When a hand expansion valve is opened, pressure behind the valve forces
liquid ammonia through a small opening causing a deliberate pressure drop to occur
- ANSWERfalse
T or F: Evaporation takes place as the ammonia refrigerant flows through the
compressor - ANSWERfalse
T or F: The evaporation process is completed when the ammonia has passed
through the evaporator - ANSWERtrue
Absolute pressure is the pressure read by a gauge, plus the ____ atmospheric
pressure - ANSWERambient
T or F: A pumped liquid, or re-circulation single stage system consists of a receiver,
a king valve, a pressure reduction device, an evaporator, a compressor, a
condenser, a vessel, a pump and an additional flow metering device - ANSWERtrue
EXAM QUESTIONS & ANSWERS
100% CORRECT
Convection is the transfer of ____ - ANSWERheat through a material or substance
Radiation is the ____ - ANSWERprojection of heat like the heat radiated by the sun
or by an open flame
T or F: Heat is always on the move, traveling only in one direction and always from
hot to cold - ANSWERfalse
The general direction of heat flow in a refrigeration system is heat energy loss in the
discharge line and condenser, heat energy ____ in the evaporator and compressor -
ANSWERgain
Before the formation of liquid occurs in the condenser, the condenser's refrigerant
vapor must be ____ - ANSWERdesuperheated
In shell and tube condensers, water circulates in the tubes and refrigerant vapor in
the ____ - ANSWERshell
Evaporative condensers derive their heat rejection capability from the evaporation of
____ - ANSWERwater
An induced draft fan draws air through the ____ - ANSWERcoils
In condensers with multiple fans, control of head pressure is achieved by ____ fans
or varying fan speed - ANSWERcycling
The main purpose of a refrigeration system is to ____ - ANSWERmaintain a
temperature
Mechanical refrigeration is a series of steps that moves heat energy from the space
or object to an area where it can do no ____ - ANSWERharm
Heat energy always flows from an object at ____ - ANSWERhigher temperature to
an object at a lower temperature
Sensible heat is heat energy that causes a change in temperature but does not
causes a change of ____ - ANSWERstate
, Latent heat is heat energy that causes a change of state but does not cause a
change in ____ - ANSWERtemperature
____'s are used to measure the quality of heat energy - ANSWERBTU
Mass, latent heat, temperature, and specific heat are used in ____ calculations -
ANSWERheat
What are two methods of heat transfer? - ANSWERconduction and convection
What are two basic forms of refrigeration systems? - ANSWERdirect expansion and
gravity flooded
T or F: Conduction is the heat transferred due to the temperature being different on
one side of a room than the other like the heat rising in a room - ANSWERtrue
T or F: A basic refrigeration system consists of an expansion device, an evaporator,
a compressor, and a condenser connected by a series of pipes - ANSWERtrue
T or F: Compression occurs as the ammonia refrigerant passes through the
evaporator - ANSWERfalse
T or F: The high side includes all components between the pressure reduction
device outlet to a point inside the compressor - ANSWERfalse
Heat contained in the area to be cooled and absorbed by the ammonia refrigerant as
it passes through the evaporator is called? - ANSWERthe load
The low side of an ammonia refrigeration system consists of ... - ANSWERthe
pressure reduction device and the condenser
T or F: Expansion occurs as the refrigerant flows through the compressor -
ANSWERfalse
T or F: When a hand expansion valve is opened, pressure behind the valve forces
liquid ammonia through a small opening causing a deliberate pressure drop to occur
- ANSWERfalse
T or F: Evaporation takes place as the ammonia refrigerant flows through the
compressor - ANSWERfalse
T or F: The evaporation process is completed when the ammonia has passed
through the evaporator - ANSWERtrue
Absolute pressure is the pressure read by a gauge, plus the ____ atmospheric
pressure - ANSWERambient
T or F: A pumped liquid, or re-circulation single stage system consists of a receiver,
a king valve, a pressure reduction device, an evaporator, a compressor, a
condenser, a vessel, a pump and an additional flow metering device - ANSWERtrue
