MASSACHUSETTS REFRIGERATION LICENSE
FINAL STUDY PAPER 2026 QUESTIONS
WITH ANSWERS GRADED A+
●● If a low-pressure chiller has a low-side leak, which of the following
will most likely result? Answer: High suction pressure and High
discharge pressure
●● A pressure vessel having an inside diameter of 6" or less shall be
sufficient to withstand ____times the pressure of the saturation
temperature of the refrigerant or ____times the critical pressure of the
refrigerant, whichever is less Answer: 2.5, 2.5
●● Oils, classified as to source, are Answer: Animal, vegitabal, mineral
●● Low pressure systems have what kind of compressor? Answer:
Centrifugal
●● What will occur if the strong solution in an absorption chiller
becomes too strong? Answer: Machine will stop cooling and the solution
will crystalize
, ●● If a liquid receiver is designed to receive the refrigerant charge
during a pumpdown procedure, it shall have the capacity to Answer:
Receive the pumpdown charge
●● How are refrigerant blends classified? Answer: Based on worst case
fractionation
●● Emergency shutdown procedures, including precautions to be
observed in case of a breakdown or leak over 55 lbs of refrigerant
charge, shall be displayed on a conspicuous card located as near as
possible to the Answer: Compressor
●● _____ and its alloys are suitable for use with ammonia systems
Answer: Aluminium
●● How many gallons of water do you need per pound of ammonia?
Answer: 1
●● Liquid level gauges must be provided with what? Answer: Automatic
shutoff valves
●● The rupture disc on a low-pressure chiller typically releases pressure
at Answer: 15 Psi
FINAL STUDY PAPER 2026 QUESTIONS
WITH ANSWERS GRADED A+
●● If a low-pressure chiller has a low-side leak, which of the following
will most likely result? Answer: High suction pressure and High
discharge pressure
●● A pressure vessel having an inside diameter of 6" or less shall be
sufficient to withstand ____times the pressure of the saturation
temperature of the refrigerant or ____times the critical pressure of the
refrigerant, whichever is less Answer: 2.5, 2.5
●● Oils, classified as to source, are Answer: Animal, vegitabal, mineral
●● Low pressure systems have what kind of compressor? Answer:
Centrifugal
●● What will occur if the strong solution in an absorption chiller
becomes too strong? Answer: Machine will stop cooling and the solution
will crystalize
, ●● If a liquid receiver is designed to receive the refrigerant charge
during a pumpdown procedure, it shall have the capacity to Answer:
Receive the pumpdown charge
●● How are refrigerant blends classified? Answer: Based on worst case
fractionation
●● Emergency shutdown procedures, including precautions to be
observed in case of a breakdown or leak over 55 lbs of refrigerant
charge, shall be displayed on a conspicuous card located as near as
possible to the Answer: Compressor
●● _____ and its alloys are suitable for use with ammonia systems
Answer: Aluminium
●● How many gallons of water do you need per pound of ammonia?
Answer: 1
●● Liquid level gauges must be provided with what? Answer: Automatic
shutoff valves
●● The rupture disc on a low-pressure chiller typically releases pressure
at Answer: 15 Psi
