What does ozone in the stratosphere above the earth consist of? - Answer- Molecules containing 3 oxygen atoms
Which of the following refrigerants has the lowest global warming potential? - Answer- R-600a
Which of t
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What does ozone in the stratosphere above the earth consist of? - Answer- Molecules containing 3 oxygen atoms
Which of the following refrigerants has the lowest global warming potential? - Answer- R-600a
Which of the following gases is used as the baseline measurement for global warming potential? - Answer- Carbon Dioxide
Which type of refrigerant typically has the lowest global warming potential? - Answer- HFO's
What is the state of the refrigerant entering the compressor of a refrigeration system? - Answer- Low Pressure Vapor
Why are HFO refrigerants less flammable than hydrocarbon refrigerants? - Answer- They contain Flourine
What does a section 608 certification allow a technician to do? - Answer- Purchase or handle controlled refrigerants
Which type of refrigerant has the highest ozone depletion potential? - Answer- CFC's
Which of the following refrigerants contain chlorine? - Answer- R-22
HFC refrigerants contain which of the following? - Answer- Hydrogen, Fluorine, Carbon
What is being done in the US to stop damage to the stratosphere ozone layer? - Answer- Phasing out the use of CFC And HCFC
How should disposable cylinders of refrigerants be discarded? - Answer- Recover all remaining refrigerant, render the cylinders useless, and recycle the metal.
In addition to fines and being required to appear in court, what penalty can be imposed on techs who violate clean air act provisions? - Answer- They may lose their certifications
For an appliance that uses a CFC, HCFC, or HFC refrigerant, which of the following violates the prohibition of venting? - Answer- Refrigerants emitted when cutting a line without properly evacuation an appliance.
Which word applies to the process that returns refrigerant to new production specifications that requires chemical analysis? - Answer- Reclaim
What synthetic lubricant is presently used with ternary blends containing HCFC's? - Answer- Alkylbenzene
What units does a compound pressure gauge for the low side of the system measure pressure in? - Answer- PSIG and inches of mercury
How should refrigerant blends be charged? - Answer- As a liquid
Which process applies to cleaning refrigerants for immediate reuse by oil separation and single or multiple passes through device, like replaceable core filter driers which reduce moisture and acidity? - Answer- Recycling
Which of the following leak detection methods is considered to be the most effective for locating the general area of a small leak? - Answer- Electronic or ultrasonic tester
What should a technician do if they discover that some R-410a was added to an r-22 system? - Answer- Recover the mixture in a separate recovery tank
Which factor does not affect the speed of evacuation? - Answer- The brand of micron gauge used
Which of the following is not a recommended safety practice when operating refrigerant recover or recycling equipment? - Answer- Remain at least 5 feet away from any operating equipment
Refrigerant cylinders should be all of the following except? - Answer- Filled to 95% capacity
When transporting cylinders containing used refrigerant, DOT requires that you: - Answer- Attach DOT classification tags
All appliances must be equipped with a service aperture or other device which is used when adding or removing refrigerant from the appliance. What is typically used on small appliances? - Answer- A straight piece of tubing that is entered using a piercing access valve.
What type of appliances are technicians certified to change and open after passing type 1 examination? - Answer- Appliances containing 5 lbs. or less of refrigerant that have been hermetically sealed and charged at the factory.
What type of certification is required for persons recovering CFC's, HCFC's, or HFC's during maintenance, service, or repair of small appliances? - Answer- Type 1 or universal
EPA section 608 rules require capture of 80% of the HCFC's and HFC's from a small appliance sealed system with a non operating compressor if techs are using: - Answer- self contained (active) system
Which of the following does not meet the criteria for type 1 appliance certification? - Answer- An MVAC-like system that holds three pounds of r-12
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