EPA 608 Practices Test UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Which of the refrigerant is used in low pressure refrigerated appliance: - CORRECT
ANSWER R-123
True or False:
Ozone is a unstable molecule: - CORRECT ANSWER True
True or False:
Recovered refrigerant can be returned to the same system or other systems owned by the same
person without restriction: - CORRECT ANSWER True
The diameter of the liquid line must be as ______ as possible to minimize the total refrigerant
charge: - CORRECT ANSWER Small
If the label identifying the refrigerant is missing, then which of the following method is used to
identify the type of refrigerant: - CORRECT ANSWER Pressure-Temperature method
Nitrogen react with hydrogen to form which of the following - CORRECT
ANSWER Ammonia
Which of the following is used to minimize the leakage of refrigerant while checking: -
CORRECT ANSWER Self-sealing hoses &
Hand valves
Which type of leak detector works by drawing the vapor into the system and heating it: -
CORRECT ANSWER Electronic leak detector
,Two refrigerants are not allowed to collect into one recovery cylinder because: - CORRECT
ANSWER Recovery back of two refrigerants from mixture is not possible
If the vacuum pump used is too large, water removal will become: - CORRECT
ANSWER Difficult
As the pressure drops water cools down and freeze makes difficult to extract
CFC-11 and CFC-12 Ozone depleting substances constitutes of ______ of stratospheric chlorine
- CORRECT ANSWER 51%
Flushing agents shall not be introduced into which of the following in a refrigeration system: -
CORRECT ANSWER Compressor
Flushing agent will removes lubrication oil of compressor
A Type I technician primarily works on - CORRECT ANSWER small appliances such as
domestic
refrigerators, window air conditioners, PTACs and vending machines
A Type II technician primarily works on - CORRECT ANSWER equipment using a high
pressure refrigerant such as HCFC-22.
A Type II technician primarily works on equipment - CORRECT ANSWER equipment
includes residential air conditioners and heat pumps, supermarket refrigeration and process
refrigeration.
A Type III technician primarily works on equipment - CORRECT ANSWER using a low
pressure
refrigerant such as HCFC-123 or CFC-11.
,HCFC-123 or CFC-11 refrigerants systems are (low/high) pressure? - CORRECT
ANSWER Low pressure
What kind of refrigerants systems are chillers? - CORRECT ANSWER Low pressure
Any candidate passing all three of these EPA types - CORRECT ANSWER is certified as
Universal.
Naturally occurring gas molecule that is made up of three oxygen atoms (O3). - CORRECT
ANSWER Ozone
At ground level, ozone is considered "(bad/good)" and is a pollutant that causes significant
health risks as well as damaging vegetation - CORRECT ANSWER Bad
The ozone that occurs in the upper atmosphere or stratosphere is considered "good" ozone. This
"good" ozone in the stratosphere is a layer that extends about ___________ miles above earth
and
creates a protective shield for Earth from the sun's harmful ultraviolet (UV) rays. - CORRECT
ANSWER 6 to 30 miles above earth
Depletion of
ozone allows more of the sun's harmful UV rays to reach the earth resulting in the following
problems: - CORRECT ANSWER Increased temperature of the earth
Increased cases of skin cancer
Increased numbers of cataracts in the eyes
Increased ground level ozone
Crop and vegetation loss
Reduced marine life
, Ozone can be destroyed by________ and _______ atoms emitted into the atmosphere. -
CORRECT ANSWER chlorine and bromine
When a chlorine atom meets with an ozone molecule, it ______an oxygen atom from the ozone
molecule. - CORRECT ANSWER takes
The ozone molecule (O3) changes to an oxygen molecule (O2), while the chlorine atom changes
to a compound called ________. - CORRECT ANSWER chlorine monoxide (ClO).
When __________ meets ozone, it
releases its oxygen atom and forms two O2 oxygen molecules, leaving the chlorine molecule free
to attack another ozone molecule and repeat the process. - CORRECT ANSWER chlorine
monoxide
It is estimated that a single chlorine
atom can destroy ________ ozone molecules. - CORRECT ANSWER 100,000
These gases come primarily from ______ and _______, which were once used in almost every
refrigeration and air conditioning unit manufactured - CORRECT ANSWER CFCs
(chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons)
CFC is an organic compound containing - CORRECT ANSWER carbon, chlorine, and
fluorine
CFCs is (lighter/heavier) than air - CORRECT ANSWER heavier
True or False:
CFCs will not dissolve in water or break down into compounds that
dissolve in water - CORRECT ANSWER True
ACTUAL Exam Questions and CORRECT
Answers
Which of the refrigerant is used in low pressure refrigerated appliance: - CORRECT
ANSWER R-123
True or False:
Ozone is a unstable molecule: - CORRECT ANSWER True
True or False:
Recovered refrigerant can be returned to the same system or other systems owned by the same
person without restriction: - CORRECT ANSWER True
The diameter of the liquid line must be as ______ as possible to minimize the total refrigerant
charge: - CORRECT ANSWER Small
If the label identifying the refrigerant is missing, then which of the following method is used to
identify the type of refrigerant: - CORRECT ANSWER Pressure-Temperature method
Nitrogen react with hydrogen to form which of the following - CORRECT
ANSWER Ammonia
Which of the following is used to minimize the leakage of refrigerant while checking: -
CORRECT ANSWER Self-sealing hoses &
Hand valves
Which type of leak detector works by drawing the vapor into the system and heating it: -
CORRECT ANSWER Electronic leak detector
,Two refrigerants are not allowed to collect into one recovery cylinder because: - CORRECT
ANSWER Recovery back of two refrigerants from mixture is not possible
If the vacuum pump used is too large, water removal will become: - CORRECT
ANSWER Difficult
As the pressure drops water cools down and freeze makes difficult to extract
CFC-11 and CFC-12 Ozone depleting substances constitutes of ______ of stratospheric chlorine
- CORRECT ANSWER 51%
Flushing agents shall not be introduced into which of the following in a refrigeration system: -
CORRECT ANSWER Compressor
Flushing agent will removes lubrication oil of compressor
A Type I technician primarily works on - CORRECT ANSWER small appliances such as
domestic
refrigerators, window air conditioners, PTACs and vending machines
A Type II technician primarily works on - CORRECT ANSWER equipment using a high
pressure refrigerant such as HCFC-22.
A Type II technician primarily works on equipment - CORRECT ANSWER equipment
includes residential air conditioners and heat pumps, supermarket refrigeration and process
refrigeration.
A Type III technician primarily works on equipment - CORRECT ANSWER using a low
pressure
refrigerant such as HCFC-123 or CFC-11.
,HCFC-123 or CFC-11 refrigerants systems are (low/high) pressure? - CORRECT
ANSWER Low pressure
What kind of refrigerants systems are chillers? - CORRECT ANSWER Low pressure
Any candidate passing all three of these EPA types - CORRECT ANSWER is certified as
Universal.
Naturally occurring gas molecule that is made up of three oxygen atoms (O3). - CORRECT
ANSWER Ozone
At ground level, ozone is considered "(bad/good)" and is a pollutant that causes significant
health risks as well as damaging vegetation - CORRECT ANSWER Bad
The ozone that occurs in the upper atmosphere or stratosphere is considered "good" ozone. This
"good" ozone in the stratosphere is a layer that extends about ___________ miles above earth
and
creates a protective shield for Earth from the sun's harmful ultraviolet (UV) rays. - CORRECT
ANSWER 6 to 30 miles above earth
Depletion of
ozone allows more of the sun's harmful UV rays to reach the earth resulting in the following
problems: - CORRECT ANSWER Increased temperature of the earth
Increased cases of skin cancer
Increased numbers of cataracts in the eyes
Increased ground level ozone
Crop and vegetation loss
Reduced marine life
, Ozone can be destroyed by________ and _______ atoms emitted into the atmosphere. -
CORRECT ANSWER chlorine and bromine
When a chlorine atom meets with an ozone molecule, it ______an oxygen atom from the ozone
molecule. - CORRECT ANSWER takes
The ozone molecule (O3) changes to an oxygen molecule (O2), while the chlorine atom changes
to a compound called ________. - CORRECT ANSWER chlorine monoxide (ClO).
When __________ meets ozone, it
releases its oxygen atom and forms two O2 oxygen molecules, leaving the chlorine molecule free
to attack another ozone molecule and repeat the process. - CORRECT ANSWER chlorine
monoxide
It is estimated that a single chlorine
atom can destroy ________ ozone molecules. - CORRECT ANSWER 100,000
These gases come primarily from ______ and _______, which were once used in almost every
refrigeration and air conditioning unit manufactured - CORRECT ANSWER CFCs
(chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons)
CFC is an organic compound containing - CORRECT ANSWER carbon, chlorine, and
fluorine
CFCs is (lighter/heavier) than air - CORRECT ANSWER heavier
True or False:
CFCs will not dissolve in water or break down into compounds that
dissolve in water - CORRECT ANSWER True
