AHR-110 Exam 3 Study Guide Newest 2026 Questions
and Correct Detailed Answers Already Graded A+
Which of the following conditions requires a system cleanup, an oil test, and
oversized filters to be added to the system? - CORRECT ANSWER-A
compressor motor burnout
A large refrigeration system that contains a significant amount of moisture should
be evacuated with - CORRECT ANSWER-A high CFM vacuum pump
Proper maintenance for a vacuum pump would include which of the following? -
CORRECT ANSWER-Changing the oil as often as necessary
When a deep vacuum is reached (500 microns), the system valved and observed
for 10 to 15 minutes. A rise in pressure could indicate which of the following? -
CORRECT ANSWER-There may be a leak or the presence of air and/or moisture
One of the advantages of a microfoam leak detection solution over standard
bubble solutions is that it - CORRECT ANSWER-Will not pit or corrode the
components
,An oily dust spot on a condenser or evaporator coil could indicate - CORRECT
ANSWER-A refrigerant leak
The most common type of system leaks are __________ leaks. - CORRECT
ANSWER-Standing
A(n) ____________ leak detector requires a lubricant-specific dye be injected into
a charged system to find the leak. - CORRECT ANSWER-Ultraviolet
Removing air and/or other noncondensable gases from a system using a vacuum
pump is called ___________. - CORRECT ANSWER-Degassing
The process of removing both noncondensable gases and water vapor is called
________. - CORRECT ANSWER-Evacuation
Sludge and other solids can be removed from a system by using __________. -
CORRECT ANSWER-liquid- and suction-line filter/driers
Atmospheric pressure, 0 psig, is the equivalent of about __________ microns. -
CORRECT ANSWER-760,000
, (T/F): The process of a solid changing to a vapor without passing through the
liquid state is called dehydration. - CORRECT ANSWER-False
(T/F): A system with Schrader valve gauge ports will take longer to evacuate than
a system with service valves. - CORRECT ANSWER-True
A ¼ inch service hose will only allow a vacuum pump to pull at _____ CFM,
regardless of the pump's CFM rating. - CORRECT ANSWER-0.8
The mechanical strain of motion, rotation, and refrigerant flow are all associated
with _________ leaks. - CORRECT ANSWER-Vibration-Dependent
The low-pressure side of the system must not be pressurized to more
than_________ when testing for leaks. - CORRECT ANSWER-The low-side
design pressure
Standing, pressure-dependent, temperature-dependent, vibration-dependent,
combination-dependent, and micro are all types of - CORRECT ANSWER-Leak
Methods
and Correct Detailed Answers Already Graded A+
Which of the following conditions requires a system cleanup, an oil test, and
oversized filters to be added to the system? - CORRECT ANSWER-A
compressor motor burnout
A large refrigeration system that contains a significant amount of moisture should
be evacuated with - CORRECT ANSWER-A high CFM vacuum pump
Proper maintenance for a vacuum pump would include which of the following? -
CORRECT ANSWER-Changing the oil as often as necessary
When a deep vacuum is reached (500 microns), the system valved and observed
for 10 to 15 minutes. A rise in pressure could indicate which of the following? -
CORRECT ANSWER-There may be a leak or the presence of air and/or moisture
One of the advantages of a microfoam leak detection solution over standard
bubble solutions is that it - CORRECT ANSWER-Will not pit or corrode the
components
,An oily dust spot on a condenser or evaporator coil could indicate - CORRECT
ANSWER-A refrigerant leak
The most common type of system leaks are __________ leaks. - CORRECT
ANSWER-Standing
A(n) ____________ leak detector requires a lubricant-specific dye be injected into
a charged system to find the leak. - CORRECT ANSWER-Ultraviolet
Removing air and/or other noncondensable gases from a system using a vacuum
pump is called ___________. - CORRECT ANSWER-Degassing
The process of removing both noncondensable gases and water vapor is called
________. - CORRECT ANSWER-Evacuation
Sludge and other solids can be removed from a system by using __________. -
CORRECT ANSWER-liquid- and suction-line filter/driers
Atmospheric pressure, 0 psig, is the equivalent of about __________ microns. -
CORRECT ANSWER-760,000
, (T/F): The process of a solid changing to a vapor without passing through the
liquid state is called dehydration. - CORRECT ANSWER-False
(T/F): A system with Schrader valve gauge ports will take longer to evacuate than
a system with service valves. - CORRECT ANSWER-True
A ¼ inch service hose will only allow a vacuum pump to pull at _____ CFM,
regardless of the pump's CFM rating. - CORRECT ANSWER-0.8
The mechanical strain of motion, rotation, and refrigerant flow are all associated
with _________ leaks. - CORRECT ANSWER-Vibration-Dependent
The low-pressure side of the system must not be pressurized to more
than_________ when testing for leaks. - CORRECT ANSWER-The low-side
design pressure
Standing, pressure-dependent, temperature-dependent, vibration-dependent,
combination-dependent, and micro are all types of - CORRECT ANSWER-Leak
Methods
