Section 608 Certification
Pre-Test
Mr. Morgan
HVAC/R Instructor
CORE
Ozone in the stratosphere
above the earth consists of;
A: molecules containing 3 oxygen atoms.
B: molecules of 2 oxygen atoms.
C: radioactive particles.
D: pollutants that have risen from ground
level.
Which compounds have the
highest ozone depletion
potential (ODP)?
A:
B:
C:
D:
HCFCs.
HFCs.
CFCs.
All are equal.
Which atom of the CFC
molecule causes ozone
depletion?
A:
B:
C:
D:
Fluorine.
Chlorine.
Carbon.
Hydrogen.
What characteristic(s) of CFCs make them
more likely to reach the stratosphere than
most other compounds containing chlorine?
A: CFCs neither dissolve in water nor break
down into compounds that dissolve in
water, so they do not rain out of the
atmosphere.
B: CFCs are lighter than other chlorine
compounds, making it easier for them to
float upward when released.
C: CFCs are stored under pressure, causing
them to jet upward when released.
D: CFCs are attracted to ultraviolet radiation.
Each chlorine atom in the
stratosphere can destroy ______
ozone molecules.
A: 1
B: 3
C: 100,000
D: Chlorine is not the element in
refrigerant that harms ozone.
HCFC refrigerants are;
A: more harmful to stratospheric ozone
than CFCs.
B: as harmful to stratospheric ozone as
CFCs.
C: less harmful to stratospheric ozone
than CFCs.
D: not harmful to stratospheric ozone.
What effects can ozone
depletion have on the
environment?
A:
B:
C:
D:
Reduced crop yields.
Reduced marine life.
Increased ground-level ozone.
All of the above.
The Clean Air Act;
A: calls for the phase out of CFC/HCFC
production.
B: prohibits venting of CFC and HCFC
refrigerants and their substitutes.
C: requires EPA to set standards for
recovery of refrigerants prior to
appliance disposal.
D: All of the above.
An award of up to what amount may be paid
to a person supplying information that leads
to a penalty against a technician who is
intentionally venting?
A:
B:
C:
D:
$5,000.
$10,000.
$25,000.
$50,000.
Before you dispose of any appliance
containing a CFC or HCFC refrigerant,
you must;
A: recover the refrigerant.
B: purge the appliance with nitrogen.
C: flush the appliance with R-11.
D: seal the appliance so no refrigerant
can escape
Service technicians who violate
Clean Air Act provisions:
A: May be fined.
B: May lose certification.
C: May be required to appear in Federal
court.
D: All of the above.
Which of the following CFC or HCFC
refrigerant releases is considered a
violation of the prohibition on venting?
A: Release of "de minimis" quantities in the course of
making good faith attempts to recapture and
recycle or safely dispose of refrigerant.
B: Release of mixtures of nitrogen and refrigerant that
result from adding nitrogen to a fully charged
appliance to leak-check the appliance.
C: Refrigerants emitted in the course of normal
operation of an appliance.
D: Refrigerants emitted when connecting or
disconnecting hoses to charge or service an
appliance.
Some state and local
governments may establish
laws that;
A: follow the Clean Air Act/EPA
regulations.
B: are not as strict as the Clean Air
Act/EPA regulations.
C: contain stricter regulations than the
Clean Air Act / EPA regulations.
D: Both "A" and "C".
Chlorofluorocarbons (CFCs) and
hydrochlorofluorocarbons (HCFCs) have
which of the following in common?
A: They have the same ozone depletion
potential.
B: They both contain hydrogen.
C: They must be recovered before
opening or disposing of appliances.
D: They have the same saturation
pressure at 70°F.
The oils that will be employed
with most of the HFC-134a
refrigeration applications are;
A:
B:
C:
D:
esters.
alkylbenzenes.
whale oils.
All oils are compatible with HFC-134a.
Which of the following is an
approved "drop-in" service
replacement for R-12?
A:
B:
C:
D:
HFC-134a
HFC-125
CFC-502
None of the above
Refrigerant entering the
compressor of a refrigeration
system is a;
A:
B:
C:
D:
liquid
sub-cooled liquid
sub-cooled vapor
superheated vapor
Manufacturers often color code the exterior
of gauges. On a typical gauge manifold set,
the high pressure gauge is color coded;
A:
B:
C:
D:
green
yellow
blue
red
Removing refrigerant in any condition from a
system and storing it in an external container
without necessarily testing or processing it in
any way defines;
A:
B:
C:
D:
recycling.
recovering.
reclaiming.
restoring.
If a system will not hold a vacuum
after it has been evacuated, then;
A: the system is ready to be charged.
B: the system has been adequately
evacuated.
C: the system may be leaking.
D: an expansion valve is clogged.
Long hoses between the unit and
the recovery machine should be
avoided as they cause;
A: excessive pressure drop.
B: increased recovery time.
C: increased emissions.
D: All of the above.
The piping connection to the
vacuum pump should be;
A: as short in length and as large in
diameter as possible.
B: suitably sized to connect to a gauge
manifold.
C: coiled and taped together.
D: colored red or blue to meet codes.
Why shouldn't technicians use oxygen or
compressed air to pressurize appliances
to check for leaks?
A: When mixed with compressor oil or some
refrigerants, either oxygen or compressed
air can cause an explosion.
B: Leaking oxygen or compressed air is
difficult to detect.
C: The pressures produced by either oxygen
or compressed air are not acceptable.
D: Neither oxygen nor compressed air mix
well with refrigerants.
Under what conditions may
you use a disposable cylinder
to recover refrigerant?
A: When the system contains the same
refrigerant as the cylinder.
B: When the system contains less than
10 lbs. of refrigerant.
C: Only in an emergency.
D: Never.
How should refrigerant
cylinders be positioned when
they are shipped?
A:
B:
C:
D:
Inverted.
Upright.
Horizontally.
Stacked.
TYPE I
EPA regulations include which of
the following in the definition of a
"small appliance"?
A: Products manufactured, charged and
hermetically sealed in a factory.
B: Products having 5 pounds or less of
refrigerant.
C: Products with compressors under 1/2
horsepower.
D: Both "A" and "B".
Recovery equipment used during
maintenance, service or repair of small
appliances must be certified by an EPAapproved laboratory if manufactured AFTER:
A:
B:
C:
D:
July 1, 1992.
July 1, 1993.
May 13, 1993.
November 15, 1993.
The sale of CFC and HCFC
refrigerants is;
A: banned.
B: limited by law to equipment owners.
C: allowed only if there is proof of need.
D: restricted to technicians who are EPA
certified in refrigerant recovery.
When servicing a small
appliance for leak repair;
A: It is mandatory to repair the leak
within 30 days.
B: It is mandatory to repair the leak only
when 35% of the charge escapes
within a 12 month period.
C: It is not mandatory to repair the leak
but do so whenever possible.
D: Both "A" and "B".
If EPA regulations change after
a technician becomes certified;
A: the technician certification is "grand
fathered" for one year to allow time for
re-certification.
B: it will be the technician's responsibility to
comply with any future changes in the law.
C: a new certification test must be taken to be
re-certified.
D: Both "A" and "C".
EPA appliance sealed system with a nonoperating compressor if technicians are using
rules require capture of 80% of the refrigerant
from a small;
A: a system-dependent (passive)
process.
B: a self-contained (active) process.
C: Either recovery process.
D: Neither recovery process.
Which of the following is NOT
a Type I appliance?
A: An MVAC-like system that holds three
pounds of R-12.
B: A water cooler that holds 13 ounces
of R-12.
C: A food freezer that holds 22 ounces
of R-22.
D: A dehumidifier with seven ounces of
R-500.
When checking for non-condensables inside a
recovery cylinder, why should the technician allow the
temperature of the cylinder to stabilize to room
temperature before taking a pressure reading?
A: To prevent safety valves from purging
refrigerant.
B: It is a quick method of determining
refrigerant level inside the tank.
C: Comparisons to a pressure-temperature
chart are only valid if both the pressure and
temperature of the refrigerant are stable
and known.
D: A temperature reading alone is enough to
determine refrigerant quality.
When recovering refrigerant into a nonpressurized container from a refrigerator
with an in operative compressor;
A: it is necessary to heat the compressor and
strike it with a rubber mallet.
B: it is only necessary to recover as much
refrigerant as will naturally flow out of the
system.
C: it is not necessary to recover since the
refrigerant is probably contaminated.
D: it is necessary to chase refrigerant from the
oil with pressurized dry nitrogen.
When installing any type of access
fitting onto a sealed system;
A: the fitting should be leak tested before
proceeding with recovery.
B: it is not necessary to leak test an access
fitting.
C: the fitting need not be leak tested until the
total repair is completed.
D: the system must be pressurized with dry
nitrogen before leak testing can be
attempted.
When R-500 is recovered
from an appliance, it;
A: can be mixed with either R-22 or R-12
during the recovery process, since R-500 is
actually a mixture of the two refrigerants.
B: can be mixed with R-12 but not R-22
during the recovery process.
C: need not be recovered since R-500 is not
one of the refrigerants covered by the Clean
Air Act.
D: must be recovered into its own recovery
vessel that is clearly marked to ensure that
mixing of refrigerants does not occur.
A standard vacuum pump designed
specifically for evacuation and
dehydration can;
A: be used alone as a self-contained (active)
recovery device.
B: never be used as a recovery device in
combination with a pressurized container.
C: be used alone as a substitute for any
recovery device.
D: be used alone as a system-dependent
(passive) recovery device.
Using the system-dependent (passive)
recovery process, which condition requires the
accessing both the high and low side of the
system for refrigerant recovery?
A: When there is a leak in the system.
B: When the compressor operates
normally.
C: When the compressor only runs at
half speed.
D: When the compressor does not run.
Which of the following refrigerants must be
recovered with equipment currently
regulated by the equipment certification
requirements of the EPA under Section 608?
A:
B:
C:
D:
Sulfur dioxide.
Methyl chloride.
Methyl formate.
R-12.
The system-dependent (passive)
recovery process for small
appliances;
A: never needs the use of a pump or
heat to recover refrigerant.
B: must use a pressure relief device
when recovering refrigerant.
C: captures refrigerant in a nonpressurized container.
D: can only be performed on a system
with an operating compressor.
Before beginning a refrigerant
recovery procedure it is ALWAYS
necessary to;
A: allow the appliance to stabilize at
room temperature.
B: know the type of refrigerant that is in
the system.
C: remove the appliance to an outdoor
location.
D: disconnect the appliance from its
power source.
If a reclamation facility receives a
tank of mixed refrigerant, they
may;
A: refuse to process the refrigerant and
return it at the owner's expense.
B: agree to destroy the refrigerant, but
typically a substantial fee is charged.
C: resell the refrigerant for reuse in its
current state.
D: Both "A" and "B".
It is generally recommended that
piercing-type valves be used on which of
the following tubing materials?
A:
B:
C:
D:
Copper.
Aluminum.
Steel.
Both "A" and "B".
When filling a graduated charging
cylinder, refrigerant that is vented
off the top of the cylinder;
A: need not be recovered.
B: must be recovered.
C: is considered a "de minimis" release.
D: None of the above.
A
storage cylinder of recovered R-22 at
normal room temperature (about 75 degrees
F), in the absence of non-condensables, will
be pressurized to;
A:
B:
C:
D:
250 psig.
200 psig.
175 psig.
130 psig.
A storage cylinder of recovered R-500 at
normal room temperature (about 75 degrees
F), in the absence of nun-condensables, will
be pressurized to;
A:
B:
C:
D:
30 psig.
75 psig.
95 psig.
120 psig.
Refrigerants (i.e., R-12, R-22, R500, etc.) in large quantities can
cause suffocation because;
A: they smell strong and make breathing
difficult.
B: they are lighter than air and cause
dizziness.
C: they are heavier than air and displace
oxygen.
D: they sting the nose and cause
sneezing.
At high temperatures, (i.e., open flames,
glowing metal surfaces, etc.) R-12 and
R-22 can decompose to form;
A:
B:
C:
D:
hydrozine gas.
phosgene gas.
helium gas.
None of the above.
Portable refillable tanks or containers
used to ship CFC or HCFC refrigerants
obtained with recovery equipment must
Meet what standard (s)?
A:
B:
C:
D:
Department of Transportation.
Community Right-To-Know Act.
Underwriters Laboratories.
All of the above.
If a large leak of refrigerant occurs such as
from a filled cylinder in an enclosed area, what
action should be taken when no self-contained
breathing apparatus is available?
A: Use butyl lined gloves and try to stop
the leak.
B: Use a leak detector to locate the leak
and try to stop the leak.
C: Vacate and ventilate the spill area.
D: All of the above.
TYPE II
After installation of a field-piped split
system, the unit should first be;
A: evacuated.
B: pressurized with R-22/leak checked.
C: pressurized with R-12/leak checked.
D: pressurized with nitrogen/leak
checked.
Many refrigeration units use an open
compressor. Which part of the
compressor is most likely to leak if a
unit is not used for several months?
A:
B:
C:
D:
The suction service valve.
The rotating shaft seal.
The oil drain plug.
The discharge service valve.
EPA regulations require that all appliances containing
more than 50 pounds of refrigerant (except for
commercial and industrial process refrigeration) be
repaired when the leak rate exceeds ____ percent of the
charge per year.
A:
B:
C:
D:
0
15
25
35
EPA regulations require that leaking
commercial and industrial process refrigeration
be repaired when the leak rate exceeds ____
percent of the charge per year.
A:
B:
C:
D:
0
15
25
35
Refrigerant has been recovered from an airconditioning system and held in a refillable
cylinder, in order to replace the condenser coil.
The refrigerant;
A: can probably be charged back into the
system.
B: should probably be replaced with R123.
C: must be reclaimed.
D: must be destroyed.
Your recovery/recycling machine has R-502
refrigerant in it. You now have to recover
refrigerant from a unit with R-22. What must be
done before the R-22 refrigerant can be
recovered/recycled?
A: Nothing, as long as the recovery machine is
not full.
B: Change the expansion valve on the
recovery machine.
C: Change the filter and expansion valve on
the recovery machine.
D: Recover as much of the R-502 from the
recovery unit as possible, change filter, and
evacuate.
Recycling or recovery equipment using
hermetic compressors has the potential to
overheat when drawing deep vacuums
because;
A: it runs faster than other equipment.
B: the motor relies on the flow of refrigerant
through the compressor for cooling.
C: it has a higher compression ratio limit than
other equipment.
D: the oils used in hermetic compressors burn
at lower temperatures than the oils used in
other equipment.
Refrigerant should be removed
from the condenser outlet
when;
A:
B:
C:
D:
the condenser is below the receiver.
the condenser is on the roof.
the compressor is inoperative.
the evaporator has a small leak.
With an air-cooled condenser on the roof
of a building and the evaporator on the
first floor, recovery should first occur;
A: from the vapor line entering the
condenser.
B: from the discharge of the compressor.
C: from the liquid line entering the
evaporator.
D: on the suction side of the compressor.
Recovering refrigerant from a
system in vapor phase will
minimize loss of;
A:
B:
C:
D:
water.
oil.
refrigerant.
All of the above.
Before using a recovery unit to
remove a charge, what steps should
be taken?
A:
B:
C:
D:
Check service valve positions.
Check recovery unit oil level.
Evacuate recovery unit / receiver.
All of the above.
You can save time recovering the
refrigerant from a system by removing
as much as possible in the ____ phase?
A:
B:
C:
D:
final
initial
liquid
vapor
Which of the following repairs would
ALWAYS be considered "major" under
EPA's regulations?
A: Replacement of an evaporator coil.
B: Replacement of a filter-drier.
C: Replacement of a schraeder valve core.
D: Replacement of a condenser fan
motor.
Appliances containing CFC
refrigerants can be evacuated to
atmospheric pressure when;
A: the repair is major.
B: the repair is followed by an evacuation
of the appliance to the environment.
C: leaks in the appliance make evacuation
to the prescribed level unattainable.
D: the appliance is being disposed.
You are changing out the compressor of a system
containing 40 pounds R-502. Your recycling equipment
was manufactured AFTER November 15, 1993. In
addition to isolating the compressor as much as possible,
which of the following procedures should you follow?
A: Simply remove the compressor.
B: Evacuate the isolated section of the system to
atmospheric pressure, then remove the compressor.
C: Evacuate the isolated section of the system to 10
inches of vacuum and hold. If system pressure does
not rise, remove the compressor.
D: Evacuate the isolated section of the system to 15
inches of vacuum and hold. If system pressure
does not rise, remove the compressor.
Which of the following statements is NOT true
of recycling and recovery equipment
manufactured AFTER November 15, 1993?
A: It must be tested by an EPA-approved third
party.
B: It must meet vacuum standards more
stringent than those met by equipment
manufactured BEFORE November 15, 1993.
C: It must be equipped with low-loss fittings.
D: It must have an oil separator.
When using recovery and recycling equipment
manufactured BEFORE November 15, 1993, technicians
must evacuate an appliance containing 10 pounds of
CFC-500 to the following level before disposing of the
appliance:
A:
B:
C:
D:
0 psig.
4 inches of Hg vacuum.
10 inches of Hg vacuum.
15 inches of Hg vacuum.
When using recovery and recycling equipment
manufactured AFTER November 15, 1993, technicians
must evacuate an appliance component containing MORE
than 200 pounds of CFC-12 to the following level before
making a major repair:
A:
B:
C:
D:
0 psig.
4 inches of Hg vacuum.
10 inches of Hg vacuum.
15 inches of Hg vacuum.
After reaching the required
recovery vacuum on an appliance,
you should;
A: immediately disconnect the recycling or
recovery equipment and open the system
for service.
B: wait for at least a few minutes to see if the
system pressure rises, indicating that there
is still refrigerant in liquid form or in the oil.
C: immediately break the vacuum with
nitrogen and open the system for service.
D: immediately pressurize the system with
nitrogen and perform a leak check.
If a system is opened for
servicing, which of the
following should be replaced?
A:
B:
C:
D:
Filter drier.
Thermostat.
Metering device.
Crankcase heater.
The state of the refrigerant leaving
the receiver of a refrigeration
system is;
A:
B:
C:
D:
low pressure liquid.
low pressure vapor.
high pressure liquid.
high pressure vapor.
When evacuating a vapor compression
system, the vacuum pump should be
capable of pulling a vacuum of;
A:
B:
C:
D:
2 mm Hg.
1 mm Hg.
1000 microns.
500 microns.
Refrigerant cannot be recovered
without isolating a parallel
compressor system because of;
A:
B:
C:
D:
the service valve connection.
the electrical connections.
an open equalization connection.
the thermal bleed connection.
Every refrigerating system
shall be protected by;
A:
B:
C:
D:
a pressure relief device.
a properly located stop valve.
a low pressure control.
a refrigerant receiver.
For what refrigerant (s) is an equipment
room refrigerant monitor required under
ASHRAE Standard 15?
A:
B:
C:
D:
R-12.
R-134a.
R-11.
All of the above
TYPE III
Charged low pressure refrigeration
machines may be most efficiently
leak checked by;
A: adding dry nitrogen.
B: adding HCFC-22.
C: raising system pressure by heating
with circulated hot water or heating
blankets.
D: operating the purge system.
A hydrostatic tube test kit
will;
A:
B:
C:
D:
determine if a tube leaks.
blow all water out of tubes.
remove water from a machine.
vent refrigerant to the atmosphere.
Where would you place a leak detector
probe to check gas leaks into the water
box with water removed?
A:
B:
C:
D:
At the rupture disc.
Through the vent valve.
Through a test plug.
Through a drain valve.
EPA regulations require that leaking
commercial and industrial process refrigeration
be repaired when the leak rate exceeds ____
percent of the charge per year.
A:
B:
C:
D:
0
15
25
35
EPA regulations require that all appliances containing more
than 50 pounds of refrigerant (except for commercial and
industrial process refrigeration) be repaired when the leak
rate exceeds ____ percent of the charge per year.
A:
B:
C:
D:
0
15
25
35
R-11 or R-123 system
refrigerant removal starts with;
A:
B:
C:
D:
vapor removal.
liquid removal.
vapor & liquid removal.
oil separation.
With a low-pressure chiller, what
must you do after recovering the
liquid refrigerant?
A:
B:
C:
D:
Recover the vapor refrigerant.
Pressurize system with nitrogen.
Remove the oil from the system.
Solvent-flush entire system.
When leak testing a low pressure
centrifugal with nitrogen, what is
the maximum test pressure?
A:
B:
C:
D:
0 psig.
10 psig.
25 psig.
50 psig.
A typical setting for the high pressure cut-out
control on a recovery unit used for evacuating
the refrigerant from a low pressure chiller is;
A:
B:
C:
D:
2 psig.
5 psig.
10 psig.
15 psig.
When removing oil from a low
pressure system, the temperature
should be 130°F because;
A: you can warm your hands on the
container.
B: less refrigerant will be contained in
the oil at the higher temperature
C: warmer oil has a lower . viscosity and
flows more easily.
D: it shows that the heater is working.
According to ASHRAE Guideline 3-1996, if the
pressure in a system rises from 1 mm Hg to a
level above __ during a standing vacuum test,
the system should be checked for leaks.
A:
B:
C:
D:
1.5 mm Hg.
2.0 mm Hg.
2.5 mm Hg.
3.0 mm Hg.
How do you determine when enough
vapor has entered the refrigeration
system before you charge refrigerant
liquid?
A: Refrigerant saturation temperature
increases to 36 degrees F.
B: Recovery unit liquid level drops.
C: Vapor charge for 15 minutes.
D: Recovery unit pressure drops.
After system servicing, why is refrigerant
vapor re-introduced to the refrigeration
system before refrigerant liquid?
A: Vapor charging increases pressure slowly,
preventing failure of the rupture disk.
B: Vapor charging is faster than liquid
charging.
C: Liquid charging is more difficult to control
than vapor charging.
D: Liquid charged into a deep vacuum will boil
and may lower temperatures enough to
freeze water in the tubes.
When using recovery or recycling equipment
manufactured BEFORE November 15, 1993,
technicians must evacuate low-pressure
appliances to the following level before making
a major repair:
A:
B:
C:
D:
0 psig.
15 inches of Hg vacuum.
25 inches of Hg vacuum.
25 mm of Hg absolute.
Appliances need not be evacuated
all the way to the prescribed level
when;
A: the repair is major.
B: the repair is followed by an
evacuation of the appliance to the
environment.
C: leaks in the appliance make
evacuation to the prescribed level
unattainable.
D: the appliance is being disposed.
After reaching the required
recovery vacuum on an appliance,
you should;
A: immediately disconnect the recycling or
recovery equipment and open the system
for service.
B: wait for at least a few minutes to see if the
system pressure rises, indicating that there
is still refrigerant in liquid form or in the oil.
C: immediately break the vacuum with
nitrogen and open the system for service.
D: immediately pressurize the system with
nitrogen and perform a leak check.
Which of the following repairs
would ALWAYS be considered
"major" under EPA's regulations?
A: Replacement of an evaporator coil.
B: Replacement of a filter-drier.
C: Replacement of a switch.
D: Replacement of a purge unit.
When using recovery and recycling equipment
manufactured AFTER November 15, 1993,
technicians must evacuate low-pressure
appliances to the following level before disposing
of the appliance:
A:
B:
C:
D:
0 psig.
15 inches of Hg vacuum.
25 inches of Hg vacuum.
25 mm of Hg absolute.
Under EPA's regulations, which of the following
methods can be used to pressurize an R-11 or R-123
system for the purpose of opening the system for a
non-major repair?
A:
B:
C:
D:
Adding nitrogen.
Warming the refrigerant
Adding compressed air.
Adding carbon dioxide.
Refrigerant-11 at a pressure of
18.1 inches Hg vacuum has a
saturation temperature of;
A:
B:
C:
D:
28 degrees F.
32 degrees F.
36 degrees F.
40 degrees F.
The PRIMARY purpose of a purge
unit on a CFC-11 chiller is to;
A: remove CFCs from the system.
B: condense air out of the system.
C: condense water out of the system.
D: remove non-condensables from the
system.
On a centrifugal system, the
purge unit takes its suction
from the;
A: top of the condenser.
B: compressor oil sump.
C: top of the evaporator.
D: suction elbow.
Refrigerant is added to a centrifugal
machine through the;
A: float valve.
B: compressor service valve.
C: condenser charging valve.
D: evaporator charging valve.
Under what code group of
ASHRAE Standard 34 does R123 fall?
A:
B:
C:
D:
Al
A2
Bl
B2
Which of the following safety
precautions should be adhered to
for low pressure systems?
A: Do not siphon refrigerant by mouth.
B: Avoid spilling liquid refrigerant on the
skin.
C: Use gloves and safety goggles when
working with liquid refrigerant.
D: All of the above.
THE END!!!!