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Michigan mechanical exam- A/C service and Refrigeration
Questions and Answers with 100% Complete Solutions
UPDATED!!!
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 ?
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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 ?
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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.
Michigan mechanical exam- A/C service and Refrigeration
Questions and Answers with 100% Complete Solutions
UPDATED!!!
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 ?
,2|Page
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 ?
, 3|Page
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.
