MASSACHUSETTS REFRIGERATION LICENSE EXAM NEWEST
2026 QUESTIONS and CORRECT DETAILED ANSWERS
ALREADY GRADED A+
What is the state of the refrigerant leaving the evaporator? - CORRECT
ANSWER-Low temp superheated vapor
Low temperature systems should have what? - CORRECT ANSWER-Low pour
point
Which of the following most closely represents the concentration of Li-Br in a
absorption system? - CORRECT ANSWER-60% Li-Br / 40% Distilled water
Which refrigerant(s) is an HFC? - CORRECT ANSWER-410A
If the suction pressure is low and the evaporator temperature high, the cause will
be a? - CORRECT ANSWER-Starved evaporator
An accumulator can be located between the - CORRECT ANSWER-Evaporator
and compressor
,What device measures the specific gravity of a substance? - CORRECT
ANSWER-Hydrometer
If a low-pressure chiller has a low-side leak, which of the following will most likely
result? - CORRECT 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 -
CORRECT ANSWER-2.5, 2.5
Oils, classified as to source, are - CORRECT ANSWER-Animal, vegitabal, mineral
Low pressure systems have what kind of compressor? - CORRECT ANSWER-
Centrifugal
What will occur if the strong solution in an absorption chiller becomes too strong?
- CORRECT 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 - CORRECT ANSWER-
Receive the pumpdown charge
How are refrigerant blends classified? - CORRECT 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 - CORRECT ANSWER-
Compressor
_____ and its alloys are suitable for use with ammonia systems - CORRECT
ANSWER-Aluminium
How many gallons of water do you need per pound of ammonia? - CORRECT
ANSWER-1
Liquid level gauges must be provided with what? - CORRECT ANSWER-
Automatic shutoff valves
2026 QUESTIONS and CORRECT DETAILED ANSWERS
ALREADY GRADED A+
What is the state of the refrigerant leaving the evaporator? - CORRECT
ANSWER-Low temp superheated vapor
Low temperature systems should have what? - CORRECT ANSWER-Low pour
point
Which of the following most closely represents the concentration of Li-Br in a
absorption system? - CORRECT ANSWER-60% Li-Br / 40% Distilled water
Which refrigerant(s) is an HFC? - CORRECT ANSWER-410A
If the suction pressure is low and the evaporator temperature high, the cause will
be a? - CORRECT ANSWER-Starved evaporator
An accumulator can be located between the - CORRECT ANSWER-Evaporator
and compressor
,What device measures the specific gravity of a substance? - CORRECT
ANSWER-Hydrometer
If a low-pressure chiller has a low-side leak, which of the following will most likely
result? - CORRECT 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 -
CORRECT ANSWER-2.5, 2.5
Oils, classified as to source, are - CORRECT ANSWER-Animal, vegitabal, mineral
Low pressure systems have what kind of compressor? - CORRECT ANSWER-
Centrifugal
What will occur if the strong solution in an absorption chiller becomes too strong?
- CORRECT 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 - CORRECT ANSWER-
Receive the pumpdown charge
How are refrigerant blends classified? - CORRECT 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 - CORRECT ANSWER-
Compressor
_____ and its alloys are suitable for use with ammonia systems - CORRECT
ANSWER-Aluminium
How many gallons of water do you need per pound of ammonia? - CORRECT
ANSWER-1
Liquid level gauges must be provided with what? - CORRECT ANSWER-
Automatic shutoff valves
