EPA 608 Core Practice Test

Our EPA 608 Core Practice Test will help you improve your performance on a test that will provide you with a certification.

We present to you 20 questions created and managed by professionals that cover subject areas such as refrigeration, ozone depletion, recovery techniques, safety, shipping, dehydration evacuation, and other relevant fields.

Each question contains an explanation that will support your process of learning and revision.

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Question 1

Under what section are Motor Vehicle Air Conditioning technicians governed?

A	609
B	507
C	608
D	607

Question 1 Explanation:

Motor Vehicle Air Conditioning (MVAC) service technicians are governed under EPA 609 section.

Question 2

Please mark what is used for minimizing of the leakage of refrigerant while checking the pressure of the system:

A	Self-sealing hoses
B	Hand valves
C	Either of the above

Question 2 Explanation:

Self-sealing hoses, as well as hand valves, are used for minimizing of the leakage of refrigerant while checking the pressure of the system.

Question 3

Please mark the refrigerant group to which R-134a belongs to:

A	HCFC
B	HFC
C	CFC

Question 3 Explanation:

HFC is the refrigerant group to which R-134a belongs to.

Question 4

Please mark the leak detector that functions by drawing and heating the vapor into the system:

A	Helium leak detector
B	Electronic leak detector
C	Ultrasonic leak tester
D	Fluorescent leak detector

Question 4 Explanation:

The electronic leak detector works by drawing the vapor into the system and heating it.

Question 5

Why are two refrigerants not allowed to collect into a single recovery cylinder?

A	Because a recovery back of two refrigerants from the mixture is impossible
B	Because refrigerant mixture can react to each other and explode
C	Both of the above listed

Question 5 Explanation:

Two refrigerants are not allowed to collect into a single recovery cylinder because a recovery back of two refrigerants from the mixture is impossible.

Question 6

Where should the suction line filter drier be located?

A	Just upstream of the condenser inlet.
B	Just upstream of the evaporator inlet.
C	Just upstream of the compressor inlet.
D	Just upstream of the expansion valve inlet.

Question 6 Explanation:

The suction line filter-drier should be placed under the compressor suction in order to prevent any acid in the system from returning back.

Question 7

Please mark the method that is used to identify the type of refrigerant when the label that identifies the refrigerant is missing:

A	Density - Volume method
B	Pressure–Temperature method
C	Density–Temperature method
D	All of the above

Question 7 Explanation:

The pressure–temperature method is used to identify the type of refrigerant when the label that identifies the refrigerant is missing.

Question 8

Can a recovered, clean refrigerant be returned to the same system or other systems owned by the same person without restrictions?

A	Yes
B	No

Question 8 Explanation:

A recovered, clean refrigerant can be returned to the same system or other systems owned by the same person without restrictions.

Question 9

What is the color of the pressure port of the manifold pressure gauge that is connected to the low-pressure side of the system?

A	Green
B	Yellow
C	Blue
D	Red

Question 9 Explanation:

The color of the pressure port of the manifold pressure gauge that is connected to the low-pressure side of the system is blue.

Question 10

Is ozone an unstable molecule at the stratosphere?

A	Yes
B	No

Question 10 Explanation:

Ozone at the stratosphere is an unstable molecule whose instability allows the oxygen atoms to react with hydrogen, nitrogen, chlorine, and bromine.

Question 11

What forms when hydrogen reacts with nitrogen?

A	Nitrogen Hydride
B	Ammonia
C	Nitrogen Hydroxide
D	Hydrogen does not react with nitrogen.

Question 11 Explanation:

When hydrogen reacts with nitrogen ammonia is being formed.

Question 12

What may happen to refrigeration technicians who violate the Clean Air Act?

A	They may lose their EPA certification.
B	They may get fined.
C	They may require to appear in federal court.
D	All of the above,

Question 12 Explanation:

Refrigeration technicians who violate the Clean Air Act may receive a fine, lose their certification and be required to appeal in federal court.

Question 13

What will happen to water removal from the system if the vacuum pump that is used is too big?

A	Water removal will stay the same.
B	Water removal will become easier.
C	Water removal will become more difficult.

Question 13 Explanation:

Water removal will become more difficult if the vacuum pump that is used is too big.

Question 14

Please mark the element that will reduce the stability of the ozone depletion organic refrigerant compounds:

A	Bromine
B	Hydrogen
C	Chlorine
D	All of the above

Question 14 Explanation:

Hydrogen reduces the stability of the ozone and results in decomposition at a lower temperature.

Question 15

What size of diameter should the liquid line have to minimize the total refrigerant pressure drop over the length of the liquid line and what size to avoid refrigerant flash?

A	It must be as small as possible to minimize the total refrigerant pressure drop over the length of the liquid line and as small as possible to avoid refrigerant flash.
B	It must be as large as possible to minimize the total refrigerant pressure drop over the length of the liquid line and as small as possible to avoid refrigerant flash.
C	It must be as small as possible to minimize the total refrigerant pressure drop over the length of the liquid line and as large as possible to avoid refrigerant flash.
D	It must be as large as possible to minimize the total refrigerant pressure drop over the length of the liquid line and as large as possible to avoid refrigerant flash.

Question 15 Explanation:

The Diameter of the liquid line must be as large as possible to minimize the total refrigerant pressure drop over the length of the liquid line and as small as possible to avoid refrigerant flash.

Question 16

What breaks the CFC molecules at the stratosphere releasing chlorine ion?

A	Gamma radiation
B	X-radiation
C	Ultraviolet radiation
D	Infrared radiation

Question 16 Explanation:

Ultraviolet radiation breaks down the CFCs and frees the chlorine ion at the stratosphere,

Question 17

What connects the condenser to the expansion device?

A	The suction line
B	The expansion line
C	The discharge line
D	The liquid line

Question 17 Explanation:

The liquid line connects the condenser to the expansion device.

Question 18

What is the date of manufacture that determines recovery and recycling equipment intended for use to meet the requirements of ARI 740?

A	Nov 15, 1993
B	Jan 1, 1995
C	Dec 31, 1995
D	Dec 31, 1994

Question 18 Explanation:

Nov 15, 1993, is the date of manufacture that determines recovery and recycling equipment intended for use to meet the requirements of ARI 740.

Question 19

Please mark the refrigerant that is used in the low-pressure refrigerated appliance:

A	R-114
B	R-12
C	R-123
D	R-500

Question 19 Explanation:

R-123 is the refrigerant that is used in the low-pressure refrigerated appliance.

Question 20

Does a vacuum test allow air and moisture to enter the system if there is a leak?

A	Yes
B	No

Question 20 Explanation:

Vacuum test allows air and moisture to enter the system if there is a leak and this is quite unpleasant for leak detection systems.

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EPA 608 Core Practice Test

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