1
refrigeration Questions with Answers (100%
Correct Answers)
excessive moisture being collected in the purge unit of a low-pressure
refrigeration system could indicate which probable condition? Answer: leaking
condenser or chiller tubes
moisture in a refrigeration system can cause which of the following conditions?
Answer: freezing the expansion valve closed, hermetic burner blowout, and
corrosion of system piping.
all the above
if the combination moisture indicator and sight glass indicates an accumulation
of moisture within the system, which of the listed procedures would be the
most practical to follow? Answer: close the king valve, pump down the system,
isolate the drier, remove the desiccant core, and replace the new drier cartridge.
what is a quick method used to test a water-cooled condenser for the presence
of a refrigerant leak without actually pinpointing the actual location? Answer:
check the drains on the condenser heads with a halide torch.
some chlorinated fluorocarbon refrigerants may decompose into a toxic
irritating gas under what conditions? Answer: exposed to an open flame or hot
surface
what must be done to use standard leak detection methods on a low-pressure
refrigeration system charged with refrigerant? Answer: raise the pressure in the
system above atmospheric
to test for a suspected large refrigerant leak from an R-22 refrigeration system in
an enclosed area , how should this be done? Answer: apply a soap solution to
fittings seen to have oil residue
, 2
which of the following statements is true concerning the testing of an R-22
refrigeration system for leaks in an enclosed compartment with a halide torch?
Answer: halide torches are useful in locating very small R-22 leaks
what is the color of a flame produced by a halide torch when there is no
halogenated refrigerant present at the location of the exploring tube Answer:
blue
moisture is removed from recovered refrigerant using a recycling machine by
what means? Answer: circulating the refrigerant through a dehydrator
what must be done, at a minimum, before a system can legally be opened up
for repairs while adhering to the prohibition against the venting of halogenated
fluorocarbon refrigerants to the atmosphere? Answer: recovery of the
refrigerant
in a refrigeration system,the push-pull technique can be used for the recovery of
the refrigerant in what state? Answer: both liquid and vapor
in reclaiming recovered refrigerant, which type of contamination will the
reclamation process be unable to separate? Answer: mixed refrigerants
when removing the primary refrigerant from a system using water as a
secondary refrigerant, it is important to follow which procedure(s) to safeguard
the equipment? Answer: insure the water is drained or continually circulating
to avoid freeze-up.
what is the correct color-coding of refrigerant recovery cylinders regardless of
the refrigerant contained within? Answer: yellow top and grey body
A "hydroscopic" lubricant used in a refrigeration compressors would have what
characteristic? Answer: having a high affinity for moisture which requires it to
be kept in a sealed container
what is the most important consideration in selecting a lubricating oil for use in
a refrigeration compressor? Answer: have a low pour point
refrigeration Questions with Answers (100%
Correct Answers)
excessive moisture being collected in the purge unit of a low-pressure
refrigeration system could indicate which probable condition? Answer: leaking
condenser or chiller tubes
moisture in a refrigeration system can cause which of the following conditions?
Answer: freezing the expansion valve closed, hermetic burner blowout, and
corrosion of system piping.
all the above
if the combination moisture indicator and sight glass indicates an accumulation
of moisture within the system, which of the listed procedures would be the
most practical to follow? Answer: close the king valve, pump down the system,
isolate the drier, remove the desiccant core, and replace the new drier cartridge.
what is a quick method used to test a water-cooled condenser for the presence
of a refrigerant leak without actually pinpointing the actual location? Answer:
check the drains on the condenser heads with a halide torch.
some chlorinated fluorocarbon refrigerants may decompose into a toxic
irritating gas under what conditions? Answer: exposed to an open flame or hot
surface
what must be done to use standard leak detection methods on a low-pressure
refrigeration system charged with refrigerant? Answer: raise the pressure in the
system above atmospheric
to test for a suspected large refrigerant leak from an R-22 refrigeration system in
an enclosed area , how should this be done? Answer: apply a soap solution to
fittings seen to have oil residue
, 2
which of the following statements is true concerning the testing of an R-22
refrigeration system for leaks in an enclosed compartment with a halide torch?
Answer: halide torches are useful in locating very small R-22 leaks
what is the color of a flame produced by a halide torch when there is no
halogenated refrigerant present at the location of the exploring tube Answer:
blue
moisture is removed from recovered refrigerant using a recycling machine by
what means? Answer: circulating the refrigerant through a dehydrator
what must be done, at a minimum, before a system can legally be opened up
for repairs while adhering to the prohibition against the venting of halogenated
fluorocarbon refrigerants to the atmosphere? Answer: recovery of the
refrigerant
in a refrigeration system,the push-pull technique can be used for the recovery of
the refrigerant in what state? Answer: both liquid and vapor
in reclaiming recovered refrigerant, which type of contamination will the
reclamation process be unable to separate? Answer: mixed refrigerants
when removing the primary refrigerant from a system using water as a
secondary refrigerant, it is important to follow which procedure(s) to safeguard
the equipment? Answer: insure the water is drained or continually circulating
to avoid freeze-up.
what is the correct color-coding of refrigerant recovery cylinders regardless of
the refrigerant contained within? Answer: yellow top and grey body
A "hydroscopic" lubricant used in a refrigeration compressors would have what
characteristic? Answer: having a high affinity for moisture which requires it to
be kept in a sealed container
what is the most important consideration in selecting a lubricating oil for use in
a refrigeration compressor? Answer: have a low pour point
