EPA 608 Type III Sample Test
Questions
What problem can using large vacuum pumps lead to and how can a technician
prevent it?
a. Power system overload
b. Can cause trapped water to freeze. During evacuation of systems
with large amounts of water, it may be necessary to increase
pressure by introducing nitrogen to counteract freezing
c. Collapse the tubing
d. Damage gaskets - ------------ANS: b. Can cause trapped water to freeze. During
evacuation of systems
with large amounts of water, it may be necessary to increase
pressure by introducing nitrogen to counteract freezing
After removal of liquid, about how much vapor will remain in the system on a 350
ton R-11 chiller?
a. 10 lbs of vapor after all the liquid has been removed
b. 20 lbs of vapor after all the liquid has been removed100 lbs of vapor after
all the liquid has been removed
c. 50 lbs of vapor after all the liquid has been removed
d. 100 lbs of vapor after all the liquid has been removed - ------------ANS: d. 100 lbs
of vapor after all the liquid has been removed
At what point in the system should you charge a low pressure system and what
should you start the charge with?
,a. Charge through the evaporator charging valve as this is the lowest
point on a low pressure system. First charge the system with vapor
b. Charge through the evaporator charging valve as this is the lowest point
on a low pressure system. First charge the system with liquid
c. Charge through the condenser charging valve as this is the lowest point
on a low pressure system. First charge the system with liquid
d. Charge through the purge charging valve as this is the lowest point on a
low - ------------ANS: a. Charge through the evaporator charging valve as this is the
lowest
point on a low pressure system. First charge the system with vapor
At what point in the system should you charge a low pressure system and what
should you start the charge with?
a. Charge through the evaporator charging valve as this is the lowest point on a low
pressure system. First charge the system with vapor
b. Charge through the evaporator charging valve as this is the lowest point on a low
pressure system. First charge the system with liquid
c. Charge through the condenser charging valve as this is the lowest point on a low
pressure system. First charge the system with liquid
d. Charge through the purge charging valve as this is the lowest point on a low
pressure system. First charge the system with vapor - ------------ANS: a. Charge
through the evaporator charging valve as this is the lowest
point on a low pressure system. First charge the system with vapor
Does refrigerant go out of the system in low pressure systems or does air and
moisture go in?
a. Refrigerant escapes through low pressure leaks.
b. Air and moisture enter the refrigeration system because it operates
, in a vacuum
c. Refrigerant leaks out through shaft seals and gaskets. - ------------ANS: b. Air and
moisture enter the refrigeration system because it operates
in a vacuum
How can a technician determine when it is safe to start charging with liquid
refrigerant?
a. Temperature of the water is 36F
b. Temperature of the water is above 32F
c. Temperature of the water is above 40F
d. Refrigerant saturation temperature reaches 36º F or the vapor
pressure reaches 16.9" Hg vacuum - ------------ANS: d. Refrigerant saturation
temperature reaches 36º F or the vapor
pressure reaches 16.9" Hg vacuum
How can a technician determine when it is safe to start charging with liquid
refrigerant?
a. Temperature of the water is 36F
b. Temperature of the water is above 32F
c. Temperature of the water is above 40F
d. Refrigerant saturation temperature reaches 36º F or the vapor pressure reaches
16.9" Hg vacuum. - ------------ANS: d. Refrigerant saturation temperature reaches
36º F or the vapor pressure reaches 16.9" Hg vacuum.
How can you speed up the vapor recovery process?
a. Use two recovery machines
b. A heater on the recovery vessel side will help to evacuate the vapor
Questions
What problem can using large vacuum pumps lead to and how can a technician
prevent it?
a. Power system overload
b. Can cause trapped water to freeze. During evacuation of systems
with large amounts of water, it may be necessary to increase
pressure by introducing nitrogen to counteract freezing
c. Collapse the tubing
d. Damage gaskets - ------------ANS: b. Can cause trapped water to freeze. During
evacuation of systems
with large amounts of water, it may be necessary to increase
pressure by introducing nitrogen to counteract freezing
After removal of liquid, about how much vapor will remain in the system on a 350
ton R-11 chiller?
a. 10 lbs of vapor after all the liquid has been removed
b. 20 lbs of vapor after all the liquid has been removed100 lbs of vapor after
all the liquid has been removed
c. 50 lbs of vapor after all the liquid has been removed
d. 100 lbs of vapor after all the liquid has been removed - ------------ANS: d. 100 lbs
of vapor after all the liquid has been removed
At what point in the system should you charge a low pressure system and what
should you start the charge with?
,a. Charge through the evaporator charging valve as this is the lowest
point on a low pressure system. First charge the system with vapor
b. Charge through the evaporator charging valve as this is the lowest point
on a low pressure system. First charge the system with liquid
c. Charge through the condenser charging valve as this is the lowest point
on a low pressure system. First charge the system with liquid
d. Charge through the purge charging valve as this is the lowest point on a
low - ------------ANS: a. Charge through the evaporator charging valve as this is the
lowest
point on a low pressure system. First charge the system with vapor
At what point in the system should you charge a low pressure system and what
should you start the charge with?
a. Charge through the evaporator charging valve as this is the lowest point on a low
pressure system. First charge the system with vapor
b. Charge through the evaporator charging valve as this is the lowest point on a low
pressure system. First charge the system with liquid
c. Charge through the condenser charging valve as this is the lowest point on a low
pressure system. First charge the system with liquid
d. Charge through the purge charging valve as this is the lowest point on a low
pressure system. First charge the system with vapor - ------------ANS: a. Charge
through the evaporator charging valve as this is the lowest
point on a low pressure system. First charge the system with vapor
Does refrigerant go out of the system in low pressure systems or does air and
moisture go in?
a. Refrigerant escapes through low pressure leaks.
b. Air and moisture enter the refrigeration system because it operates
, in a vacuum
c. Refrigerant leaks out through shaft seals and gaskets. - ------------ANS: b. Air and
moisture enter the refrigeration system because it operates
in a vacuum
How can a technician determine when it is safe to start charging with liquid
refrigerant?
a. Temperature of the water is 36F
b. Temperature of the water is above 32F
c. Temperature of the water is above 40F
d. Refrigerant saturation temperature reaches 36º F or the vapor
pressure reaches 16.9" Hg vacuum - ------------ANS: d. Refrigerant saturation
temperature reaches 36º F or the vapor
pressure reaches 16.9" Hg vacuum
How can a technician determine when it is safe to start charging with liquid
refrigerant?
a. Temperature of the water is 36F
b. Temperature of the water is above 32F
c. Temperature of the water is above 40F
d. Refrigerant saturation temperature reaches 36º F or the vapor pressure reaches
16.9" Hg vacuum. - ------------ANS: d. Refrigerant saturation temperature reaches
36º F or the vapor pressure reaches 16.9" Hg vacuum.
How can you speed up the vapor recovery process?
a. Use two recovery machines
b. A heater on the recovery vessel side will help to evacuate the vapor
