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To obtain an accurate vacuum readings during system evacuation, the system vacuum gauge should be located: as far from the vacuum pump as possible
When moisture exists in an operating system, which of the following is the most likely occur? Acid will form.
What factor(s) affects the speed of evacuation? 1)The size of the equipment being evacuated 2)The ambient temperature 3)The amount of moisture in the system
A system is dehydrated to: Remove water and water vapor
The evacuation of a system is a method of: dehydration
When evacuating a sytsem, the hoses should be: equal to or larger than vacuum pump inlet connection
Measuring the system's final vacuum is always with: the system isolated and the vacuum pump off
Refrigerant vapors or mist should not be inhaled because: they may cause heart irregularities and/or unconsciousness
A refillable refrigerant cylinder must never be filled to more than _____ of its capacity by weight: 80%
Refrigerant cylinders should always be: 1) free of rust and damage 2) color coded to indicate the contents 3) secure
Which safety precautions(s) should always be followed: 1) Never apply an open flame to a refrigerant cylinder 2) Never cut or weld any refrigerant line when refrigerant is in the line 3) Never use oxygen to purge lines or to pressurize a system
When using recovery unit, the fill level of the recovery tank can be controlled by: 1) a mechanical float switch 2) an electronic shut-off device 3) weight
Whenever dry nitrogen from a portable cylinder is connected to a system, what item is of most importance in consideration of safety? There is a relief valve in the downstream line from the pressure regulator
Ozone depletion potential, or "ODP" is: A measure of the ability of CFCs' and HCFCs' to destroy ozone
An example of an HCFC refrigerant is: R-22
When transporting cylinders containing used refrigerant, the DOT requires that you: attach DOT classification tags
It is necessary to place a refrigerant label on: a refrigerant cylinder which is being returned for reclaiming
Refrigeration technicians who violate the Clean Air Act can: 1) lose their EPA certification 2) be fined 3) be required to appear in Federal court
The type of oil that is most commonly used in stationary refrigeration applications with HFC-134a refrigerant is: ester oil
In a vapor compression refrigeration system, cooling occurs when: refrigerant liquid turns to a vapor
_________refers to the process of cleaning refrigerant by oil separation and single or multiple passes through filter-driers, which reduce moisture and acidity? recycling
According to the EPA, a _______ leak detection methods is considered to be the most effective for locating the general area of a small leak Electronic or Ultrasonic tester
When a system will not hold a vacuum after it has been evacuated, then: the system may be leaking
We dealing with small systems, how many different refrigerants may be recovered into the same cylinder? only one
If the EPA regulations should change after a technician becomes certified: it is the technician's responsibility to comply with any future changes in the law
The EPA Section 608 certification must be renewed every: The EPA certification has no expiration date
You are changing the compressor of a system containing 12 pounds R-410A. Your recycling equipment was manufactured AFTER November 15, 1993. You must reach a vacuum of at leas ____ inches of vacuum with the recovery or recycling machine 0
Recovery or recycling equipment which was manufactured after November 15, 1993 and is used to recover refrigerant from small appliances prior to disposal of the small appliances must be used to: 1) recover 80% of the refrigerant in an appliance's compressor is inoperative. 2) recover 90% of the refrigerant in an appliance if the appliance's compressor is operational
Technicians with a Type I small appliance certification are certified to recover refrigerant during the maintenance, service or repair of: packaged terminal air conditioners ("PTACs) with 5 pounds or less of refrigerant
A Very-High-Pressure appliance is one that uses a refrigerant with a liquid phase saturation pressure above 305 psia at 104F. This definition includes but is not limited to appliances using which of the refrigerants listed below: 1) R-410A 2) R-13 3) R-503
The sale of refrigerant is: restricted to technicians who are EPA certified in refrigerant recovery
For which of the following refrigeration systems/appliances would it be permissible to use a passive recovery device for refrigerant recovery? a domestic refrigerator
EPA regulations require the capture of at least 80% of the refrigerant from a small appliance with a non-operating compressor if the technician is using: 1) a system-dependent (passive) recovery unit 2) a self-contained (active) recovery unit
When ever nitrogen is used to pressurize or blow debris out of the system: only nitrogen vapor should be used
A recovery cylinder which is half full of recovered R-22 at normal room temperature (about 75F), in the absence of non-condensables, will be pressurized to: 130 psig
Small amounts of refrigerant have no odor, therefore if a pungent odor is detected during a system recovery and/or repair: a compressor burn-out has likely occurred
If a reclamation processing plant is given a recovery tank containing a mixture of refrigerants, they can: 1) refuse to process the refrigerant and return it 2) agree to destroy the refrigerant, but typically a substantial fee is charged for the destruction
When ever nitrogen is used to pressurize or blow debris out of the system, the nitrogen: can be vented
When R-500 is recovered from an appliance, it: must be recovered into its own recovery vessel (or a recovery cylinder that already contains some R-500)
A standard vacuum pump designed specifically for evacuation and dehydration can: be only used as a recovery device in combination with a non-pressurized container
A recovery cylinder which is half full of recovered R-500 at normal room temperature (about 75F), in the absence of non-condensables, will be pressurized to: 95 psig
After installing and opening a piercing access valve, if the system pressure is ____ do not begin the recovery procedure 0 psig
When using a passive-dependent recovery process, you should access both the high and low side of the system for the refrigerant recovery if __________. the system's compressor does not run
A refrigerant that can be used as a direct service "drop-in" substitute for R-22 in a small appliance is: None of the above (R-410A, R134a, R-141b)
When transporting refrigerants, DOT (Department of Transportation) Regulation number 49 CFR requires ____________ to be recorded on the shipping papers for hazard class 2.2, Nonflammable compressed Gases? number of cylinders of each gas
If a large leak of refrigeration occurs in an enclosed area and no self-contained breathing apparatus is available, then the technician should: vacate and ventilate the spill area
Large spills of refrigerants can cause suffocation because: they are heavier than air and displace oxygen
When using any equipment or servicing any system that has schraeder valves, it is "critical" to: 1) inspect the schraeder valve core for bends and breakage 2) replace any damaged schraeder valve core to prevent leakage 3) can the schraeder ports to prevent accidental depression of the valve core
If R-12 or R-22 are exposed to high temperature, (from open flames or glowing hot metal surfaces for example), these refrigerant can decompose to form: hydrochloric and hydrofluoric acids
Created by: toolegit on 2010-03-12

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