EPA 608 Universal Exam ( ACTUAL EXAM )
Questions With 100% Verified Solutions|
Which safety precaution(s) should always be followed: - Never apply an
open flame to a refrigerant cylinder; never cut or weld any refrigerant line
when refrigerant is in the line; never use oxygen to purge lines or to
pressurize a system. - ANSWER
In a vapor compression refrigeration system, cooling occurs
when: - refrigerant liquid turns to a vapor. - ANSWER
The evacuation of a system is a method of: - dehydration. -
ANSWER
Each chlorine atom in the stratosphere can destroy____ozone
molecules. - 100,000 - ANSWER
An example of a HFC refrigerant is: - R-410A - ANSWER
Which gas(es) would cause the LEAST damage to the
environment during a leak check? - dry nitrogen - ANSWER
Refrigerant migrates to the compressor crankcase because of a difference
in______between the refrigerant and the oil. - vapor pressure. - ANSWER
Which refrigerant is an HCFC? - R-22, R-123, R-124 - ANSWER
It is important not to mix R-22 and R-410A refrigerants in the same
container because: - the mixture may be impossible to reclaim. -
ANSWER
When using recover unit, the fill level of the recovery tank can be
controlled by: - a mechanical switch; an electronic shut-off device;
weight - ANSWER
, Which of the following refrigerant releases is a violation of the EPA
prohibition on venting? - release of mixtures of nitrogen and refrigerant that
result from adding nitrogen to a fully charged appliance to "leak-check" the
appliance. - ANSWER
Which of the following human health effects could result from an increase
in ultraviolet radiation? - an increase in cataracts cases -
ANSWER
Never use an open flame to heat a refrigerant tank because: - i t
can result in venting refrigerant to the atmosphere; the tank may
explode, causing serious injury to people nearby; refrigerant in the
tank may decompose, forming a toxic material. - ANSWER
When transporting cylinders containing used refrigerant, the DOT
requires that you: - attach DOT classification tags - ANSWER
According to ASHRAE's 1992 refrigerant safety classification which of the
following designations would be the most safe? - A-1
- ANSWER
The over-evacuation of a system: - does not occur. - ANSWER
Equipment covered by EPA regulations include: - all airconditioning and
refrigeration equipment using CFC, HCFC or
HFC refrigerants. - ANSWER
Never overfill refrigerant storage cylinders because: - the internal pressure
of the cylinders may rise in heated areas and cause an explosion. -
ANSWER
It is important not to mix different refrigerants in the same container
because: - the mixture may be impossible to reclaim. -
ANSWER
Manifold gauge sets are often color coded, when this is done, the
low pressure gauge is color coded: - blue. - ANSWER
, All devices used for a refrigerant recovery must: - Meet EPA
standards - ANSWER
Reusable refrigerant containers that are normally under any pressure
above 15 pig must be hydrostatically tested and date stamped every: - 5
Years - ANSWER
Which refrigerant(s) must be recovered before opening a system or
disposing of a system? - all refrigerants must be recovered. -
ANSWER
To obtain an accurate vacuum readings during system evacuation, the
system vacuum gauge should be located: - as far
from the vacuum pump as possible. - ANSWER
What is the best proof that CFCs are in the stratosphere? - measurements
of CFCs in air samples from the stratosphere -
ANSWER
The recovery of refrigerants is necessary to: - maintain adequate
supplies for service calls after the production bans; prevent the
venting of refrigerants to the atmosphere; prevent stratospheric
ozone depletion - ANSWER
An example of an HFC refrigerant is: - R-410A - ANSWER
A compound pressure gauge, typically used on the low side of the system,
measures pressure in: - psig and inches of mercury -
ANSWER
______________refers to the process of cleaning refrigerant by oil
separation and single or multiple passes through filter-driers, which reduce
moisture and acidity? - Recycling - ANSWER
The high pressure gauge on service manifold sets has a continuous scale,
usually calibrated to read from: - 0 to 500 psi -
ANSWER
Questions With 100% Verified Solutions|
Which safety precaution(s) should always be followed: - Never apply an
open flame to a refrigerant cylinder; never cut or weld any refrigerant line
when refrigerant is in the line; never use oxygen to purge lines or to
pressurize a system. - ANSWER
In a vapor compression refrigeration system, cooling occurs
when: - refrigerant liquid turns to a vapor. - ANSWER
The evacuation of a system is a method of: - dehydration. -
ANSWER
Each chlorine atom in the stratosphere can destroy____ozone
molecules. - 100,000 - ANSWER
An example of a HFC refrigerant is: - R-410A - ANSWER
Which gas(es) would cause the LEAST damage to the
environment during a leak check? - dry nitrogen - ANSWER
Refrigerant migrates to the compressor crankcase because of a difference
in______between the refrigerant and the oil. - vapor pressure. - ANSWER
Which refrigerant is an HCFC? - R-22, R-123, R-124 - ANSWER
It is important not to mix R-22 and R-410A refrigerants in the same
container because: - the mixture may be impossible to reclaim. -
ANSWER
When using recover unit, the fill level of the recovery tank can be
controlled by: - a mechanical switch; an electronic shut-off device;
weight - ANSWER
, Which of the following refrigerant releases is a violation of the EPA
prohibition on venting? - release of mixtures of nitrogen and refrigerant that
result from adding nitrogen to a fully charged appliance to "leak-check" the
appliance. - ANSWER
Which of the following human health effects could result from an increase
in ultraviolet radiation? - an increase in cataracts cases -
ANSWER
Never use an open flame to heat a refrigerant tank because: - i t
can result in venting refrigerant to the atmosphere; the tank may
explode, causing serious injury to people nearby; refrigerant in the
tank may decompose, forming a toxic material. - ANSWER
When transporting cylinders containing used refrigerant, the DOT
requires that you: - attach DOT classification tags - ANSWER
According to ASHRAE's 1992 refrigerant safety classification which of the
following designations would be the most safe? - A-1
- ANSWER
The over-evacuation of a system: - does not occur. - ANSWER
Equipment covered by EPA regulations include: - all airconditioning and
refrigeration equipment using CFC, HCFC or
HFC refrigerants. - ANSWER
Never overfill refrigerant storage cylinders because: - the internal pressure
of the cylinders may rise in heated areas and cause an explosion. -
ANSWER
It is important not to mix different refrigerants in the same container
because: - the mixture may be impossible to reclaim. -
ANSWER
Manifold gauge sets are often color coded, when this is done, the
low pressure gauge is color coded: - blue. - ANSWER
, All devices used for a refrigerant recovery must: - Meet EPA
standards - ANSWER
Reusable refrigerant containers that are normally under any pressure
above 15 pig must be hydrostatically tested and date stamped every: - 5
Years - ANSWER
Which refrigerant(s) must be recovered before opening a system or
disposing of a system? - all refrigerants must be recovered. -
ANSWER
To obtain an accurate vacuum readings during system evacuation, the
system vacuum gauge should be located: - as far
from the vacuum pump as possible. - ANSWER
What is the best proof that CFCs are in the stratosphere? - measurements
of CFCs in air samples from the stratosphere -
ANSWER
The recovery of refrigerants is necessary to: - maintain adequate
supplies for service calls after the production bans; prevent the
venting of refrigerants to the atmosphere; prevent stratospheric
ozone depletion - ANSWER
An example of an HFC refrigerant is: - R-410A - ANSWER
A compound pressure gauge, typically used on the low side of the system,
measures pressure in: - psig and inches of mercury -
ANSWER
______________refers to the process of cleaning refrigerant by oil
separation and single or multiple passes through filter-driers, which reduce
moisture and acidity? - Recycling - ANSWER
The high pressure gauge on service manifold sets has a continuous scale,
usually calibrated to read from: - 0 to 500 psi -
ANSWER
