Ammonia Refrigeration Final Exam
questions n answers rated A+
Convection is the transfer of ____ - correct answer ✔✔ heat through a material or substance
Radiation is the ____ - correct answer ✔✔ projection 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 -
correct answer ✔✔ false
What are two methods of heat transfer? - correct answer ✔✔ conduction and convection
What are two basic forms of refrigeration systems? - correct answer ✔✔ direct 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 - correct answer ✔✔ true
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 - correct answer ✔✔ true
T or F: Compression occurs as the ammonia refrigerant passes through the evaporator - correct
answer ✔✔ false
T or F: The high side includes all components between the pressure reduction device outlet to a
point inside the compressor - correct answer ✔✔ false
,Heat contained in the area to be cooled and absorbed by the ammonia refrigerant as it passes
through the evaporator is called? - correct answer ✔✔ the load
The low side of an ammonia refrigeration system consists of ... - correct answer ✔✔ the
pressure reduction device and the condenser
T or F: Expansion occurs as the refrigerant flows through the compressor - correct answer ✔✔
false
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 - correct answer
✔✔ false
T or F: Evaporation takes place as the ammonia refrigerant flows through the compressor -
correct answer ✔✔ false
T or F: The evaporation process is completed when the ammonia has passed through the
evaporator - correct answer ✔✔ true
Absolute pressure is the pressure read by a gauge, plus the ____ atmospheric pressure - correct
answer ✔✔ ambient
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 - correct answer ✔✔ true
Where is the worst place to have a leak in an ammonia refrigeration system? - correct answer
✔✔ high pressure liquid
, How many BTUs does it take to convert 1 lb of saturated ammonia to 1 lb of saturated gas? -
correct answer ✔✔ 561
How many BTUs does it take to convert 1 lb of liquid water at 212° to steam as 212°F - correct
answer ✔✔ 970
How many BTUs does it take to melt 1 lb of ice into water at 32°F - correct answer ✔✔ 144
What is specific heat ? - correct answer ✔✔ the amount of heat transferred to change 1 lb of a
substance 1°F
What is the IDLH for ammonia? - correct answer ✔✔ 300 PPM
Under what conditions may some synthetic refrigerants become toxic? - correct answer ✔✔
contact with an open flame
100°C equals - correct answer ✔✔ 212°F
Copper tubing is never used with? - correct answer ✔✔ R717
A "King" valve is a ____ - correct answer ✔✔ receiver inlet valve
The centrifugal compressor is ____ a positive displacement compressor - correct answer ✔✔
not
Heat is rejected in the ____ - correct answer ✔✔ condenser
What type of fan pushes air through coil? - correct answer ✔✔ forced draft
questions n answers rated A+
Convection is the transfer of ____ - correct answer ✔✔ heat through a material or substance
Radiation is the ____ - correct answer ✔✔ projection 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 -
correct answer ✔✔ false
What are two methods of heat transfer? - correct answer ✔✔ conduction and convection
What are two basic forms of refrigeration systems? - correct answer ✔✔ direct 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 - correct answer ✔✔ true
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 - correct answer ✔✔ true
T or F: Compression occurs as the ammonia refrigerant passes through the evaporator - correct
answer ✔✔ false
T or F: The high side includes all components between the pressure reduction device outlet to a
point inside the compressor - correct answer ✔✔ false
,Heat contained in the area to be cooled and absorbed by the ammonia refrigerant as it passes
through the evaporator is called? - correct answer ✔✔ the load
The low side of an ammonia refrigeration system consists of ... - correct answer ✔✔ the
pressure reduction device and the condenser
T or F: Expansion occurs as the refrigerant flows through the compressor - correct answer ✔✔
false
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 - correct answer
✔✔ false
T or F: Evaporation takes place as the ammonia refrigerant flows through the compressor -
correct answer ✔✔ false
T or F: The evaporation process is completed when the ammonia has passed through the
evaporator - correct answer ✔✔ true
Absolute pressure is the pressure read by a gauge, plus the ____ atmospheric pressure - correct
answer ✔✔ ambient
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 - correct answer ✔✔ true
Where is the worst place to have a leak in an ammonia refrigeration system? - correct answer
✔✔ high pressure liquid
, How many BTUs does it take to convert 1 lb of saturated ammonia to 1 lb of saturated gas? -
correct answer ✔✔ 561
How many BTUs does it take to convert 1 lb of liquid water at 212° to steam as 212°F - correct
answer ✔✔ 970
How many BTUs does it take to melt 1 lb of ice into water at 32°F - correct answer ✔✔ 144
What is specific heat ? - correct answer ✔✔ the amount of heat transferred to change 1 lb of a
substance 1°F
What is the IDLH for ammonia? - correct answer ✔✔ 300 PPM
Under what conditions may some synthetic refrigerants become toxic? - correct answer ✔✔
contact with an open flame
100°C equals - correct answer ✔✔ 212°F
Copper tubing is never used with? - correct answer ✔✔ R717
A "King" valve is a ____ - correct answer ✔✔ receiver inlet valve
The centrifugal compressor is ____ a positive displacement compressor - correct answer ✔✔
not
Heat is rejected in the ____ - correct answer ✔✔ condenser
What type of fan pushes air through coil? - correct answer ✔✔ forced draft
