HVAC (EPA Certification Exam Section 608) Questions and Answers

Document Content and Description Below

How many types of HVAC certifications are there? - Answer- There are 4 types. What does a metering device do? - Answer- The metering device causes a reduction in pressure, and therefore a reduction... in saturation temperature. What is absorbed in the evaporator? - Answer- Heat is absorbed in the evaporator. What happens in the evaporator? - Answer- Heat is absorbed in the evaporator and causes the refrigerant to boil from liquid to vapor. At the outlet of the evaporator the refrigerant is what? - Answer- The refrigerant is now a low temperature, low pressure vapor. As the refrigerant expels heat, the refrigerant condenses to a what? - Answer- It condenses to a liquid. At the condenser outlet what pressure is the refrigerant? - Answer- The refrigerant is a high pressure liquid. What is a metering device used for? - Answer- The metering device causes a reduction in pressure, and therefore a reduction in saturation temperature. A system that uses a capillary tube or fixed bore metering device is usually equipped with a blank? - Answer- Accumulator which would be located in the suction line directly following the evaporator. A system that uses a thermostatic expansion valve is usually equipped with a what? - Answer- A receiver, which would be located in the liquid line directly following the condenser. The compound gauge is what color? - Answer- Blue. The high pressure gauge is what color? - Answer- Red. The blank measures low pressure (psig) and vacuum (inches Hg.). - Answer- Compound gauge. What does the high pressure gauge measure. - Answer- It measures high side (discharge) pressure. EPA regulations require that hoses be equipped with what? - Answer- Low loss fittings that will minimize refrigerant loss when hoses are disconnected. The stratosphere is located where? - Answer- Between 10 and 30 miles above sea level. What is the stratosphere comprised of? - Answer- Ozone. An Ozone molecule consists of what? - Answer- Three oxygen atoms (03). What does Ozone protect us from? - Answer- Harmful ultraviolet radiation. What does Ozone help maintain? - Answer- It helps maintain stable Earth temperatures. Depletion of Ozone in the stratosphere causes what? - Answer- Crop loss, Increase in eye diseases, Skin cancer, Reduced marine life, Deforestation , Increased ground level ozone. What depletes the ozone layer? - Answer- CFC's and HCFC's. When a chlorine atom meets with an Ozone molecule, it takes how many Oxygen atoms from the Ozone? - Answer- One. When a chlorine atom meets with an Ozone molecule, it takes one Oxygen atom from the Ozone. What compound does this form? - Answer- Chlorine Monoxide (CIO). O2 A single Chlorine atom can destroy how many Ozone molecules? - Answer- 100,000 Ozone molecules. Volcanoes contribute a blank quantity of Chlorine as compared to CFC's? - Answer- A small quantity. Will the chlorine in CFC's dissolve in water? - Answer- No. What is Ozone Depletion Potential (ODP)? - Answer- A measurement of CFC's and HCFC's ability to destroy ozone. What has the highest ODP? - Answer- CFC's. What do not contain chlorine and have no Ozone Depletion Potential? - Answer- HFC's (R-134A). What does CFC stand for? - Answer- Chlorine Fluorine Carbon. What does HCFC stand for? - Answer- Hydrogen Chlorine Fluorine Carbon. What does HFC stand for? - Answer- Hydrogen Fluorine Carbon. What is R-134a? - Answer- Hydrogen Fluorine Carbon (HFC). What is R-22 and R-123? - Answer- Hydrogen Chlorine Fluorine Carbon (HCFC). What is R-11, R-12, and R-500? - Answer- Chlorine Fluorine Carbon (CFC). Who regulates section 608 of the Federal Clean Air Act? - Answer- The Environmental Protection Agency (EPA). Failure to comply with section 608 of the Federal Clean Air Act could cost what? - Answer- Failure to comply could cost you and your company as much as $27,500. per day, per violation and there is a bounty of up to $10,000. It is a violation of Section 608 to vent CFC's or HCFC's since what date? - Answer- July 1, 1992. It is a violation of Section 608 to vent HFC's since what date? - Answer- November 15, 1995. Is it a violation of Section 608 to not have an EPA approved recovery device, equipped with low loss fittings, and register the device with the EPA? - Answer- Yes, it is a violation. What is responsible for regulating the production and use of CFCs, HCFC's, halons, methyl chloroform and carbon tetrachloride? - Answer- The Montreal Protocol. When did the Montreal Protocol come into affect? - Answer- Mid 1989. CFC's were phased out of production on what date? - Answer- December 31, 1995. After virgin supplies of CFC's are depleted where will future supplies will come from? - Answer- From recovered, recycled, or reclaimed refrigerants. Are HCFC refrigerants scheduled to phase out? - Answer- Yes, in the future. What are the three R's? - Answer- Recover, Recycle, and Reclaim. What is the meaning of Recover? - Answer- To remove refrigerant in any condition from a system and store it in an external container. What is the meaning of Recycle? - Answer- To clean refrigerant for rouse by separating the oil from the refrigerant and removing moisture from the refrigerant by passing it through one or more filter driers. What is the meaning of Reclaim? - Answer- To process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis. What refrigerant must meet the standard set forth in ARI 700 before it can be resold? - Answer- Reclaimed refrigerant. Refrigerant Recovery and/or Recycling equipment manufactured after what date, must be certified and labeled by an EPA approved equipment testing organization to meet EPA standards. - Answer- After November 15, 1993. How many basic types of recovery devices are there? - Answer- Two basic types. What are the two types of recovery devices? - Answer- System-dependent and Self-contained. What type of recovery device needs assistance of components to recover refrigerant? - Answer- System-dependent recovery devices. As of when did the sale of CFC and HCFC refrigerants become restricted to certified technicians? - Answer- November 14, 1994. Only technicians certified under Clean Air Act Section 609 - Motor Vehicle Air Conditioning - are allowed to purchase refrigerants in containers smaller than how many pounds? - Answer- 20 pounds. What refrigerant is an HFC and is considered Ozone friendly? - Answer- R-134A. The oils used in most R-134A refrigeration systems are what kind? - Answer- Esters. Can esters be mixed with other oils? - Answer- Esters cannot be mixed with other oils. when leak testing an R-134A system what do you want to use? - Answer- Pressurized nitrogen. Ternary blend refrigerant means they are a blank blend? - Answer- Three-part blend. What are used with a synthetic alkyl benzene lubricant? - Answer- Ternary blends. Most refrigerant oils are what? - Answer- Hygroscopic oil. What oil has a high affinity for water? - Answer- Hygroscopic. The components of a blended refrigerant will leak from a system at uneven rates due to what? - Answer- Due to different vapor pressures. [Show More]

Last updated: 10 months ago

Preview 1 out of 12 pages