EPA 608 TYPE EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
When first inspecting a hermetic system known to be leaking, you should look
for? - ANS -traces of oil.
If you back-seat a compressor discharge shutoff valve, you ________. - ANS -close
the gauge port
________ is a potential refrigerant for a low-pressure chiller. - ANS -R-123
If the ________, a reciprocating compressor could be damaged if energized. - ANS
-discharge service valve is closed
According to the EPA, soap bubbles are best used to ________. - ANS -pin point
refrigerant leaks
A factory has a chiller with 200 pounds of charge that uses 65% of the chiller's
cooling capacity to cool a manufacturing line and the remaining 35% of the
chiller's cooling capacity is used to air condition the office space in the factory.
Which leak rate category would this chiller be in? - ANS -industrial process
refrigeration
If an owner of a system with a charge of 50 or more pounds decides to retire the
unit and replace the unit with a new unit that uses an EXEMPT refrigerant, the
appliance owner has ________ to retire the appliance. - ANS -18 months
Owners of a cold storage warehouse can't repair their R-22 refrigeration unit
(normal system charge is 80 pounds), so they are going to retire the unit. The
owner plans to operate the unit until it is retired. How much refrigerant can be
added to the leaking system, before it is retired? - ANS -none
Oil foaming usually occurs in the ________. - ANS -compressor
, Before recovering refrigerant from a compressor in a parallel compressor system,
you must ________ as well as close both the compressor inlet and outlet
connections. - ANS -close the oil equalization connection
Why do manifold gauge set hoses have self-sealing connectors or hand valves on
the ends of the hoses? - ANS -Because they are required by the EPA
To minimize refrigerant losses when the hoses are connected and disconnected to
the system
Non-condensable gasses trapped in a system cause a ________. - ANS -higher
discharge pressure
When performing a dehydration evacuation on a system with lots of water in the
system, it might be necessary to introduce ________ and counteract the freezing
of the moisture in the system. - ANS -nitrogen gas into the system to increase the
pressure
You must calculate the leak rate ________. - ANS -every time you top off a system
that has a normal charge of 50 pounds or more
A comfort-cooling appliance containing 60 pounds of refrigerant has a significant
leak (leaking beyond the applicable leak rate threshold). You have ________ to
repair the leak and perform a successful initial leak verification test. - ANS -30
days
It is against EPA regulations to use system-dependent recovery unit when the
________. - ANS -appliance contains over 15 pounds of refrigerant
To mothball a system with 60 pounds of refrigerant, you must ________. - ANS -
shut down the appliance temporarily, and recover the refrigerant from the
leaking isolated section or from the entire system to at least atmospheric
pressure
After all the liquid refrigerant has been recovered from a system, the remaining
vapor ________. - ANS -must be removed by the recovery system to the required
evacuation level
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
When first inspecting a hermetic system known to be leaking, you should look
for? - ANS -traces of oil.
If you back-seat a compressor discharge shutoff valve, you ________. - ANS -close
the gauge port
________ is a potential refrigerant for a low-pressure chiller. - ANS -R-123
If the ________, a reciprocating compressor could be damaged if energized. - ANS
-discharge service valve is closed
According to the EPA, soap bubbles are best used to ________. - ANS -pin point
refrigerant leaks
A factory has a chiller with 200 pounds of charge that uses 65% of the chiller's
cooling capacity to cool a manufacturing line and the remaining 35% of the
chiller's cooling capacity is used to air condition the office space in the factory.
Which leak rate category would this chiller be in? - ANS -industrial process
refrigeration
If an owner of a system with a charge of 50 or more pounds decides to retire the
unit and replace the unit with a new unit that uses an EXEMPT refrigerant, the
appliance owner has ________ to retire the appliance. - ANS -18 months
Owners of a cold storage warehouse can't repair their R-22 refrigeration unit
(normal system charge is 80 pounds), so they are going to retire the unit. The
owner plans to operate the unit until it is retired. How much refrigerant can be
added to the leaking system, before it is retired? - ANS -none
Oil foaming usually occurs in the ________. - ANS -compressor
, Before recovering refrigerant from a compressor in a parallel compressor system,
you must ________ as well as close both the compressor inlet and outlet
connections. - ANS -close the oil equalization connection
Why do manifold gauge set hoses have self-sealing connectors or hand valves on
the ends of the hoses? - ANS -Because they are required by the EPA
To minimize refrigerant losses when the hoses are connected and disconnected to
the system
Non-condensable gasses trapped in a system cause a ________. - ANS -higher
discharge pressure
When performing a dehydration evacuation on a system with lots of water in the
system, it might be necessary to introduce ________ and counteract the freezing
of the moisture in the system. - ANS -nitrogen gas into the system to increase the
pressure
You must calculate the leak rate ________. - ANS -every time you top off a system
that has a normal charge of 50 pounds or more
A comfort-cooling appliance containing 60 pounds of refrigerant has a significant
leak (leaking beyond the applicable leak rate threshold). You have ________ to
repair the leak and perform a successful initial leak verification test. - ANS -30
days
It is against EPA regulations to use system-dependent recovery unit when the
________. - ANS -appliance contains over 15 pounds of refrigerant
To mothball a system with 60 pounds of refrigerant, you must ________. - ANS -
shut down the appliance temporarily, and recover the refrigerant from the
leaking isolated section or from the entire system to at least atmospheric
pressure
After all the liquid refrigerant has been recovered from a system, the remaining
vapor ________. - ANS -must be removed by the recovery system to the required
evacuation level
