Ammonia Refrigeration Final Exam GUARANTEED
PASS!!
Convection is the transfer of ____ - (ANSWER)heat through a material or substance
Radiation is the ____ - (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 -
(ANSWER)false
What are two methods of heat transfer? - (ANSWER)conduction and convection
What are two basic forms of refrigeration systems? - (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 - (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 - (ANSWER)true
T or F: Compression occurs as the ammonia refrigerant passes through the evaporator - (ANSWER)false
T or F: The high side includes all components between the pressure reduction device outlet to a point
inside the compressor - (ANSWER)false
Heat contained in the area to be cooled and absorbed by the ammonia refrigerant as it passes through
the evaporator is called? - (ANSWER)the load
The low side of an ammonia refrigeration system consists of ... - (ANSWER)the pressure reduction device
and the condenser
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, T or F: Expansion occurs as the refrigerant flows through the compressor - (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 - (ANSWER)false
T or F: Evaporation takes place as the ammonia refrigerant flows through the compressor -
(ANSWER)false
T or F: The evaporation process is completed when the ammonia has passed through the evaporator -
(ANSWER)true
Absolute pressure is the pressure read by a gauge, plus the ____ atmospheric pressure -
(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 - (ANSWER)true
Where is the worst place to have a leak in an ammonia refrigeration system? - (ANSWER)high pressure
liquid
How many BTUs does it take to convert 1 lb of saturated ammonia to 1 lb of saturated gas? -
(ANSWER)561
How many BTUs does it take to convert 1 lb of liquid water at 212° to steam as 212°F - (ANSWER)970
How many BTUs does it take to melt 1 lb of ice into water at 32°F - (ANSWER)144
What is specific heat ? - (ANSWER)the amount of heat transferred to change 1 lb of a substance 1°F
What is the IDLH for ammonia? - (ANSWER)300 PPM
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PASS!!
Convection is the transfer of ____ - (ANSWER)heat through a material or substance
Radiation is the ____ - (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 -
(ANSWER)false
What are two methods of heat transfer? - (ANSWER)conduction and convection
What are two basic forms of refrigeration systems? - (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 - (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 - (ANSWER)true
T or F: Compression occurs as the ammonia refrigerant passes through the evaporator - (ANSWER)false
T or F: The high side includes all components between the pressure reduction device outlet to a point
inside the compressor - (ANSWER)false
Heat contained in the area to be cooled and absorbed by the ammonia refrigerant as it passes through
the evaporator is called? - (ANSWER)the load
The low side of an ammonia refrigeration system consists of ... - (ANSWER)the pressure reduction device
and the condenser
Page 1 of 15
, T or F: Expansion occurs as the refrigerant flows through the compressor - (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 - (ANSWER)false
T or F: Evaporation takes place as the ammonia refrigerant flows through the compressor -
(ANSWER)false
T or F: The evaporation process is completed when the ammonia has passed through the evaporator -
(ANSWER)true
Absolute pressure is the pressure read by a gauge, plus the ____ atmospheric pressure -
(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 - (ANSWER)true
Where is the worst place to have a leak in an ammonia refrigeration system? - (ANSWER)high pressure
liquid
How many BTUs does it take to convert 1 lb of saturated ammonia to 1 lb of saturated gas? -
(ANSWER)561
How many BTUs does it take to convert 1 lb of liquid water at 212° to steam as 212°F - (ANSWER)970
How many BTUs does it take to melt 1 lb of ice into water at 32°F - (ANSWER)144
What is specific heat ? - (ANSWER)the amount of heat transferred to change 1 lb of a substance 1°F
What is the IDLH for ammonia? - (ANSWER)300 PPM
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