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Michigan Mechanical Exam Limited Refrigeration and Cooling
Service Questions and Answers with 100% Complete Solutions
UPDATED!!!
According to ASHRAE refrigerant safety classification standard,
which of the following designations would be the safest? -
ANSWER A1
When transporting cylinders containing used refrigerant, DOT
requires that you - ANSWER attach DOT classification tags.
Which compounds have the highest ozone depletion potential
(ODP)? - ANSWER CFCs
Approved refrigerant recovery cylinders can be identified by
which color code - ANSWER yellow tops and gray bodies
Under EPA's regulations, what standard must reclaimed
refrigerant meet before it can be resold? - ANSWER ARI 700
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The state of the refrigerant entering the compressor of a
refrigeration system is - ANSWER low pressure vapor
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 -
ANSWER Recycling
Which of the following leak detection methods is the most
effective for locating the general area of a small leak? - ANSWER
Electronic leak detector
A compound pressure gauge for the low side of a system
measures pressure in - ANSWER Psig and Inches of mercury ( in.
Hg)
When first inspecting a hermetic system known to be leaking
you should look for - ANSWER Traces of oil
When charging a system with nitrogen - ANSWER Only charge
with nitrogen vapor and use a regulator
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Refrigerant entering the Thermal Expansion Device of an R-22
heat pump is - ANSWER Saturated or sub-cooled liquid
Replacement of is a repair which would always be considered a
major repair under EPAs regulations - ANSWER An evaporator
or a condenser
At high temperature R-12 and R-22 can decompose to form -
ANSWER hydrochloric and hydroflouric acid or phosgene gas
According to ASHRAE standard 15, a sensor and alarm are
required for type A-1 refrigerants to sense - ANSWER oxygen
deprivation
A is a method not presently used for checking the fill level in a
recovery tank. - ANSWER sight glass
DOT Regulations 49 CFR requires that the ____________ be
recorded on the shipping paper for a hazard class 2.2
nonflammable compressed gas. - ANSWER number of cylinders
of each gas.
Michigan Mechanical Exam Limited Refrigeration and Cooling
Service Questions and Answers with 100% Complete Solutions
UPDATED!!!
According to ASHRAE refrigerant safety classification standard,
which of the following designations would be the safest? -
ANSWER A1
When transporting cylinders containing used refrigerant, DOT
requires that you - ANSWER attach DOT classification tags.
Which compounds have the highest ozone depletion potential
(ODP)? - ANSWER CFCs
Approved refrigerant recovery cylinders can be identified by
which color code - ANSWER yellow tops and gray bodies
Under EPA's regulations, what standard must reclaimed
refrigerant meet before it can be resold? - ANSWER ARI 700
,2|Page
The state of the refrigerant entering the compressor of a
refrigeration system is - ANSWER low pressure vapor
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 -
ANSWER Recycling
Which of the following leak detection methods is the most
effective for locating the general area of a small leak? - ANSWER
Electronic leak detector
A compound pressure gauge for the low side of a system
measures pressure in - ANSWER Psig and Inches of mercury ( in.
Hg)
When first inspecting a hermetic system known to be leaking
you should look for - ANSWER Traces of oil
When charging a system with nitrogen - ANSWER Only charge
with nitrogen vapor and use a regulator
, 3|Page
Refrigerant entering the Thermal Expansion Device of an R-22
heat pump is - ANSWER Saturated or sub-cooled liquid
Replacement of is a repair which would always be considered a
major repair under EPAs regulations - ANSWER An evaporator
or a condenser
At high temperature R-12 and R-22 can decompose to form -
ANSWER hydrochloric and hydroflouric acid or phosgene gas
According to ASHRAE standard 15, a sensor and alarm are
required for type A-1 refrigerants to sense - ANSWER oxygen
deprivation
A is a method not presently used for checking the fill level in a
recovery tank. - ANSWER sight glass
DOT Regulations 49 CFR requires that the ____________ be
recorded on the shipping paper for a hazard class 2.2
nonflammable compressed gas. - ANSWER number of cylinders
of each gas.
