Exam (elaborations)
EPA 608 TYPE 3/139 QUESTIONS AND ANSWERS (A+)
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- EPA 608 TYPE 3
- Institution
- EPA 608 TYPE 3
EPA 608 TYPE 3/139 QUESTIONS AND ANSWERS (A+)
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EPA 608 TYPE 3/139 QUESTIONSAND ANSWERS (A+)
On low pressure chillers, moisture typically enters the
refrigerant system through - √Answer :air leaks from
areas with gaskets or fittings
Quiz :The maximum test pressure for leak testing a low
pressure centrifugal is: - √Answer :10 psig
Quiz :Leak test and repair the chiller to reduce
refrigerant loss from a pruge unit on CFC-11 chiller -
√Answer :...
Quiz :A hydrostatic tube test kit is used to: -
√Answer :determine if a tube leaks
Quiz :Commercial and industrial process refrigeration
systems must be repaired when the leak rate exceeds
____ of the charge per year. - √Answer :35%
Quiz :Refrigerant recovery typically start with liquid
recovery it is faster. - √Answer :...
Quiz :A rupture disc on a recovery vessel for a low
pressure refrigerants relieves at: - √Answer :15 psig
Quiz :According to ASHRAE Guideline 3-1996, if the
pressure in a system rises from 1 mm Hg to a level
above ____ during a standing vacuum test, the system
should be checked for leaks. - √Answer :2.5 mm Hg
,Quiz :The primary water source for a recovery unit
condensing coil is _____. - √Answer :local municipal
water supply
Quiz :When recharging a refrigeration system with R-11,
what vaporpressure is necessary in the shells before
changing with liquid? - √Answer :16.9" Hg vacuum
Quiz :After recovering the liquid refrigerant you must: -
√Answer :recover the vapor refrigerant
Quiz :According to the EPA there is approximately
_____ refrigerant vapor left in an average 350 ton R-11
chiller at 0 psig pressure once all the R-11 liquid has
been removed. - √Answer :100 pounds
Quiz :Charging refrigerant liquid into a refrigeration
system when it is under a 29 inch Hg vacuum can cause
the: - √Answer :system water to freeze
Quiz :A system does not have to be evacuated all the
way to the required level when: - √Answer :leaks in the
appliance make evacuation to the prescribed level
unattainable
Quiz :Which of the foloowing repairs would ALWAYS be
considered "major" under EPA's -
√Answer :replacement of evaporator coil
Quiz :Under EPA's regulation's _______ is used to
pressurize a low pressure chiller for the purpose of
opening the system for a non major repair? -
√Answer :warming the refrigerant
, Quiz :If you are using a recovery machine manufactored
AFTER 11-15-93 you must evacuate an low pressure
appliance to _______ before making a major repair. -
√Answer :25 mm of Hg absolute
Quiz :After reaching the required recovery vacuum on a
chiller, you should - √Answer :Wait for at least a few
minutes to see if the system pressure rises, indicating
that there is till refrigerant in a liquid form or in the oil
Quiz :The pressure corresponding to 32 F for R-123 -
√Answer :20 inches of HG vacuum
Quiz :When evacuating a system the use of too large a
vacuum pump can cause? - √Answer :trapped water to
freeze
Quiz :Refrigerant-11 at a pressure of 17 inches HG
vacuum has a saturation temperature of: -
√Answer :35F
Quiz :During the evacuation of a system containing
large amounts of moisture you can prevent freezing of
this moisture by increasing the pressure with______gas
- √Answer :nitrogen
Quiz :ASHRAE standard 15-1994 requires that each
machinery room must activate an alarm and mechanical
ventilation beofre refrigerant concentrations exceed: -
√Answer :the threshold limit valve and time weighted
average
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