Evaporator - ANSWER The air conditioning component located in the cab
85 degrees Fahrenheit - ANSWER A container of R-134a has a pressure of 95psig. What is the temperature?
R-134a - ANSWER The common refrigerant u
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Evaporator - ANSWER The air conditioning component located in the cab
85 degrees Fahrenheit - ANSWER A container of R-134a has a pressure of 95psig. What is the temperature?
R-134a - ANSWER The common refrigerant used in current trucks
Conditions underhood ram air - ANSWER The following is NOT a function of a truck air-conditioning system
behavior of heat - ANSWER Best describes the branch of physics known as thermodynamics
Both A and B - ANSWER Tech A says that all matter on earth contains some heat energy. Tech B says that a substance with no heat energy would have a temperature of minus 459 Fahrenheit or absolute zero.
Btu - ANSWER The amount of heat energy required to raise 1lb of water by 1 degree Fahrenheit is known as
When a substance is frozen to a solid state, heat energy is released. - ANSWER When ice melts heat energy is absorbed
light blue - ANSWER The color of R-134a refrigerant container
Recover all refrigerant from the A/C station - ANSWER What must be done with an A/C system before replacing any system components
When a liquid boils, heat is absorbed - ANSWER
latent heat of vaporization - ANSWER heat energy required to change a liquid to a vapor without raising its temperature
BTU - ANSWER the standard measurement of heat energy to rate A/C specifications
Joules - ANSWER the metric measurement of heat enery
condensation stage - ANSWER the stage in which typical refrigeration cycle changes from a high-pressure gas to a high pressure liquid
evaporation stage - ANSWER the stage in which typical refrigeration cycle changes from a low pressure liquid to a low pressure gas
evaporator - ANSWER the air conditioning component that is located in the cab
binary switch and trinary switch - ANSWER the components that protect an A/C circuit from under pressure or over pressure
whenever a compressor needs to be isolated - ANSWER a stem type valve should be front seated
R-134a - ANSWER refrigerant commonly used in current trucks
conditions underhood ram air - ANSWER This is NOT a function of a truck air conditioning system
condenser - ANSWER a component that is a heat exchanger
Both A and B - ANSWER Tech A says all matter on earth contains some heat energy. Tech B says that a substance with no heat energy would have a temperature of minus 459 Fahrenheit or absolute zero.
three - ANSWER How many state of matter are identifiable under normal atmospheric conditions
R-22 - ANSWER Most common refrigerant used in current reefer trailers
evaporator - ANSWER the coldest point in a properly function A/C circuit
Compressor stage - ANSWER change a low pressure gas to a high pressure gas
condenser stage - ANSWER changes from a high pressure gas to a high pressure liquid
condenser - ANSWER heat exchanger, effected by the ram air effect
ram air effect - ANSWER the airflow created by vehicle movement
expansion valve stage - ANSWER changes from a high pressure liquid to a low pressure liquid
expansion valve - ANSWER the dividing point from high/low pressure
evaporator stage - ANSWER changes from a low pressure liquid to a low pressure gas
evaporator - ANSWER located in the cab, removes heat from the cab
latent heat of vaporation - ANSWER when a substance changes from a liquid to a gas, heat is absorbed. This is how the evaporator removes heat from the cab.
1 btu - ANSWER the amount of heat required to raise the temperature of 1lb of water by 1 degree F
a liquid changes to a gas and back to a liquid - ANSWER what is a function of a refrigeration system
the condenser - ANSWER the component in an air conditioning system that is responsible fro removing heat from the circulating refrigerant
TXV - ANSWER the component that regulates refrigerant flow to the evaporator
high pressure line and low pressure line - ANSWER the two main refrigerant lines are known as
tech A only - ANSWER tech A wears safety goggles and rubber gloves when discharging the a/c system. tech b wears safety goggles and leather gloves when charging and leak testing the system
both A and B - ANSWER when checking an A/C sight glass for moisture content of the refrigerant.
Tech A performs the check with the air conditioner running immediately after starting the engine. Tech b says that some observable bubbles in the sight glass at system startup are
cleaning the outer surface of the condenser with modulated compressed air and soap, repairing leaks in the evaporator coil and improving the performance of the engine cooling system - ANSWER the following procedures may improve HVAC system performance
recharging cylinder - ANSWER piece of equipment used to meter out a desired amount of specific refrigerant by weight
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