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Cfc Core Quiz spring sem. 2023- Test #2/ 98 questions and answers.
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Cfc Core Quiz spring sem. 2023- Test #2/ 98 questions and answers.
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Cfc Core Quiz spring sem. 2023-Test #2/ 98 questions and
answers
Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons
(HCFC's) have the following similarity: - -They must be recovered
before opening or disposing of an appliance
-The time it takes to properly evacuate and dehydrate a system
prior to charging with refrigerant is determined by the: - -all of
the above:
Total volume of the system
Amount on non-condensibles (moisture) in the system
Ambient temperature
-Whenever dry nitrogen is used in service and installation
practice, what item is of the most importance for SAFETY
considerations? - -That a relief valve is inserted in the line
downstream from the regulator
-Manufacturers often color code the exterior of service gauges.
On a typical gauge manifold set the high pressure gauge is
colored: - -Red
-Each chlorine atom in the stratosphere can destroy
________ozone molecules: - -100,000
-Which refrigerants have the lowest ozone depletion potential
(ODP)? - -HFCs
-Refrigerant entering the compressor of a refrigeration system is
a: - -superheated vapor
-Which refrigerant is an HCFC? - -R-123 and R-22
, -CFC's will no longer be imported or manufactured in the United
States after: - -1995
-The molecule found in CFC and HCFC refrigerants that destroys
ozone in the stratosphere is: - -Chlorine
-A refrigerant oil that is hygroscopic: - -has a high affinity for
water
-Which of the following leak detection methods does the EPA
consider to be the most effective for locating the general area of
small leaks? - -electronic/ ultrasonic
-All devices used for refrigerant recovery must: - -meet EPA
standards
-When pressurizing a refrigeration system with nitrogen, what
rule should you always follow? - -Charge through a pressure
regulator and relief valve
-After 1995, supplies of CFC refrigerant for equipment servicing
will come from: - -recovery and recycling
-Before you dispose of any appliance containing a CFC or HCFC
refrigerant, you must: - -Recover the refrigerant
-After 1995, supplies of CFC refrigerants will come from - -
recovery and recycling
-Self-contained (active) recovery devices: - -Can capture liquid or
vapor refrigerant without the assistance of the system
compressor or the pressure of the refrigerant in the system
-After using up the refrigerant in a disposable cylinder the
technician: - -Recovers any refrigerant, renders the cylinder
useless, and recycles the metal
-As of what date did it become unlawful to intentionally release
Class I and Class II refrigerants to the atmosphere? - -July 1, 1992
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