Michigan mechanical
exam- A/C service and
Refrigeration
questions with verified
solutions 2025-
2026(100% pass)
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 ?
exam- A/C service and
Refrigeration
questions with verified
solutions 2025-
2026(100% pass)
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 ?
