Page 1 of 39
Refrigeration Exam 1 NEWEST COMPLETE QUESTIONS
AND VERIFIED SOLUTIONS 2026-2027 LATEST UPDATE
THIS YEAR
QUESTION: A refrigeration engineer is logging readings from a reciprocating system.
Compressor discharge temperature have dropped significantly and the suction line pressure is
high. Which of the following that may be causing this set of condition? - ANSWER-an expansion
valve that is open to wide
QUESTION: a low side float valve is used to maintain: - ANSWER-the level of the refrigerant in
the evaporator
QUESTION: regarding fire safety, which ASHRAE refrigerant safety classification indicates no
flammability and lower toxicity? - ANSWER-A1
QUESTION: when an expansion valve is operating properly, at the end of the evaporator will
contain: - ANSWER-only superheated vapor
,Page 2 of 39
QUESTION: what information is not contained in a Material Safety Data Sheet-MSDS? -
ANSWER-cost of the material
QUESTION: in a steam turbine, what is the function of the Kingsbury thrust bearing? - ANSWER-
maintain axial positioning of the rotor shaft
QUESTION: a centrifugal water pump is considered to the fully primed when - ANSWER-the
pump is full of liquid
QUESTION: Copper tubing refrigerant lines must be installed for a new system. It is a well
known service practice that tubing collapses at bends that must be made, the refrigerant
engineer should use - ANSWER-level type tubing bender
QUESTION: A reciprocating compressor is making a knocking sound during operation. If the
refrigerant worn parts are not causing the knocking, what is the probably the cause? - ANSWER-
the slugging of the liquid refrigerant
QUESTION: in order for a refrigerant to become superheated it must be heated in a section of
the low side refrigerant line: - ANSWER-where no liquid refrigerant is present
,Page 3 of 39
QUESTION: all liquid has been recovered from a system to be overhauled, the system -
ANSWER-should not be opened until all vapor has been recovered
QUESTION: when a refrigerant engineer uses a portable compressor recovery unit to remove
vapor refrigerant from a refrigeration system the removal rate of the refrigerant will gradually
slow down because - ANSWER-the compressor efficiency is decreasing
QUESTION: You are the engineer running a 2000-ton (steam driven turbine) centrifugal
refrigeration system, a refrigeration system supplies chilled water to a college campus with
multiple buildings. During the course of making your rounds, you check the 9 cell cooling tower
on the roof. You note the water level in all of the cooling tower cells is very low. Which one of
the following immediate actions would take? - ANSWER-add additional make up water to
cooling tower
Q; efficiency of the refrigerant cycle is affected by the operations of the condenser. Of the
following, a more efficient centrifugal compressor operation results from: - ANSWER-Lowering
the condensing pressure
, Page 4 of 39
QUESTION: The heat removed from the refrigerant in a condenser is: - ANSWER-sensible and
latent heat
QUESTION: The refrigerant unit that you have been assigned to is being taken out of service for
a major repair. You have been assigned to withdraw refrigerant for storage in suitable
containers. According to the NYC fire code, you must ensure that the containers: - ANSWER-Are
approved by the US Dept. of Transportation
QUESTION: which of the following best describes how the cylinder unloader work? - ANSWER-
keep in the suction valve opened while the compressor is in the return stroke
QUESTION: in most semi Hermetic compressors, the suction vapor is used to: - ANSWER-cools
the motor
QUESTION: The amount of refrigerant that flows through the orifices of an economizer is
determined by the: - ANSWER-differences between the high side and low side pressure
QUESTION: the installation of an inline refrigerant cleaning system is advisable: - ANSWER-to
remove impurities from the system
Refrigeration Exam 1 NEWEST COMPLETE QUESTIONS
AND VERIFIED SOLUTIONS 2026-2027 LATEST UPDATE
THIS YEAR
QUESTION: A refrigeration engineer is logging readings from a reciprocating system.
Compressor discharge temperature have dropped significantly and the suction line pressure is
high. Which of the following that may be causing this set of condition? - ANSWER-an expansion
valve that is open to wide
QUESTION: a low side float valve is used to maintain: - ANSWER-the level of the refrigerant in
the evaporator
QUESTION: regarding fire safety, which ASHRAE refrigerant safety classification indicates no
flammability and lower toxicity? - ANSWER-A1
QUESTION: when an expansion valve is operating properly, at the end of the evaporator will
contain: - ANSWER-only superheated vapor
,Page 2 of 39
QUESTION: what information is not contained in a Material Safety Data Sheet-MSDS? -
ANSWER-cost of the material
QUESTION: in a steam turbine, what is the function of the Kingsbury thrust bearing? - ANSWER-
maintain axial positioning of the rotor shaft
QUESTION: a centrifugal water pump is considered to the fully primed when - ANSWER-the
pump is full of liquid
QUESTION: Copper tubing refrigerant lines must be installed for a new system. It is a well
known service practice that tubing collapses at bends that must be made, the refrigerant
engineer should use - ANSWER-level type tubing bender
QUESTION: A reciprocating compressor is making a knocking sound during operation. If the
refrigerant worn parts are not causing the knocking, what is the probably the cause? - ANSWER-
the slugging of the liquid refrigerant
QUESTION: in order for a refrigerant to become superheated it must be heated in a section of
the low side refrigerant line: - ANSWER-where no liquid refrigerant is present
,Page 3 of 39
QUESTION: all liquid has been recovered from a system to be overhauled, the system -
ANSWER-should not be opened until all vapor has been recovered
QUESTION: when a refrigerant engineer uses a portable compressor recovery unit to remove
vapor refrigerant from a refrigeration system the removal rate of the refrigerant will gradually
slow down because - ANSWER-the compressor efficiency is decreasing
QUESTION: You are the engineer running a 2000-ton (steam driven turbine) centrifugal
refrigeration system, a refrigeration system supplies chilled water to a college campus with
multiple buildings. During the course of making your rounds, you check the 9 cell cooling tower
on the roof. You note the water level in all of the cooling tower cells is very low. Which one of
the following immediate actions would take? - ANSWER-add additional make up water to
cooling tower
Q; efficiency of the refrigerant cycle is affected by the operations of the condenser. Of the
following, a more efficient centrifugal compressor operation results from: - ANSWER-Lowering
the condensing pressure
, Page 4 of 39
QUESTION: The heat removed from the refrigerant in a condenser is: - ANSWER-sensible and
latent heat
QUESTION: The refrigerant unit that you have been assigned to is being taken out of service for
a major repair. You have been assigned to withdraw refrigerant for storage in suitable
containers. According to the NYC fire code, you must ensure that the containers: - ANSWER-Are
approved by the US Dept. of Transportation
QUESTION: which of the following best describes how the cylinder unloader work? - ANSWER-
keep in the suction valve opened while the compressor is in the return stroke
QUESTION: in most semi Hermetic compressors, the suction vapor is used to: - ANSWER-cools
the motor
QUESTION: The amount of refrigerant that flows through the orifices of an economizer is
determined by the: - ANSWER-differences between the high side and low side pressure
QUESTION: the installation of an inline refrigerant cleaning system is advisable: - ANSWER-to
remove impurities from the system
