EPA 608 Type III EXAM 2024-2025 QUESTIONS AND ANSWERS 100 % PASS A+
GRADE
On a low-pressure chiller with an open-type compressor, the ________ is very susceptible to leaks.
a) chiller tubes
b) shaft seal
c) charging connections
d) shaft bearings - answer>>b) shaft seal
The PRIMARY purpose of a purge unit on a CFC-11 chiller is to: ___________.
a) remove CFCs from the system
b) condense air out of the system
c) condense water out of the system
d) remove non-condensables from the system - answer>>d) remove non-condensables from the system
Which safety precautions should be adhered to for low pressure systems?
a) Do not siphon refrigerant by mouth.
b) Avoid spilling liquid refrigerant on the skin.
c) Use gloves and safety goggles when working with liquid refrigerant.
d) All of the above. - answer>>d) All of the above.
When there is excessive moisture collecting in the purge unit of a low pressure refrigeration system,
this indicates that: _________.
,a) the system was charged with contaminated refrigerant
b) the condenser or chiller barrel tubes are leaking
c) the purge unit is not operating properly
d) the purge unit needs adjustment - answer>>b) the condenser or chiller barrel tubes are leaking
During chiller evacuation, water is circulated to: _________.
a) speed up the recovery process
b) prevent loss of refrigerant to the atmosphere
c) prevent freezing of the water
d) maintain constant refrigerant pressure - answer>>c) prevent freezing of the water
A system does not have to be evacuated all the way to the required level when: __________.
a) the repair is major
b) the repair is followed by an evacuation of the appliance to the environment
c) the appliance is being disposed of
d) leaks in the appliance make evacuation to the prescribed level unattainable - answer>>d) leaks in the
appliance make evacuation to the prescribed level unattainable
What is meant by the term "high efficiency purge unit"?
a) Those purge units which discharge a high percentage of refrigerant with the air which they remove.
b) Those purge units which discharge a low percentage of refrigerant with the air which they remove.
c) Those purge units which draw very little electrical power.
, d) None of the above. - answer>>b) Those purge units which discharge a low percentage of refrigerant
with the air which they remove.
The maximum test pressure for leak testing a low pressure centrifugal is: ________.
a) 0 psig
b) 10 psig
c) 25 psig
d) 50 psig - answer>>b) 10 psig
When recharging a refrigeration system with R-11, what vapor pressure is necessary in the shells
before charging with liquid?
a) 21.1 inches of Hg vacuum
b) 19.7 inches of Hg vacuum
c) 18.1 inches of Hg vacuum
d) 16.9 inches of Hg vacuum - answer>>d) 16.9 inches of Hg vacuum
During the evacuation of a system containing large amounts of moisture, you can prevent freezing of
this moisture by increasing the pressure with ______ gas.
a) nitrogen
b) R-22
c) air
d) oxygen - answer>>a) nitrogen
Both CFC-11 and HCFC-123 chillers require purge units because: ___________.
GRADE
On a low-pressure chiller with an open-type compressor, the ________ is very susceptible to leaks.
a) chiller tubes
b) shaft seal
c) charging connections
d) shaft bearings - answer>>b) shaft seal
The PRIMARY purpose of a purge unit on a CFC-11 chiller is to: ___________.
a) remove CFCs from the system
b) condense air out of the system
c) condense water out of the system
d) remove non-condensables from the system - answer>>d) remove non-condensables from the system
Which safety precautions should be adhered to for low pressure systems?
a) Do not siphon refrigerant by mouth.
b) Avoid spilling liquid refrigerant on the skin.
c) Use gloves and safety goggles when working with liquid refrigerant.
d) All of the above. - answer>>d) All of the above.
When there is excessive moisture collecting in the purge unit of a low pressure refrigeration system,
this indicates that: _________.
,a) the system was charged with contaminated refrigerant
b) the condenser or chiller barrel tubes are leaking
c) the purge unit is not operating properly
d) the purge unit needs adjustment - answer>>b) the condenser or chiller barrel tubes are leaking
During chiller evacuation, water is circulated to: _________.
a) speed up the recovery process
b) prevent loss of refrigerant to the atmosphere
c) prevent freezing of the water
d) maintain constant refrigerant pressure - answer>>c) prevent freezing of the water
A system does not have to be evacuated all the way to the required level when: __________.
a) the repair is major
b) the repair is followed by an evacuation of the appliance to the environment
c) the appliance is being disposed of
d) leaks in the appliance make evacuation to the prescribed level unattainable - answer>>d) leaks in the
appliance make evacuation to the prescribed level unattainable
What is meant by the term "high efficiency purge unit"?
a) Those purge units which discharge a high percentage of refrigerant with the air which they remove.
b) Those purge units which discharge a low percentage of refrigerant with the air which they remove.
c) Those purge units which draw very little electrical power.
, d) None of the above. - answer>>b) Those purge units which discharge a low percentage of refrigerant
with the air which they remove.
The maximum test pressure for leak testing a low pressure centrifugal is: ________.
a) 0 psig
b) 10 psig
c) 25 psig
d) 50 psig - answer>>b) 10 psig
When recharging a refrigeration system with R-11, what vapor pressure is necessary in the shells
before charging with liquid?
a) 21.1 inches of Hg vacuum
b) 19.7 inches of Hg vacuum
c) 18.1 inches of Hg vacuum
d) 16.9 inches of Hg vacuum - answer>>d) 16.9 inches of Hg vacuum
During the evacuation of a system containing large amounts of moisture, you can prevent freezing of
this moisture by increasing the pressure with ______ gas.
a) nitrogen
b) R-22
c) air
d) oxygen - answer>>a) nitrogen
Both CFC-11 and HCFC-123 chillers require purge units because: ___________.
