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here. #1. Each chlorine atom can destroy up to ____ Ozone molecules
100,000 #2. Which of the following refrigerants do NOT contain chlorine
HCFC #3. Which of the following is a CFC?
R-134 #4. Which of the following is a HCFC?
R-134 #5. Which of the following is a HFC?
R-134 #6. If you were to arrange the refrigerants in the decreasing order of Ozone Depletion Potential (ODP), it would look like:
CFC > HCFC > HFC
HCFC > HFC > CFC
HCFC > CFC > HFC
CFC > HFC > HCFC #7. What is the effect of depleting ozone in stratosphere?
It causes skin cancer
It causes a deep skin burn
It affects the Vitamin D in the body #8. The evidence of stratospheric ozone depletion ____
has as no connection to CFC or HCFC
strongly suggests the role of CFCs
is directly related to the chlorine present in volcanic ash #9. CFCs were banned from being produced or imported into the US after:
Feb 14th, 1987
Dec 25th, 1998
Dec 31st, 1995 #10. Recovery equipment must be certified by the EPA if it is manufactured after what date:
November 1993 #11. As per the clean air act of 1992, Venting of refrigerants is prohibited during:
Both servicing and disposal #12. A person supplying information about a technician intentionally violating the clean air act and venting refrigerants can be awarded up to:
$5,000 #13. For violating the clean air act of 1992, a technician can be fined up to:
$10,000 #14. The substitutes for refrigerants are NOT subject to clean air act and are therefore allowed to be vented:
False #15. R-12 refrigerant can be substituted in a “drop-in” fashion with which of the following refrigerant?
There is no valid “drop-in” substitute for R-12
R-22 #16. International treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion is
Paris Agreement #17. The compounds controlled by Montreal Protocol include
All of the above
Only A and B #18. In a manifold gauge, the high pressure link is colored
Rainbow #19. Yellow line in a manifold gauge can be connected to
Low Pressure Line
High Pressure Line #20. A recovery device which uses the components of the system it is recovering from is called
Atmosphere Dependent System
System Dependent System
Self Contained System #21. Which of the following is not a valid way to recover refrigerant from a unit using a system dependent equipment?
Compressor of the unit
High pressure of the refrigerant
Inbuilt compressor within the system
Independant portable compressor #22. It is important to never mix refrigerants because
The mixture may explore
The resultant mixture is dangerous to transport
It is impossible to recover the resultant mixture #23. The color coding of recovery cylinders is
Gray top and yellow body
Yellow top and gray body
Gray body and yellow polka dots #24. Recovery equipment manufactured after Nov 1993 must be certified by a(n)
EPA approved third party
Manufacturer of the equipment
EPA certified technician #25. Before reselling a reclaimed refrigerant, it must
Be visibly clear
Meet the ARI-700 standard
Be converted to a hygroscopic state #26. HFC, like R-134a, works best with which type of lubricant?
Water based lubricant
Alkylbenzenes #27. The tendency of different components of refrigerant blends like freon and a lubricant leaking at different rates, causing the overall mixture composition to change is called
Fractionation #28. Refrigerant blends leak at different rates due to
Size of the leaks being different at different places
Difference in vapor pressures among several refrigerants
Changes in temperature between compressor and condenser #29. In the refrigeration cycle, high pressure vapor is converted to high pressure liquid in
Evaporator #30. In the refrigeration cycle cooling occurs when
Refrigerant liquid boils into vapor
High pressure vapor is compressed to liquid
Low pressure vapor is converted to high pressure vapor #31. _____ is when a refrigerant is removed and stored without testing or cleaning.
Reclaim #32. _____ is when a refrigerant is removed and cleaned for reuse by separating oil and refrigerant
Reclaim #33. To consider a refrigerant reclaimed, it has to meet
Clean air act restrictions
ARI 700 standard
Montreal protocol guidelines #34. R-22 mixes well with which of the following refrigerant?
It doesn’t mix and it’s important not to mix it with other refrigerants #35. The speed of the recovery depends on
Size of the equipment
Length of the hose
Diameter of the hose
All of the above #36. How does temperature effect refrigerant recovery process?
Temperature has no effect on recovery
Lower temperature is better for recovery
Higher temperature is better for recovery #37. For the best recovery, the piping connection to the vacuum pump should be
short in length and large in diameter
short in length and short in diameter
long in length but short in diameter #38. During system evacuation, it is recommended that the system vacuum gauge should be located:
As close to the vacuum pump as possible
At exactly 25mm away
As far from vacuum pump as possible #39. Which is the most preferred gas to use to check leaks?
Oxygen #40. Why is it not advised to use oxygen or compressed air to leak check?
They are very expensive gases compared to Nitrogen
They are freely available so it hurts the economy to use these gases
They are not safe as they can lead to explosion with some refrigerants #41. When working with non-toxic refrigerants,
Safety is not a concern, hence safety equipment can be avoided
All safety equipment including gloves and goggles must be worn
Safety can be ensured by exercising more caution #42. The EPA 608 test is primarily focused
Protecting the environment only
Protecting both the environment and technician
Protecting the technician only #43. Exposure to refrigerants is
Safe #44. To service an area which has a large spill of refrigerants, it is necessary to use
Self contained breathing apparatus
Bare hands and eyes
Goggles and Gloves #45. Which of the following is the most important safety precaution when using dry nitrogen from a portable cylinder to pressurize a system?
Use of a pressure regulator and relief valve upstream of the regulator
Use of a pressure regulator and relief valve downstream of the regulator
Mandatory use of a relief value and optional use of a pressure regulator #46. A refillable cylinder must never exceed ____ of its capacity by weight?
80% #47. Any cylinder filled with refrigerant and used for transportation must be
Registered with DMV
All of the above #48. Refillable cylinders must be tested and date stamped every __ years.
Seven #49. Before shipping, the cylinder’s labels must contain
At least 80% of refrigerant
DOT classification tag and refrigerant identification
Flammability rating of the refrigerant stored inside #50. Refrigerant cylinders should be stored
In sleeping position
Inverted with yellow paint facing down on special palettes
In upright position and properly secured.