EPA 608 Core

Question 1

To determine the maximum allowable pressure to use when checking a system, check:
A) With the equipment owner
B) with the refrigerant pressure/ temperature tables
C) the design pressure on the equipment nameplate
D) ask the local utility company

Answer 1

C) the design pressure on the equipment nameplate

Question 2

An example of an HFC refrigerant is:
A) R-410A.
B) R-115.
C) R-22.
D) R-11.

Answer 2

A) R-410A

Question 3

\_\_\_\_\_\_\_ refers to the process of cleaning refrigerant by oil separation and single or multiple passes through filter-driers, which reduce moisture and acidity?
A) recycling
B) recovering
C) reclaiming
D) restoring

Answer 3

A) recycling

Question 4

A compound pressure gauge, typically used on the low side of the system, measures pressure in:
A) psia
B) torrs and microns
C) psig and inches of mercury
D) psia and microns

Answer 4

C) msig and inches of mercury

Question 5

A refillable refrigerant cylinder must never be filled to more than \_\_\_\_\_\_ of its capacity by weight:
A) 70%
B) 80%
C) 90%
D) 95%

Answer 5

B) 80%

Question 6

Ozone depletion in the stratosphere is what type of problem?
A) American
B) Third World
C) National
D) Global

Answer 6

D) Global

Question 7

The EPA requires the installation of a service aperture or process stub on all appliances using a class I or class II substance as a refrigerant. The main purpose of this requirement is to make it easier to:
A) recover refrigerant.
B) change the compressor lubrication.
C) vent non-condensables.
D) dehydrate the system

Answer 7

A) recover refrigerant

Question 8

Reusable refrigerant containers that are normally under any pressure above psig, must be hydrostatically tested and date stamped every:
A) 1 year
B) 2 years
C) 3 years
D) 5 years

Answer 8

D) 5 years

Question 9

What is one of the most serious results of damage to the ozone layer?
A) mutation of marine plants
B) increased volcanic activity
C) increases in human skin cancer
D) higher natural background radioactivity

Answer 9

C) increases in human skin cancer

Question 10

Of the refrigerants listed below, which types of refrigerants will not damage stratospheric ozone?
A) CFC's
B) HCFC's
C) HFC's
D) They all damage the ozone

Answer 10

C) HFC’s

Question 11

Of the refrigerants listed below, which refrigerant type have the highest ozone depletion potential?
A) HCFC's
B) HFC's
C) CFC's
D) All are equal

Answer 11

C) CFC’s

Question 12

Ester based oils can be mixed with:
A) no other oils
B) paraffinic mineral oils only.
C) alkylbenzene oils only.
D) mineral oils.

Answer 12

A) No other oils.

Question 13

Under EPA's regulations, what standard must reclaimed refrigerant meet before it can be resold?
A) ARI 700
B) ARI 740
C) EPA 700
D) UL 740

Answer 13

A) ARI 700

Question 14

A cylinder with a gray body and a yellow top indicates that the cylinder is designed to hold:
A) Nitrogen
B) inert gas
C) only R-12
D) recovered refrigerant

Answer 14

D) Recovered refrigerant

Question 15

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

Answer 15

D) All of the above

Question 16

Manifold gauge sets are often color coded, when this is done, the high pressure gauge is color coded:
A) red.
B) white.
C) blue.
D) yellow.

Answer 16

A) red.

Question 17

Chlorofluorocarbons (CFCs) and hydrofluorocarbons (HCFCs) have which of the following in common?
A) They have identical ODP’s.
B) They both contain hydrogen.
C) They have the same normal boiling points.
D) They must be recovered before opening or disposing of appliances.

Answer 17

D) They must be recovered before opening or disposing of appliances.

Question 18

Refrigerant that enters the compressor, under normal operating conditions, is a:
A) low pressure vapor.
B) low pressure liquid.
C) high pressure liquid.
D) high pressure vapor.

Answer 18

A) low pressure vapor.

Question 19

What characteristic(s) of CFCs make them more likely to reach the stratosphere than most other compounds containing chlorine?
A) Refrigerants that contain chlorine but not hydrogen are so stable that they do not break down in the lower atmosphere after being released. The chlorine of bromine reacts with ozone, causing it to change back to oxygen, thus destroying the ozone layer.
B) CFCs are lighter than other damaging compounds, making it easier for them to float upward when released.
C) CFCs are attracted to the static in the atmosphere
D) CFCs are attracted to dust in the atmosphere

Answer 19

A) Refrigerants that contain chlorine but not hydrogen are so stable that they do not break down in the lower atmosphere after being released. The chlorine of bromine reacts with ozone, causing it to change back to oxygen, thus destroying the ozone layer.

Question 20

When transporting cylinders containing used refrigerant, the DOT requires that you:
A) use OSHA-approved containers. 
B) attach DOT classification tags.
C) ship by EPA certified carrier
D) do all of the above.

Answer 20

B) attach DOT classification tags.

Question 21

R-410 is not a typical blended refrigerant because:
A) It is a near azeotropic refrigerant
B) It can be charged as either a liquid or vapor.
C) While it has a 400 series refrigerant number it behaves like a 500 series refrigerant.
D) All of the above

Answer 21

D) All of the above