WorksheetsEPA 608 100
Total questions: 101
Worksheet time: 4hrs 33mins
How many chlorine atoms does it take to destroy 100,000 ozone molecules in the stratosphere?
10
1
100
10,000
Which of the following refrigerants is a CFC-type refrigerant?
R-22
R-123
R-134a
R-12
Which of the following is an example of an HCFC refrigerant?
R-12
R-402
R-22
R-134a
Which of the following refrigerants is considered an HFC-type of refrigerant?
R-134a
R-12
R-22
R-11
Which type of refrigerant has the highest Ozone Depletion Potential (ODP)?
HFC
HCFC
CFC
All have the same ODP.
What effect is ozone depletion having on the environment?
increased ground level ozone (smog)
reduced marine life
reduced crop yields
all of the above
The abbreviation for refrigerants containing chlorine, fluorine, and carbon is ____.
HFC
HCFC
CFC
HFAC
The abbreviation for refrigerants containing hydrogen chlorine, fluorine, and carbon is ____.
HFC
HCFC
CFC
HFAC
The abbreviation for refrigerants containing fluorine, carbon, and hydrogen is ____.
HFC
HCFC
CFC
HFAC
To reprocess refrigerant to meet new product specifications is called ____.
recovery
renew
reclaim
recycle
To clean refrigerant by the use of filter dryers and then reuse it is called ____.
recovery
renew
reclaim
recycle
To remove the refrigerant from a system without any testing or processing and to be put back into the same system is called ____.
recovery
renew
reclaim
recycle
Refrigerants that are made up of two refrigerants that, when blended in the right proportions, combine to make a third stable refrigerant, are called ____.
blends
azeotropes
near azeotropes
mixtures
The ozone depletion potential of R-12 is ____.
0.8
0.016
0.05
1.0
The DOT-approved cylinder used for recovering refrigerant is _________.
gray top yellow bottom
gray bottom white top
gray bottom yellow top
gray and yellow striped
The Clean Air Act requires a technician to be certified to handle refrigerants as of what date?
11/15/93
7/1/1992
11/14/1994
1/1/2001
Which agency has to approve refrigerant cylinders before they can be transported?
ARI
EPA
DOT
IRS
What is the state of refrigerant as it is leaving the condenser?
low pressure liquid
high pressure liquid
low pressure gas
high pressure gas
Which of the following refrigerants does not contain chlorine?
R-22
R-134a
R-12
R-11
Over evacuation of a system
causes the tubes to collapse.
damages the vacuum gauges.
causes vacuum pump damage.
does not occur.
Ozone in the stratosphere above the earth consists of:
molecules containing 3 oxygen atoms
molecules containing 2 oxygen atoms
radioactive particles
pollutants that have risen from ground level
Which of the following is an approved "drop-in" replacement for R-12?
HFC-134a
HFC -125
CFC-502
none of the above
The state of the refrigerant entering the compressor is?
lowpressure liquid
low pressure vapor
high pressure liquid
high pressure vapor
While servicing a system, the technician discovers that some R-502 was added to a R-22 system. The technician should:
vent the refrigerant since it cannot be reclaimed.
recycle the refrigerant.
recover the refrigerant into a separate tank.
recover and use it in a different system.
What is being done in the U.S. to stop damage to the stratospheric ozone layer?
using natural gas instead of coal to generate electricity.
capturing and ultimately eliminating use of CFCs
enforcing strict emission requirements on incinerators.
all of the above
Type I certification defines small appliances as products that are manufactured, fully charged, and hermetically sealed in a factory with____pounds or less of refrigerants.
5
10
7
15
A drop-in replacement for R-12 is...
R-22
R-123
R-134a
none of the above
A Type I Technician can service package terminal air conditioners with a charge not exceeding.
5 lb.
10 lb.
15 lb.
none of the above.
In order to service small appliances, a technician must be certified.
Type II
Type III
Type I or Universal
All of the above.
Different refrigerants may be mixed in a single recovery cylinder.
any time you don't know what refrigerant you are recovering.
as long as you mark the cylinder with the name of each refrigerant.
never.
only if the refrigerant is going to be reclaimed.
Once you become certified, the law states that you must repair all leaks in small appliances.
True
False
It depends on the size of the leak
All of the above
If the appliance compressor dose not run in passive recovery, it is required that you...
recover from both the high and low side.
recover from the high side only.
recover from the low side only
not recover, just vent the refrigerant to the air.
A container of new R-12 is color coded.
light blue
orange
white
green
Which group of refrigerants does not harm the ozone layer?
CFC
HCFC
HFC
All of the above
When you are finished with a disposable refrigerant cylinder you should
dispose of it in a construction dumpster
refill it again as long as you do not use a CFC
recover any refrigerant, render the cylinder unusable, and properly dispose of it
use it as an air tank
CFC's were no longer produced after what year?
1992
1994
1995
1998
When using nitrogen, the nitrogen tank must be equipped with...
an automatic shut-off.
low loss fittings
a regular and pressure relief valve
a purge device.
When brazing or exposing refrigerants to open flames or red hot metal,
R-12 and R-22 can form a phosgene gas.
R-12 and R-22 can form hydrochloric and hydroflouric acids
ensure you are in a well ventilated area.
All of the above
When brazing or exposing refrigerants to open flames or red hot metal,
R-12 and R-22 can form a phosgene gas.
R-12 and R-22 can form hydrochloric and hydroflouric acids
ensure you are in a well ventilated area.
All of the above
What would be the pressure on a tank of R-22 if it was at 70 degrees F.
70 PSIG
41 PSIG
130 PSIG
121 PSIG
Under conditions of ARI 740-1993, recovery devices manufactured before November 15,1993, must...
be able to remove 80% of the refrigerant charge or achieve 4" Hg vacuue.
be able to remove 90% of the refrigerant charge or achieve 4" Hg vacuue, if the compressor is in operation.
be able to remove 80% of the refrigerant charge of achieve 4" Hg vacuue, if the compressor is not operating.
be able to remove 70% of the refrigerant charge or achieve 4" Hg vacuum.
Under conditions of ARI 740-1993, recovery devices manufactured after November 15, 1993, must...
Be able to remove 80% of the refrigerant charge or achieve 4" Hg vacuum.
Be able to remove 70% of the refrigerant charge or achieve 4" Hg vacuum, if the compressor is in operation.
Be able to remove 80% of the refrigerant charge or achieve 4" Hg vacuum, if the compressor is not operating.
Be able to remove 70% of the refrigerant charge or achieve 4" Hg vacuum.
The color code for refrigerant recovery tanks is...
yellow top, gray body.
gray top with a yellow body.
yellow top, white body
all yellow
When using system dependent (passive) recovery, the EPA requires
80% of the refrigerant to be removed if the compressor is operating
80% of the refrigerant to be removed if the compressor is not operating.
90% of the refrigerant to be removed if the compressor is not operating
70% of the refrigerant to be removed if the compressor is operating
Which of the following refrigerants must be recovered with a current recovery system?
R-12 CFC
R-502 azeotrope
R-717 ammonia
R-22 HCFC
While recovering refrigerant, why is it necessary to install a piercing valve on both the high and the low side of a small appliance that has an inoperative compressor?
It will help drain the oil out of the system while recovering the refrigerant.
It will help decrease the rate of refrigerant evaporating
It is just a waste of time and is not necessary at all
It will decrease the time of the refrigerant recovery
What may cause a pungent odor in a CFC or HCFC system?
A burnt compressor
An overcharged system.
A defective filter dryer
A dead mouse
Which refrigerant is the closest match to R-12 on your pressure temperature chart?
R-22
R-134a
R-502
R-124
If after you install piercing valves on a sealed system you connect your manifold gauges and read 0 psig.
Do not begin the recovery process
You should pressure test the system
Report to the EPA that someone must have vented the refrigerant
Recover as you normally
ARI 740 deals with
recovery equipment
venting CFC's
technicians becoming certified to buy refrigerants
homeowners maintaining refrigerant logs on all pieces of equipment in the home that contain refrigerant
EPA definition of a small appliance would include
a small residential window air conditioner
a home dehumidifier
a water cooler
all of the above
Type II certification applies to-
high and very high pressure refrigerants
low pressure refrigerants
appliances with charges less than 5 lbs.
low pressure chillers
Recovery speed can be increased by
placing the recovery vessel in hot water
placing the recovery vessel in ice water
using an oversized recovery cylinder
using longer hoses leading to the recovery tank
After installation of a refrigeration system, the technician should first
evacuate the system
pressure test the system using R-22
pressure test the system using nitrogen
charge the system using the correct refrigeration
What maintenance task must always be done to recovery/recycle equipment?
Change the system's oil and filters
vacuum test the equipment after every system recovery/
pressure test the equipment after every recovery
change the pressure gauges after every 25 recovery cycles
What type of leak detection device is used to pinpoint a leak?
An electronic leak detector
soap bubbles
an ultrasonic leak detector
a halide torch
An open compressor that has sat for several months is most likely
not to operate due to seized bearings
to leak from the shaft seal
to need a hard start kit
to need to have its oil changed
Two indications that a high pressure system has a leak are
oil traces on flared fittings and high superheat
low super heat and bubbles in the sight glass
low super heat and low sub-cooling
high head pressure and low super heat
EPA defines a Major Repair as
replacing a compressor
replacing a condenser
replacing an evaporator
all of the above
Under the exceptions to required evacuation levels, an appliance can be evacuated to 0 psig when
the appliance is being thrown away
the repair consists of a condenser replacement
the required levels cannot be reached due to leaks
all of the above
Refrigerant should be recovered as
vapor first
liquid first
liquid from the low side first
vapor from the low side first
The EPA requires the all comfort cooling systems with more than a 50 lbs. charge be repaired when the annual leak rate exceeds
15%
25%
35%
50%
The EPA requires that all commercial and industrial process refrigeration equipment with more than a 50 lb. charge be repaired when the leak rate exceeds
15%
25%
35%
50%
Why is it likely for recovery and recycling machines to overheat when drawing a deep vacuum?
because a deep vacuum causes high head pressure
because refrigerant is needed to cool the compressor
because the refrigerant oil has evaporated
a recovery and recycling machine would not overheat when drawing a deep vacuum
What component is directly after the condenser on a system that uses a TXV as a metering device?
the TXV
a reciever
a filter dryer
an accumulator
After removing refrigerant from a system, the refrigerant
may be recycled and sold to another customer
may be reused in the same system, or in another system owned by the same person
may not be reused
must be reclaimed
Noncondensables (air) in an appliance cause
low superheat
high head pressure
low suction pressure
low head pressure
Defined by ASHREA standard 15, a sensor and alarm are required for A-1 refrigerants
to sense oxygen depletion
to sense ozone depletion
to sense CFCs
to sense carbon monoxides
When using recovery and recycling equipment manufactured after November 15, 1993, technicians must evacuate an appliance containing more than 200 lb. of HCFC-22 to what level before making a major repair?
0 psig
4" Hg
10" Hg
30" Hg
When using recovery and recycling equipment manufactured before November 15, 1993, technicians must evacuate an appliance containing less than 200 lb. of HCFC-22 to what level before making a major repair?
0 psig"
4" Hg
10" Hg
30" Hg
When servicing an open system, which of the following should always be replaced?
filter dryer
sight glass
pressure control
relief valve
In a refrigeration system, high pressure liquid exits
the condenser and metering device
the receiver and metering device
the evaporator and the compressor
the condenser and the receiver
A technician must never
front seat the discharge service valve while the compressor is in operation
front seat the king valve while the compressore is in operation
back seat the the discharge service valve while the compressor is in operation
mid-seat the suction service valve while the compressor is in operation
When evacuating a system, it is required that the vacuum pump pull a minimum of
50 microns
500 microns
1000 microns
5000 microns
Type II technicians are certified to service
all refrigeration equipment containing more than 5 pounds of refrigerant
high pressure equipment only
high pressure and very high pressure equipment, including small appliances and motor vehicle a/c
high pressure and very high pressure equipment, excluding small appliances and motor vehicle a/c
The sale of CFC and HCFC refrigerants has been restricted to certified technicians since
November 15, 1993
July 1, 1992
December 31, 1995
November 14, 1994
If the EPA regulations change after a technician has been certified
the technician will be "grandfathered" into the new changes
this will only affect technicians who have not yet been certified
it is the technicians responsibility to comply with all future changes
this will only affect technicians who have been certified after January 1, 2000
Why is it easier to have air enter gaskets and fittings on a low pressure system than on a high pressure system?
because air is attracted to R-11 and R-123 more than to R-12 and R-22
because a low pressure system operates in a vacuum
because low pressure systems often use a centrifugal compressor
because low pressure systems often use gaskets that are semi-permeable
At what pressure does a rupture disk open on a low pressure system?
10 psig
15 psig
20 psig
25 psig
What is the easiest way to leak test a low pressure system?
connect your gauges and add 15 psig of nitrogen
connect your gauges and add 150 psig of nitrogen with a trace amount of R-22
Add warm water over the coils until you reach 10 psig
recover all refrigerant, then pull the system down to a 500 micron vacuum and see if the vacuum holds
Why is it important not to exceed 10 psig when leak testing a low pressure system?
Because the relief valve on the reciever would blow
Because the condenser test pressure is 10 psig max.
because the rupture disc on the evaporator could fail
because the shaft seals cannot withstand more than 10 psig without leaking
When using an electronic leak detector, where is a water box leak tested after the water has been removed?
at the drain valve
at the rupture disk
at the inlet valve
at the shaft seal
What is used when leak testing a water tube on a low pressure chiller?
a hydrometer
a psychrometer
a manometer
a hydrostatic tube test kit
The EPA requires that all comfort cooling systems with more than 50 lb. of refrigerant be repaired when the annual leak rate exceeds
50%
30%
25%
15%
The EPA requires that all commercial and industrial process refrigeration systems with more that 50 lb. of refrigerant be repaired when leak rates exceed
15%
25%
35%
50%
What pressure is a high-pressure cut-out set for on a recovery system that is used on low-pressure refrigeration systems?
10 psig
15 psig
20 psig
25 psig
When recovering R-11 or R-123 from a low pressure system, always recover
liquid first
vapor first
vapor and liquid at the same time
none of the above
What is commonly done to prevent a low pressure system from freezing during evacuation?
stop the water from running through the chiller tubes
run the water through the chiller tubes
remove the water from the chiller tubes
add salt to the water in the tubes to prevent freezing
What does the ASHREA guide line 3-1990 state about a vacuum test?
If a 1 mm Hg vacuum level rises to 2.5 mm Hg, the system should be leak tested
If a 1 mm Hg vacuum level rises to 2.5 mm Hg, the system is not leaking
If a 1 mm Hg vacuum level rises to 2.5 mm Hg, the chiller coil should be replaced
If a 1 mm Hg vacuum level rises to 2.5 mm Hg, the system is in danger of blowing off the relief valve
How is refrigerant added to a low pressure chiller system after it has been evacuated?
By use of a king valve
By use of the suction service valve
By use of the evaporator charging valve
By use of the master charge valve
After a chiller system has had a deep system evacuation, what is commonly done to decrease the possibility of a system freeze-up prior to a liquid charge?
Pressurize the system with liquid up to 36 degrees F saturation temperature
Pressurize the system with vapor up to 36 degrees F saturation temperature
Pressurize the system with liquid or vapor up to 20 degrees F saturation temperature
Pressurize the system with liquid up to 36 psig
When using recovery or recycling equipment manufactured or imported before November 15, 1993 the required level of evacuation for low pressure equipment is
25 mm Hg absolute
25" Hg
27" Hg
30" Hg
What is used on a low pressure chiller to remove non-condensables from the system?
a vent system
an aerator
a purge unit
a relief valve
From where does the purge unit remove trapped air in a low pressure system?
the top of the evaporator
the top of the receiver
the top of the condenser
the top of the accumulator
The equipment room that contains a chiller using R-123 group B-1 refrigerant requires a(n)
carbon monoxide sensor
ozone depletion sensor
refrigeration sensor
smog sensor
It is important to recover the vapor refrigerant in a chiller after the liquid has been removed, since there are approximately ____ lbs. of vapor in a common 350 ton R-11 chiller
25
50
75
100
Refrigerants
are heavier than air
are lighter than air
are the same weight as air
always have enough oxygen to maintain the necessary levels
Heating the refrigerant cylinder during charging will result in
faster vapor transfer
slower moving liquid
nothing that will affect the process
a slower charging process
R-123 is code grouped as a(n) _____ refrigerant
A-1
A-2
B-1
B-2
To protect from over pressurization, low pressure chillers typically use a rupture disc mounted on the
condenser
compressor
metering device
evaporator
Once the technician has reached the required level of vacuum when recovering a system, they should wait a few minutes and monitor the system. If the pressure rises, indicating that there is _________ in the system, recovery must be repeated.
nitrogen
refrigerant
ozone
non-condensables
