A/C Service and Refrigeration Exam Questions with Correct Answers
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Course
Refrigeration machine operator
Institution
Refrigeration Machine Operator
flash-gas - Answer-The presence of ___________ in the liquid lines reduces the efficiency of the refrigeration cycle, leads several expansion systems to work improperly and, increases superheating in vapor.
A1 - Answer-According to ASHRAE refrigerant safety classification standard which designat...
A/C Service and Refrigeration Exam
Questions with Correct Answers
flash-gas - Answer-The presence of ___________ in the liquid lines reduces the
efficiency of the refrigeration cycle, leads several expansion systems to work improperly
and, increases superheating in vapor.
A1 - Answer-According to ASHRAE refrigerant safety classification standard which
designation would be the safest ?
Attach DOT classification tags - Answer-When transporting cylinders containing used
refrigerant, DOT requires that you ?
CFC - Answer-What compound has the highest ozone depletion potential (ODP) ?
yellow tops and gray bodies - Answer-Approved refrigerant recovery cylinders can be
identified by which color code ?
ARI 700 - Answer-Under EPA's regulations, what standard must reclaimed refrigerant
meet before it can be resold ?
a low pressure vapor. - Answer-The state of refrigerant entering the compressor of a
refrigeration system is ?
a condenser or, an evaporator - Answer-Replacement of ________________ is a repair
which would always be considered major under EPA's regulations.
recycling. - Answer-Refrigerant that is cleaned using oil separation and single or
multiple passes through devices, such as replaceable core filter-driers, which reduce
moisture, acidity, and particulate matter is ___________________.
electronic leak detector - Answer-Which leak detection method is most effective for
locating the general area of the small leak ?
PSIG and inches of mercury - Answer-A compound pressure gauge for the low side of a
system measures pressure in ?
traces of oil - Answer-When first inspecting a hermetic system known to be leaking you
should first look for ?
only charge with nitrogen vapor and use a regulator. - Answer-When charging a system
with nitrogen ______________.
, saturated or sub-cooled high-pressure liquid - Answer-Refrigerant entering the Thermal
Expansion Device of an R-22 heat pump is ___________.
hydrochloric and hydrofluoric acid or, phosgene gas. - Answer-At high temperatures R-
12 and R-22 can decompose to form _____________.
oxygen deprivation - Answer-According to ASHRAE Standard 15 a sensor and alarm
are required for type A-1 refrigerants to sense ___________.
sight glass - Answer-A __________ is not a method presently used for checking the fill
level in a recovery tank.
number of cylinders of each gas - Answer-Dot regulations 49 CFR requires that the
___________ be recorded on the shipping paper for a hazard class 2.2 non flammable
compressed gas.
wearing a respirator - Answer-Which of the following is not a standard recommended
safe work practice when recovering refrigerants ?
the charge is more than 15 pounds - Answer-System dependent recovery equipment
cannot be used when ______________.
processed so that it meets the standard for new refrigerant. - Answer-Reclamation of a
refrigerant means that it is ______________.
boil off or, vaporize - Answer-The principle of evacuating a system using a vacuum
pump is to lower the system pressure so any moisture can ________________.
the system to work harder due to increase in condensing temperature. - Answer-Air in a
refrigeration system mainly causes ____________.
micron gauge - Answer-The most accurate way to measure a vacuum is with a
___________.
500 - Answer-What is the micron level to which a system should be evacuated down
to ?
both liquid and vapor refrigerant - Answer-When charging refrigerant by weight you can
charge with _____________.
refrigerant liquid at the expansion device - Answer-The sub-cooling charging method
gives an introduction to the amount of __________.
fractionation - Answer-What is the process called when each of the refrigerants used in
a blended refrigerant leak at a different rate if released into the atmosphere changing
the proportions of the refrigerants used in the blend ?
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