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EPA 608 MAINSTREAM EXAM QUESTIONS AND ANSWERS
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EPA 608 MAINSTREAM EXAM QUESTIONS AND ANSWERS
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EPA 608 MAINSTREAM EXAMQUESTIONS AND ANSWERS
Ashrae standard 15-1994 requires that all machinery rooms must be active an alarm
and mechanical ventilation before refrigerant concentrations exceed the? - answer-tiv-
twa threshold limit valve, time weighted average
Long hoses between the unit and the recovery machine should? - answer-not be used
because they cause excessive pressure drop and increased recovery time emissions
A binary blend is? - answer-two-part mixture
A ternary blend is a? - answer-three part mixture
The synthetic lubricant presently used with ternary blends is? - answer-alkylbenzene
When working with non-toxic refrigerants such as r-134a, r-12, r-22, and r-500? -
answer-safety glasses and butyl-lined gloves should be used.
Recycling or recover equipment using hermic compressors has the potential to overheat
when? - answer-drawing deep vacuums because the compressor motor relies on the
flow of refrigerant through the compressors for cooling
When a reclamation facility receives a tank of mixed refrigerant? - answer-it may refuse
to process the refrigeration and return it at the owners expense, or it may agree to
destroy the refrigerant, but typically as substantial fee is charged
An accurate pressure reading of the refrigerant inside a recovery cylinder is necessary
to? - answer-determine if excessive air or other non-condensable gasses are in the
cylinder
Refrigeration cylinders should be stored? - answer-stored vertically during shipping
When transporting cylinders containing used refrigerant, d.o.t requires? - answer-d.o.t
classification tags to be attached
After completing the transfer of liquid, refrigerant during the recovery unit and the
refrigeration system, be careful to? - answer-avoid trapping liquid refrigerant between
service valves of the refrigerant hose, because pressure can build up in the line and
burst the hose
Recovery is defined as? - answer-transferring refrigerant in any condition from a system
to a storage container without testing or purifying the refrigerant in any way
, Recycling is defined as ? - answer-cleaning of refrigerant for re-use by oil separation
and single or multiple gasses through moisture absorption devices
Hygroscopic means affinity for water so? - answer-hygroscopic oils are with a high
affinity for water
Psia? - answer-pounds per square inch absolute and stratospheric pressure is 14.7 psia
When using a vacuum pump, every effort should be made to reduce the pressure drop
between the vacuum pump and the system, therefore the piping connection should? -
answer-be as short as possible, using the largest diameter pipe that is practical
Psig is? - answer-the abbreviation for unit pressure and it stands for pounds per square
inch gage and is used in american refrigeration pressure gages,and its atmospheric
pressure is 0 psig
We must recover current refrigeration's to provide adequate refrigeration supplies
because? - answer-of the production bans as well as to prevent venting to the
atmosphere and resulting ozone depletion
Self contained recovery devices do not require the compressor or? - answer-any other
component of their conditioner for operation
Violation of the clean air act, including the knowing release of refrigerant during the
maintenance, service, repair, or disposal of appliances can? - answer-result in fines up
to $32,000 per day violation.
Every refrigerant system and refrigerant cylinder must be? - answer-protected by a
pressure-relief device
When does refrigerant leak check trace becomes absolutely necessary? - answer-only
an hcfc-22 nitrogen mixture can be used as a trace gas
An award of up to $10,000 may be paid to any person supplying information that leads
to a? - answer-penalty against a technician who is intentionally venting refrigerant
When first inspecting a hermic system known to be leaking you should? - answer-look
for traces of oil because this is an excellent indication of leaks
Service technicians who violate the clean air act provisions can? - answer-be fined, lose
their certification and face federal charges and fines
Never heat refrigerant storage or recovery tank with? - answer-an open flame, because
the tank may explode
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