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small appliance Correct Answer - An appliance that is hermetically sealed at the factory with five pounds of refrigerant or less is defined as a _____ _____ by the EPA. Type 1 Correct Answer - Technicians handling refrigerant while servicing or repairing small appliances must be certified as either a universal technician or a _______ __ technician. comply Correct Answer - If EPA regulations change after a technician becomes certified, it will be the responsibility of the technician to ____...

One molecule of chlorine can destroy how many molecules of ozone? Correct Answer - 100,000 Ozone has __ atoms of oxygen. Correct Answer - 3 In the United States, when were all CFCs phased out by? Correct Answer - 1995 In the United States, when were R-22 and R-142b phased out? Correct Answer - 2020 In the United States, when will all HCFCs be phased out? Correct Answer - 2030 Section 608 of the Clean Air Act is: Correct Answer - Federal Law What is the fine for violating the Cl...

On a high-pressure system _________ is an indicator of a possible leak. Correct Answer - excessive superheat To change the compressor on a system containing R-410A, you must isolate the compressor then: Correct Answer - Evacuate the isolated section of the system to atmospheric pressure and hold. if system pressure does not rise, remove the compressor. The fastest way to recover refrigerant from a system is to remove it in the __________ phase? Correct Answer - liquid Before using a rec...

Capillary Tube - a passive throttling device comprised of a very small diameter long tube located upstream of the evaporator that drops the pressure in the system, causing refrigerant to flash into a two-phase mixture. It does not actively control the pressure drop to maintain a prescribed superheat at the exit of the evaporator. Correct Answer - Class I Refrigerant - Class I refrigerants are refrigerants that have an ozone depletion potential (ODP) greater than 0.2, and consist of all chlor...

What do R-11 and R-123 refrigerants have in common? A. They are oxygen depleting B. They are Class I and II substances as defined by the EPA C. Both A and B D. Neither A nor B Correct Answer - C. Both A and B What is the required evacuation level for recovering refrigerant from a low-pressure appliance with a recovery machine manufactured before November 15, 1993? A. 0 psig B. 4" Hg C. 10 A Hg D. 25" Hg Correct Answer - D. 25" Hg How is frost best removed from a sight glass...

the clean air act: Correct Answer - 15 November 1990 the technician certification deadline Correct Answer - 14 november 1994 venting of cfc/hcfc refrigerants law took effect Correct Answer - 1 July 1992 study of the ozone began Correct Answer - the 1920's which of the following is the most destructive to the ozone protective layer? Correct Answer - non-water soluble chlorine which of the following is an agreement that states that the United States will not import cfc type refrige...

The stratosphere is located how many miles above sea level? Correct Answer - Between 7 and 30 miles The ozone molecule consists of how many oxygen atoms? Correct Answer - 3 (O3) The stratosphere is comprised of? Correct Answer - Ozone and other gases What is the purpose of the Ozone layer? Correct Answer - It protects us from ultraviolet radiation and helps maintain stable earth temp Stratospheric ozone depletion is an America issue? T or F Correct Answer - F ( global ) What are s...

Ozone depletion is caused by _ in HCFC refrigerants Correct Answer - Chlorine CFCs and HCFCs _ making them capable of reaching the stratospheric ozone Correct Answer - do not dissolve in water or easily break down in the atmosphere How many ozone molecules are destroyed by one chlorine atom Correct Answer - 100,000 ozone molecules The stratospheric ozone layer protects us from _ Correct Answer - ultraviolet radiation from the sun Which health effect increases from loss of the stratos...

Asphyxia Correct Answer - The displacement of oxygen in a room by the denser refrigerant. Azeotrope Correct Answer - A blend of two or more components whose equilibrium vapor phase and liquid phase composition are the same at a given pressure. These refrigerants are given a 500-series ASHRAE designation and behave like a single refrigerant. They can be charged as a liquid or vapor. Bubble Point Correct Answer - The temperature at which the non-azeotropic blend first begins to evaporate (bo...

The state of the refrigerant entering the metering device is: Correct Answer - High pressure liquid The following components are metering devices: Correct Answer - Evaporator pressure regulator, Thermostatic expansion valve The state of the refrigerant entering the compressor is: Correct Answer - Low pressure vapor Before the recovery process can be initiated, a technician must know: Correct Answer - The type of refrigerant in the system Checking the pressure of a recovery cylinder a...