Home Buyers Guide - Lorain County JVS

Report
Section 608 Certification
Pre-Test
Mr. Morgan
HVAC/R Instructor
1
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.
2
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.
3
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.
4
Ozone in the stratosphere above the
earth consists of;
A:
B:
C:
D:
molecules containing 3 oxygen atoms.
molecules of 2 oxygen atoms.
radioactive particles.
pollutants that have risen from ground
level.
5
Which compounds have the highest
ozone depletion potential (ODP)?
A:
B:
C:
D:
HCFCs.
HFCs.
CFCs.
All are equal.
6
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.
7
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.
8
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.
9
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.
10
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.
11
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.
12
Which atom of the CFC molecule causes
ozone depletion?
A: Fluorine.
B: Chlorine.
C: Carbon.
D: Hydrogen.
13
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.
14
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.
15
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.
16
Refrigerant entering the compressor of a
refrigeration system is a;
A: liquid
B: sub-cooled liquid
C: sub-cooled vapor
D: superheated vapor
17
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.
18
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".
19
How should refrigerant cylinders be
positioned when they are shipped?
A:
B:
C:
D:
Inverted.
Upright.
Horizontally.
Stacked.
20
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
21
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.
22
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.
23
The oils that will be employed with most
of the HFC-134a refrigeration
applications are;
A: esters.
B: alkylbenzenes.
C: whale oils.
D: All oils are compatible with HFC-134a.
24
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.
25
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: recycling.
B: recovering.
C: reclaiming.
D: restoring.
26
TYPE I
27
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.
28
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.
29
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.
30
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.
31
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.
32
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".
33
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.
34
EPA rules require capture of 80% of the
refrigerant from a small appliance sealed
system with a non-operating compressor if
technicians are using;
A:
B:
C:
D:
a system-dependent (passive) process.
a self-contained (active) process.
Either recovery process.
Neither recovery process.
35
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.
36
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 R500.
37
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".
38
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".
39
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 PA
certified in refrigerant recovery.
40
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.
41
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.
42
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 non-pressurized
container.
D: can only be performed on a system with
an operating compressor.
43
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"
44
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".
45
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.
46
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.
47
When a household refrigerator compressor does
not run, it is recommended that low and high side
access valves be installed when recovering
refrigerant from the system because;
A: it can enhance the speed of recovery.
B: it may be necessary to achieve required
recovery efficiency.
C: otherwise, the refrigerator's compressor
may be damaged.
D: Both "A" and "B".
48
Refrigerants (i.e., R-12, R-22, R-500,
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.
49
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.
50
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.
51
When filling a graduated charging
cylinder, refrigerant that is vented off
the top of the cylinder;
A:
B:
C:
D:
need not be recovered.
must be recovered.
is considered a "de minimis" release.
None of the above.
52
TYPE II
53
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.
54
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.
55
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.
56
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.
57
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.
58
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.
59
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
60
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 R-123.
C: must be reclaimed.
D: must be destroyed.
61
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.
62
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.
63
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.
64
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
65
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.
66
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.
67
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.
68
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
69
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.
70
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.
71
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.
72
Recovering refrigerant from a system in
vapor phase will minimize loss of;
A:
B:
C:
D:
water.
oil.
refrigerant.
All of the above.
73
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.
74
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.
75
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.
76
Which of the following repairs would
ALWAYS be considered "major" under
EPA's regulations?
A:
B:
C:
D:
Replacement of an evaporator coil.
Replacement of a filter-drier.
Replacement of a schraeder valve core.
Replacement of a condenser fan motor.
77
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.
78
TYPE III
79
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.
80
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.
81
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
82
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.
83
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.
84
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.
85
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.
86
R-11 or R-123 system refrigerant
removal starts with;
A:
B:
C:
D:
vapor removal.
liquid removal.
vapor & liquid removal.
oil separation.
87
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.
88
Why do chillers using CFC-11 and
HCFC-123 require purge units?
A: Purge units remove moisture.
B: System operates below atmospheric
pressure.
C: Purge units remove refrigerant from oil
sump.
D: Purge units remove CFCs from the
chiller.
89
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.
90
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
91
After system servicing, why is
refrigerant vapor re-introduced to the
refrigeration system be fore 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.
92
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.
93
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.
94
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.
95
Which of the following repairs would
ALWAYS be considered "major" under
EPA's regulations?
A:
B:
C:
D:
Replacement of an evaporator coil.
Replacement of a filter-drier.
Replacement of a switch.
Replacement of a purge unit.
96
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.
97
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.
98
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.
99
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.
100
Under what code group of ASHRAE
Standard 34 does R-123 fall?
A:
B:
C:
D:
Al.
A2.
Bl.
B2.
101
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.
102
On a centrifugal system, the purge unit
takes its suction from the;
A:
B:
C:
D:
top of the condenser.
compressor oil sump.
top of the evaporator.
suction elbow.
103
Refrigerant is added to a centrifugal
machine through the;
A:
B:
C:
D:
float valve.
compressor service valve.
condenser charging valve.
evaporator charging valve.
104
THE END!!!!
105

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