EPA Section 608 Exam With Complete Solutions
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-EPA Section 608
-EPA Section 608 Core
EPA Section 608
What is the normal use of the center port of gauge set? - ANSWER It is used in the
procedure for evacuation, charging and recovery.
What colour are the gauges on a manifold gauge set? - ANSWER The low pressure are
coloured blue and High pressure - red.
What are the common ranges of pressure measurements that might be used on the
gauges of a manifold gauge set? - ANSWER High side is 0 to 500 PSIG; Low side is 0 to
350 PSIG and 0 to 30 in. Hg below atmospheric pressure.
Is the refrigerant leaving a condenser at high or low pressure? Is it a liquid or a gas? -
ANSWER High pressure, liquid.
Is the refrigerant entering the expansion valve (variable metering device) a liquid or
gas? - ANSWER Liquid, high pressure.
Is the pressure of the refrigerant entering the compressor high or low? - ANSWER Low
pressure vapor.
Where in a refrigerant circuit does a liquid boil to absorb heat? - ANSWER In the
evaporator.
,The refrigerant in the suction line is a gas that has been heated above its saturation.
What is this condition called? - ANSWER Superheated vapor.
What can cause liquid refrigerant to migrate to a compressor crankcase? - ANSWER If
the compressor is located in the coldest location in the circuit.
Name two conditions that can quickly destroy a compressor that is just starting to run? -
ANSWER Running under a deep vacuum or when the service valves are closed.
Which system failures require an oil sample be taken? - ANSWER A burnout of the
compressor or if the unit has had a leak.
Is refrigerant flushing a satisfactory method for cleaning a tube? - ANSWER No.
In addition to preventing and repairing leaks, what activity should a technician do to
help conserve refrigerant? - ANSWER Recover and recycle used refrigerants.
Upon what factors does the speed of evacuation depend? - ANSWER Pump size, hose
length, hose diameter, size of system to be evacuated, ambient temperature, suction
line size, and the amount of moisture in the system.
What should be the sizing of gauge set hoses when used to evacuate a system? -
ANSWER Shortest length, largest diameter; for faster evacuations At least the size of
the inlet on the vacuum pump
What is an advantage of using short hoses with large diameters while evacuating? -
ANSWER Lowers emissions, pressure drop and lengthens evacuation time.
which fitting dictates the size of the hoses that should be utilized with a vacuum pump? -
ANSWER The inlet to the vacuum pump.
,As capacity and suction hose size are increased, what happens to time needed for an
evacuation? - ANSWER Time is reduced.
Why is a system heated while dehydrating? - ANSWER To speed up the removal of
moisture.
Does a thorough evacuation remove moisture from a system? - ANSWER Yes.
What can happen to oil in the compressor if the moisture is left in an operating system? -
ANSWER The oil will form hydrofluoric and hydrochloric acids which will corrode the
internal parts of the system.
What is the result of over-evacuating a system? - ANSWER No damage will be done.
How is leak checking done in a system using a low pressure gauge? - ANSWER The
vacuum reading will rise if the vacuum pump is turned off.
At what distance must the vacuum gauge be from the vacuum pump during evacuation?
- ANSWER It should be kept as far away as possible.
When measuring the vacuum of a system being evacuated the system must be isolated.
What must be done to the vacuum pump? - ANSWER Turn it off and valve it off.
What is ozone? - ANSWER 3 atoms of oxygen. It blocks much of the harmful ultraviolet
radiation (uv-b) emitted from the sun and it keeps our earth's temperature stable.
How much ozone can a chlorine atom destroy in the stratosphere? - ANSWER One
atom can destroy 100,000 ozone molecules.
What is Ozone Depletion Potential (ODP)? - ANSWER The ability of any chemical to
deplete the ozone layer.
, What is CFC? - ANSWER Chlorofluorocarbon.
Which refrigerants are CFC's? - ANSWER R-11,12,113,114.
Which chemical in the CFC refrigerants does the most damage to the ozone layer? -
ANSWER Chlorine.
What is an HCFC? - ANSWER Hydrochlorofluorocarbons.
Which refrigerants are HCFC's? - ANSWER R-22,123.
Which is more harmful to the ozone layer, a CFC or an HCFC? - ANSWER CFC's.
What is it about CFC's that make them more harmful to the stratosphere? - ANSWER
Chemical strength, they will not breakdown in the lower atmosphere.
What is an HFC? - ANSWER A fluorocarbon that contains no chlorine.
Which refrigerants are HFC's? - ANSWER R-134a,404a,407c,410a.
What is the ODP of the HFC refrigerant? - ANSWER Zero.
Which refrigerants contain chlorine? - ANSWER CFC's and HCFC's.
Which refrigerants have high ODP? - ANSWER CFC's.
Which refrigerants have low ODP? - ANSWER HCFC's, HFC's are zero.
100% Verified New!!
-EPA Section 608
-EPA Section 608 Core
EPA Section 608
What is the normal use of the center port of gauge set? - ANSWER It is used in the
procedure for evacuation, charging and recovery.
What colour are the gauges on a manifold gauge set? - ANSWER The low pressure are
coloured blue and High pressure - red.
What are the common ranges of pressure measurements that might be used on the
gauges of a manifold gauge set? - ANSWER High side is 0 to 500 PSIG; Low side is 0 to
350 PSIG and 0 to 30 in. Hg below atmospheric pressure.
Is the refrigerant leaving a condenser at high or low pressure? Is it a liquid or a gas? -
ANSWER High pressure, liquid.
Is the refrigerant entering the expansion valve (variable metering device) a liquid or
gas? - ANSWER Liquid, high pressure.
Is the pressure of the refrigerant entering the compressor high or low? - ANSWER Low
pressure vapor.
Where in a refrigerant circuit does a liquid boil to absorb heat? - ANSWER In the
evaporator.
,The refrigerant in the suction line is a gas that has been heated above its saturation.
What is this condition called? - ANSWER Superheated vapor.
What can cause liquid refrigerant to migrate to a compressor crankcase? - ANSWER If
the compressor is located in the coldest location in the circuit.
Name two conditions that can quickly destroy a compressor that is just starting to run? -
ANSWER Running under a deep vacuum or when the service valves are closed.
Which system failures require an oil sample be taken? - ANSWER A burnout of the
compressor or if the unit has had a leak.
Is refrigerant flushing a satisfactory method for cleaning a tube? - ANSWER No.
In addition to preventing and repairing leaks, what activity should a technician do to
help conserve refrigerant? - ANSWER Recover and recycle used refrigerants.
Upon what factors does the speed of evacuation depend? - ANSWER Pump size, hose
length, hose diameter, size of system to be evacuated, ambient temperature, suction
line size, and the amount of moisture in the system.
What should be the sizing of gauge set hoses when used to evacuate a system? -
ANSWER Shortest length, largest diameter; for faster evacuations At least the size of
the inlet on the vacuum pump
What is an advantage of using short hoses with large diameters while evacuating? -
ANSWER Lowers emissions, pressure drop and lengthens evacuation time.
which fitting dictates the size of the hoses that should be utilized with a vacuum pump? -
ANSWER The inlet to the vacuum pump.
,As capacity and suction hose size are increased, what happens to time needed for an
evacuation? - ANSWER Time is reduced.
Why is a system heated while dehydrating? - ANSWER To speed up the removal of
moisture.
Does a thorough evacuation remove moisture from a system? - ANSWER Yes.
What can happen to oil in the compressor if the moisture is left in an operating system? -
ANSWER The oil will form hydrofluoric and hydrochloric acids which will corrode the
internal parts of the system.
What is the result of over-evacuating a system? - ANSWER No damage will be done.
How is leak checking done in a system using a low pressure gauge? - ANSWER The
vacuum reading will rise if the vacuum pump is turned off.
At what distance must the vacuum gauge be from the vacuum pump during evacuation?
- ANSWER It should be kept as far away as possible.
When measuring the vacuum of a system being evacuated the system must be isolated.
What must be done to the vacuum pump? - ANSWER Turn it off and valve it off.
What is ozone? - ANSWER 3 atoms of oxygen. It blocks much of the harmful ultraviolet
radiation (uv-b) emitted from the sun and it keeps our earth's temperature stable.
How much ozone can a chlorine atom destroy in the stratosphere? - ANSWER One
atom can destroy 100,000 ozone molecules.
What is Ozone Depletion Potential (ODP)? - ANSWER The ability of any chemical to
deplete the ozone layer.
, What is CFC? - ANSWER Chlorofluorocarbon.
Which refrigerants are CFC's? - ANSWER R-11,12,113,114.
Which chemical in the CFC refrigerants does the most damage to the ozone layer? -
ANSWER Chlorine.
What is an HCFC? - ANSWER Hydrochlorofluorocarbons.
Which refrigerants are HCFC's? - ANSWER R-22,123.
Which is more harmful to the ozone layer, a CFC or an HCFC? - ANSWER CFC's.
What is it about CFC's that make them more harmful to the stratosphere? - ANSWER
Chemical strength, they will not breakdown in the lower atmosphere.
What is an HFC? - ANSWER A fluorocarbon that contains no chlorine.
Which refrigerants are HFC's? - ANSWER R-134a,404a,407c,410a.
What is the ODP of the HFC refrigerant? - ANSWER Zero.
Which refrigerants contain chlorine? - ANSWER CFC's and HCFC's.
Which refrigerants have high ODP? - ANSWER CFC's.
Which refrigerants have low ODP? - ANSWER HCFC's, HFC's are zero.
