NEW QUIZ EPA CORE Questions 81-160

81. What effects can ozone depletion have on the environment? 

• A) reduced crop yields

• B) reduced marine life  

• C) increased ground-level ozone

• D) all of the above 

82. Non-Azeotropic refrigerants leak from a system:  

• A) faster than other refrigerants.  

• B) in uneven amounts due to different vapor pressures.

• C) slower than other refrigerants. 

• D) only if the joint fails completely. 

83. An example of an HCFC refrigerant is:  

• A) R-410A 

• B) R-22  

• C) R-114 

• D) R-717

84. Which chemicals are controlled by the Montreal Protocol?  A) chlorofluorocarbons  

B) hydrochlorofluorocarbons  

C) halons  

D) all of the above 

• A) chlorofluorocarbons

• B) hydrochlorofluorocarbons 

• C) halons  

• D) all of the above 

85.Systems charged with R-134a should be leak checked with:  A) CFCs.  

B) HCFCs.  

C) compressed dry air.  

D) pressurized nitrogen. 

• A) CFCs.  

• B) HCFCs.  

• C) compressed dry air. 

• D) pressurized nitrogen. 

86. When evacuating a system, the hoses should be:  

• A) orange in color for safety reasons. 

• B) as long as possible. 

• C) smaller than vacuum pump inlet connection.  

• D) equal to or larger than vacuum pump inlet connection. 

87. It has been illegal to vent substitutes for CFC and HCFC refrigerants since: 

• A) June 1, 1992.

• B) July 15, 1993.  

• C) November 1993. 

• D) November 1995. 

88. Never use oxygen or compressed air to pressurize a system because:  

• A) when mixed with compressor oil or some refrigerants, it could explode.

• B) leaking oxygen or compressed air are more difficult to detect than nitrogen.  

• C) the pressures produced by either oxygen or compressed air are not as good as nitrogen pressures. 

• D) oxygen and compressed air do not mix with refrigerants. 

89. Refrigerant cylinders should always be:  

• A) free of rust and damage. 

• B) color coded to indicate the contents. 

• C) secure.  

• D) all of the above 

90. Even though R-22 is considered non-toxic, it:  

• A) is lighter than air. 

• B) can cause asphyxia. 

• C) is a Class I refrigerant.

• D) can be detected by its color.