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Type I 2018
A small appliance is defined as a system that is __________________.
a) manufactured, fully charged, and hermetically sealed in a factory with a charge of 5 pounds or less
b) manufactured, fully charged, and hermetically sealed in a factory with a charge of 15 pounds or less
c) an appliance with a compressor under one-third horsepower
d) any assembly of pre-charged components with a charge of less than 2 pounds per component
A process stub is a ____________________.
a) straight piece of tubing that is entered using a piercing access valve
b) line located at least 3 inches below the compressor
c) service valve installed at the factory
d) stub to allow additional compressors to be connected in parallel
Type I technicians can service any ________________________.
a) appliances with 5 pounds or less of refrigerant that have been hermetically sealed and charged at the factory
b) appliances with 5 pounds or less of refrigerant including split systems
c) open-drive (non-hermetic) system if the charge is less than 5 pounds
d) any MVAC or MVAC-like system
Small appliance servicing requires a ___________ or Universal certification.
a) Type I
b) Type II
c) Type III
d) Type I or II
A __________________ recovery device can be used for Type I small appliance applications or Type II applications if the total charge is below 15 pounds.
What is not a small appliance?
a) An MVAC-like system that holds three pounds of R-22.
b) A water cooler that holds 2 pounds of R-22.
c) A food freezer that holds 4 pounds of R-134a.
d) A dehumidifier that holds seven ounces of R-600a.
A passive recovery device can be used for a ________________.
a) reciprocating liquid chiller with a charge of 100 pounds
b) small commercial walk-in freezer with a charge of 14 pounds
c) domestic refrigerator with a charge of 3 pounds
d) both B and C
Any system with a charge of less than _________ pounds can use system-dependent recovery equipment.
The maximum allowable factory charge for a Type I appliance is _________.
a) 1 pound
b) 3 pounds
c) 5 pounds
d) 7 pounds
You must have a self-contained recovery machine available unless you only work on ________________.
a) small appliances
c) very high pressure systems
d) extremely low pressure units
New household refrigerators with a charge of less than 57 grams (2 ounces weight) can use any of the following refrigerants, EXCEPT ________________.
_________________is an approved refrigerant for new household refrigerators, freezers, and combination refrigeration/freezers.
Which refrigerant does not need to be recovered?
b) carbon monoxide
d) both A and B
An exempt refrigerant is any refrigerant that has a zero-ozone depletion potential (0 ODP) and a global warming potential (GWP) equal to or lower than carbon dioxide, that is a GWP of ___ or less.
_________________ is an exempt refrigerant.
a) Carbon dioxide
b) Ammonia because it is used in absorption and not vapor compression systems
d) All of the above
The hydrocarbon refrigerant approved for retrofit into existing household refrigerators is _________.
a) R-600a if charge is less than 1 ounce
b) R-290 if charge is less than 2 ounces
c) any hydrocarbon if the charge is less than 1 ounce
d) none. Hydrocarbons are not approved for any retrofit applications
Recovery devices for use with small appliances must be capable of _________.
a) Recovering 90% of the refrigerant when the compressor is operating
b) Recovering 90% of the refrigerant when the compressor is NOT operating
c) Achieving a 10-inch vacuum under the conditions of AHRI 740
d) Recovering 70% of the refrigerant when the compressor is NOT operating
Recovery equipment is certified by _________________.
a) an ASHRAE-approved laboratory
b) an EPA-approved laboratory
c) a SNAP-approved laboratory
d) any of the above three organizations can approve the testing laboratory
When recovering refrigerant from small appliances, you must recover ________.
a) at least 85% or the refrigerant
b) at least 90% of the refrigerant with an inoperative compressor and 80% of the refrigerant with an operative compressor
c) at least 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with an operative compressor
d) all the refrigerant down to a vacuum of 500 microns
The sale of reclaimed CFC, HCFC, HFC, and HFO refrigerants is ____________.
b) banned unless you have an approved recovery machine
c) restricted to use in existing units
d) restricted to technicians who are EPA certified in refrigerant recovery
If you encounter a small appliance that is leaking, __________.
a) you must repair the leak within 30 days
b) you must document all attempts to repair the leak
c) you do not have to repair the leak
d) you must recover all remaining refrigerant and dispose of the appliance
Low-loss fittings _____________________.
a) can be either manually closed or automatically closed when disconnected to prevent loss of refrigerant from hoses
b) only leak small amounts of refrigerant during use
c) are no longer required to be used because refrigerants are now greener.
d) reduce oil losses during refrigerant recovery
When checking for non-condensables, _______________.
a) work quickly to prevent safety valves from purging refrigerant
b) always chill the recovery tank before taking a temperature reading
c) always heat the recovery tank before taking a pressure reading
d) make certain the pressure and temperature of the refrigerant are stable and known
Recovered R-410A __________.
a) can be recovered into a recovery tank containing R-32 or R-125 because R-410A is a mixture of those two refrigerants
b) can only be recovered into a tank containing R-407C
c) can only be recovered into a tank containing R-22 and not R-407C
d) can only be recovered into an evacuated tank or a tank containing R-410A
For small appliances, a standard vacuum pump _________________.
a) can be configured as an active recovery device
b) can only be used as a recovery device in combination with an unpressurized container
c) can only be used as a recovery device in combination with a pressurized container
d) can never be used as a recovery device
To reach the necessary recovery level, when using a ____________, it will most likely be essential to heat and strike the compressor with a rubber mallet to release any refrigerant.
a) self-contained recovery device on a small appliance with an operating compressor
b) self-contained recovery device on a small appliance with a non-operating compressor
c) system-dependent active recovery device with an operational compressor
d) passive recovery device on a small appliance with a non-operating compressor
What requires accessing both the high and low side of the system for refrigerant recovery when using a passive recovery process?
a) When the system leaks
b) When the compressor oil is contaminated
c) When the refrigerant contains non-condensable gasses
d) When the compressor does not run
Low- and high-side access valves can be installed instead of a single access valve ___________.
a) to speed-up recovery
b) to prevent contamination
c) to prevent oil recovery
d) to remove acids in the system
When recovering refrigerant from a small appliance with a working compressor, you must recover the refrigerant to a vacuum of _________________.
a) 4 inches of mercury or 90% of the remaining charge
b) 4 inches of mercury or 90% of the nameplate charge
c) 4 inches of mercury or 80% of the remaining charge
d) 500 microns
What is the pressure of a storage cylinder of R-134a that is stored in a room where the temperature is 100 °F?
a) 37 psig
b) 84 psig
c) 124 psig
d) 207 psig
What is the pressure of a storage cylinder of R-410A that is stored in a room where the temperature is 100 °F?
a) 68 psig
b) 238 psig
c) 319 psig
d) 488 psig
What is the pressure of a storage cylinder of R-404A that is stored in a room where the temperature is 100 °F?
a) 68 psig
b) 237 psig
c) 319 psig
d) 488 psig
Which condition can cause excessive pressure on the high side of a self-contained recovery device?
a) When the recovery tank valve is closed.
b) When the recovery tank is extremely hot.
c) When there is a large volume of non-condensable gas in the refrigerant being recovered.
d) Any of the above conditions could cause excessive high-side pressure.
If a recovery cylinder is suspected to be contaminated, measure the ________.
a) pressure of the refrigerant in the cylinder
b) weight of the cylinder
c) weight of the cylinder and subtract the empty cylinder weight to get the refrigerant weight
d) both A and C
The 80% fill level in a recovery tank can be determined by _______________
a) System superheat when a capillary tube is present or sub-cooling when a thermostatic expansion valve is used
b) a float switch in the recovery tank
c) measuring the temperature and pressure in the recovery tank
d) shaking the tank to feel the liquid refrigerant
Recovery of refrigerant cannot begin if the initial pressure in the system is ___________.
a) above 800 psig
b) above 550 psig
c) above 30 psig
d) 0 psig
Solderless piercing valves should never remain permanently installed because they ____________.
a) violate EPA regulations
b) violate SNAP regulations
c) tend to leak over time
d) trap lubricant and cause compressor failure
Which maintenance practice should be performed on a regular basis?
a) Change the vacuum pump oil.
b) Check the recovery equipment for leaks.
c) Check the manifold hose set for leaks.
d) All of the above
When a pungent odor is detected in the oil, ____________.
a) the refrigerant should not be recovered; instead vent it
b) a compressor burnout has probably occurred
c) it is POE oil
d) all of the above
Anytime pressurized nitrogen is put into a system, the nitrogen gas __________.
a) must be recovered
b) may be vented to the ambient air
c) must be returned to the cylinder
d) must be purified before it can be vented
Which refrigerants can be mixed in a system?
a) R-22 and R-407C
b) R-22 and R-410A
c) R-407C and R-410A
d) Refrigerants cannot be mixed
For a system with an operating compressor and a restricted capillary tube, what is the minimum number of access valves needed and where would you place them?
a) Only one access valve on the low side of the system
b) Only one access valve on the high side of the system
c) Two valves, one on the high side and one on the low side of the compressor
d) Three valves, one on the high side and one on the low side of the compressor and the third at the condenser outlet
How can you speed refrigerant recovery from a frost-free refrigerator?
a) Cool the compressor
b) Heat the recovery cylinder
c) Turn on the defrost heater
d) Perform both A and B together
Which of the following is required by the EPA when attaching a gauge set?
a) A red colored high-pressure hose and a blue colored low-pressure hose
b) Self-sealing valves on the ends of the gauge set hoses to minimize any release of refrigerant
c) Manual hand valves on the ends of the gauge set hoses to minimize any release of refrigerant
d) either B or C
You must know the _______________ before beginning a refrigerant recovery.
a) actual charge in the system
b) type of refrigerant that is in the system
c) non-condensable concentration
d) oil type
Any refrigerant that is vented off the top of a charging cylinder_________.
a) does not need to be recovered
b) must be vented because it is full of non-condensables
c) cannot be reclaimed
d) must be recovered
Always look for oil contamination when recovering refrigerant because _______.
a) contaminated oil is hard to remove from the refrigerant
b) contaminated oil indicates the system will need to be flushed
c) contaminates destroy recovery tanks
d) if the refrigerant is contaminated, it does not need to be recovered
A passive system-dependent recovery process _________.
a) uses a pressurized container
b) must still use a pressurized container but no pressure relief device is needed
c) recovers refrigerant in a non-pressurized container
d) needs a system with an operating compressor
If the refrigerant in a system is suspected to be contaminated, you can ________.
a) turn the refrigerant in for reclamation
b) vent the refrigerant because it cannot be recycled
c) mix the refrigerant with nitrogen, call it a trace gas, leak check, and then vent it
d) mix the refrigerant with virgin refrigerant to lower the contamination
When _____________, it is a direct service 'drop-in' substitute for R-22.
a) R-407C is retrofitted into a system with an EXV expansion device
b) R-410A is retrofitted into a system with a TXV that has a MOP of at least 75 psig
c) R-290 is retrofitted into a system with a fixed orifice metering device
d) None of the above. There is no such thing as a 'drop-in' substitute.
When a tank of mixed refrigerant is sent to a reclaimer, they can _____________.
a) refuse to accept the refrigerant
b) charge extra for processing it
c) vent the refrigerant
d) either A or B
A passive system-dependent recovery process ___________.
a) uses a pump to recover refrigerant
b) uses a non-pressurized container
c) can only be performed on a system with an operating compressor
d) can only be performed on a system with an inoperable compressor
When recovering refrigerant using a passive recovery system and the system has an inoperative compressor, it is ______________.
a) helpful to heat and strike the compressor with a rubber mallet to release any refrigerant trapped in and under the compressor oil
b) only necessary to recover the refrigerant that will naturally flow out of the system
c) only necessary to recover the refrigerant that will naturally flow out of the system when the compressor is heated to 100 °F
d) necessary to blow the system oil into the recovery tank with pressurized nitrogen
When installing an access fitting, __________________.
a) it is not necessary to leak test the access fitting because the recovery will be fast
b) the fitting should verified to be leak free before beginning any recovery to avoid drawing air into the recovery tank
c) the fitting should be leak tested before the system is recharged
d) the fitting should be leak tested after the system is recharged
Always _________________ when connecting or disconnection refrigeration hoses.
a) wear safety eyewear and butyl-lined gloves
b) verify the hoses are rated for the refrigerant being used
c) avoid trapping liquid refrigerant in the hoses
d) do all of the above
Nitrogen tanks should always be equipped with a ____________________
a) pressure regulator
b) pressure relief valve downstream of the regulator
c) float switch
d) both A and B
CFC and HCFC refrigerants can decompose to form ______________________.
a) boric acid
b) sulfuric acid
c) hydrochloric and hydrofluoric acids
d) phosphoric acid
At high temperatures, CFC and HCFC refrigerants decompose into __________.
a) hydrazine gas
b) phosgene gas
c) hydrogen gas
d) chlorine gas
If a large leak of refrigerant occurs, _________________________.
a) put on butyl-lined gloves and try to stop the leak ASAP
b) turn off the leak detector because high concentrations of refrigerant will destroy any leak detector
c) immediately vacate and naturally ventilate the area
d) both A and B
A very large refrigerant leak can cause suffocation because refrigerants _______.
a) cause asthmatic symptoms making breathing difficult
b) are lighter than air making breathing difficult
c) are heavier than air and displace oxygen
d) lead to serious lung irritation
HC refrigerant systems require permanent safety markings _________________.
a) on or near any evaporators and near any exposed refrigerant tubing
b) near the machine compartment
c) on the exterior of the refrigerator
d) at all of the above locations
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