Refrigeration and Refrigerant Exam
UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
1.Name three reasons why ice melts in an icebox _____,_____,_____. - CORRECT
ANSWER Heat raises off hot food being stored, heavier cold air falls out-> warm air
replaces cold air, heat transfer through walls or insulation because of warmer room
temperatures.
2. What are the approximate temperature ranges for low-, medium-, and high-temperature
refrigeration applications? - CORRECT ANSWER Low: -10 -> 10 degrees
Medium: 35 -> 50 degrees
High: 50 -> 60 degrees.
3.One ton of refrigeration is.
A. 1200 Btu.
B. 12,000 Btu/h.
C. 120,000 Btu.
D. 120,000 Btu/h - CORRECT ANSWER B. 12000 btu/hr.
4. Describe briefly the basic refrigeration cycle. - CORRECT ANSWER Indoor heat is
pumped to the indoor coil; system heat flows from the outdoor coil to the outdoor air.
5. What is the relationship between pressure and the boiling point of liquids? - CORRECT
ANSWER They coincide. The lower the pressure the lower the boiling point and vice
versa.
6. What is the function of the evaporator in a refrigeration. - CORRECT
ANSWER absorbs heat . Changes the state of the refrigerant from a liquid to a
vapor/gas. It superheats the vapor.
, 7.What does the compressor do in the refrigeration or air conditioning system. - CORRECT
ANSWER creates Pressure - low to high pressure. The heart of the system. There is no
cycle with no compressor.
8. Define a superheated vapor. - CORRECT ANSWER Sensible heat added above a
liquids boiling point.
9. The evaporating pressure is 76 psig for R-22 and the evaporator outlet temperature is 58 F.
What is the evaporator superheat for this system?
A. 13°F
B. 74°F
C. 18°F
D. 17°F - CORRECT ANSWER A. 13°F
10. If the evaporating pressure was 76 psig for R-22 and the
compressor inlet temperature was 65°F, what would be
the total superheat entering the compressor?
A. 11°F
B. 21°F
C. 10°F
D. 14°F - CORRECT ANSWER D. 20°F
11. Define the term subcooled liquid. - CORRECT ANSWER Sensible heat lost under
boiling point of a liquid.
12. The condensing pressure is 260 psig and the condenser outlet temperature is 108°F for R-
22. By how many degrees is the liquid subcooled in the condenser?
A. 12°F
B. 42°F
C. 7°F
UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
1.Name three reasons why ice melts in an icebox _____,_____,_____. - CORRECT
ANSWER Heat raises off hot food being stored, heavier cold air falls out-> warm air
replaces cold air, heat transfer through walls or insulation because of warmer room
temperatures.
2. What are the approximate temperature ranges for low-, medium-, and high-temperature
refrigeration applications? - CORRECT ANSWER Low: -10 -> 10 degrees
Medium: 35 -> 50 degrees
High: 50 -> 60 degrees.
3.One ton of refrigeration is.
A. 1200 Btu.
B. 12,000 Btu/h.
C. 120,000 Btu.
D. 120,000 Btu/h - CORRECT ANSWER B. 12000 btu/hr.
4. Describe briefly the basic refrigeration cycle. - CORRECT ANSWER Indoor heat is
pumped to the indoor coil; system heat flows from the outdoor coil to the outdoor air.
5. What is the relationship between pressure and the boiling point of liquids? - CORRECT
ANSWER They coincide. The lower the pressure the lower the boiling point and vice
versa.
6. What is the function of the evaporator in a refrigeration. - CORRECT
ANSWER absorbs heat . Changes the state of the refrigerant from a liquid to a
vapor/gas. It superheats the vapor.
, 7.What does the compressor do in the refrigeration or air conditioning system. - CORRECT
ANSWER creates Pressure - low to high pressure. The heart of the system. There is no
cycle with no compressor.
8. Define a superheated vapor. - CORRECT ANSWER Sensible heat added above a
liquids boiling point.
9. The evaporating pressure is 76 psig for R-22 and the evaporator outlet temperature is 58 F.
What is the evaporator superheat for this system?
A. 13°F
B. 74°F
C. 18°F
D. 17°F - CORRECT ANSWER A. 13°F
10. If the evaporating pressure was 76 psig for R-22 and the
compressor inlet temperature was 65°F, what would be
the total superheat entering the compressor?
A. 11°F
B. 21°F
C. 10°F
D. 14°F - CORRECT ANSWER D. 20°F
11. Define the term subcooled liquid. - CORRECT ANSWER Sensible heat lost under
boiling point of a liquid.
12. The condensing pressure is 260 psig and the condenser outlet temperature is 108°F for R-
22. By how many degrees is the liquid subcooled in the condenser?
A. 12°F
B. 42°F
C. 7°F
