Ammonia Refrigeration Final Exam With
Complete Solutions
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
How much current flow across the heart is necessary for it to be a fatal shock? - correct
answer.💖💖💖💖✔<<<<<0.1 ampere
Complete Solutions
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
How much current flow across the heart is necessary for it to be a fatal shock? - correct
answer.💖💖💖💖✔<<<<<0.1 ampere
