Refrigeration Tests 1 & 2 Questions and Answers 2026
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1. In a refrigeration system, if the air is cooled from 95°F to 75°F while the
relative humidity decreases from 50% to 40%, what type of process is
occurring?
Latent heat removal
Constant humidity cooling
Dehumidification
Sensible cooling
2. What property of an air mixture remains unchanged if the dew point is
constant?
Pressure
Enthalpy
Humidity ratio
Temperature
3. If the dry bulb temperature in a closed cargo hold drops to 70°F, what would
you expect the relative humidity to be, assuming no moisture is added or
removed?
Relative humidity will drop to 50%.
Relative humidity will decrease below 80%.
Relative humidity will remain at 80%.
Relative humidity will increase above 80%.
,4. If a technician discovers that the safety heads of a large reciprocating
compressor are not properly secured, what potential risks could arise during
operation?
Increased risk of compressor failure or explosion.
Improved energy efficiency.
Enhanced cooling performance.
Reduced maintenance costs.
5. A liquid line to a suction line heat interexchanger in a refrigeration system
using a reciprocating compressor serves what function?
cool the suction vapor returning to the compressor
raise the temperature of liquid refrigerant
reduce the possibility of liquid refrigerant slugging the compressor
raise the refrigerant saturation temperature in the evaporator
6. Describe the fundamental principle of heat transfer in thermodynamics.
Heat transfer is not influenced by the medium.
Heat transfer occurs from areas of higher temperature to areas of
lower temperature.
Heat transfer is only possible in gases.
Heat transfer can occur in any direction regardless of temperature.
7. Foaming at start-up may be found in what component? What does this mean?
Refrigerant in an accumulator foams on a low pressure.
Refrigerant in the condenser will foam on hot days
, Refrigerant in the compressor oil will cause oil foaming. Prevent
refrigerant migration with a crankcase heater
Refrigerant in the receiver foams with high pressure
8. In a refrigeration system using a zeotropic refrigerant, how would the
system's performance be affected if the refrigerant experiences significant
fractionation?
The system will become more reliable and easier to maintain.
The system will operate at optimal efficiency without any changes.
The system will require less energy to operate effectively.
The system may experience reduced efficiency and altered cooling
capacity.
9. In a multi-evaporator refrigeration system, a solenoid valve is installed in the
liquid line before _ _.
the oil separator
each expansion valve
the receiver
the condenser
10. Describe the purpose of the water failure switch in a water-cooled
refrigeration system.
The water failure switch increases the pressure in the system.
The water failure switch regulates the temperature of the refrigerant.
The water failure switch controls the humidity levels in the system.
The water failure switch is designed to protect the system from
damage by shutting it down when there is insufficient cooling water
, pressure.
11. Describe the role of a compressor overload protector in a refrigeration
system.
The compressor overload protector controls the humidity levels in the
system.
The compressor overload protector measures the temperature of the
refrigerant.
The compressor overload protector stops the compressor to
prevent damage from excessive pressure or temperature.
The compressor overload protector regulates the flow of refrigerant
through the system.
12. What term describes refrigerants that undergo fractionation during state
changes?
Isotropic
Azeotropic
Non-azeotropic
Zeotropic
13. In an air conditioning and refrigeration system, what occurs in an
evaporator?
The refrigerant absorbs the latent heat
Latent heat is condensed
The refrigerant evaporates latent heat
Latent heat is released
100% Guarantee Pass
1. In a refrigeration system, if the air is cooled from 95°F to 75°F while the
relative humidity decreases from 50% to 40%, what type of process is
occurring?
Latent heat removal
Constant humidity cooling
Dehumidification
Sensible cooling
2. What property of an air mixture remains unchanged if the dew point is
constant?
Pressure
Enthalpy
Humidity ratio
Temperature
3. If the dry bulb temperature in a closed cargo hold drops to 70°F, what would
you expect the relative humidity to be, assuming no moisture is added or
removed?
Relative humidity will drop to 50%.
Relative humidity will decrease below 80%.
Relative humidity will remain at 80%.
Relative humidity will increase above 80%.
,4. If a technician discovers that the safety heads of a large reciprocating
compressor are not properly secured, what potential risks could arise during
operation?
Increased risk of compressor failure or explosion.
Improved energy efficiency.
Enhanced cooling performance.
Reduced maintenance costs.
5. A liquid line to a suction line heat interexchanger in a refrigeration system
using a reciprocating compressor serves what function?
cool the suction vapor returning to the compressor
raise the temperature of liquid refrigerant
reduce the possibility of liquid refrigerant slugging the compressor
raise the refrigerant saturation temperature in the evaporator
6. Describe the fundamental principle of heat transfer in thermodynamics.
Heat transfer is not influenced by the medium.
Heat transfer occurs from areas of higher temperature to areas of
lower temperature.
Heat transfer is only possible in gases.
Heat transfer can occur in any direction regardless of temperature.
7. Foaming at start-up may be found in what component? What does this mean?
Refrigerant in an accumulator foams on a low pressure.
Refrigerant in the condenser will foam on hot days
, Refrigerant in the compressor oil will cause oil foaming. Prevent
refrigerant migration with a crankcase heater
Refrigerant in the receiver foams with high pressure
8. In a refrigeration system using a zeotropic refrigerant, how would the
system's performance be affected if the refrigerant experiences significant
fractionation?
The system will become more reliable and easier to maintain.
The system will operate at optimal efficiency without any changes.
The system will require less energy to operate effectively.
The system may experience reduced efficiency and altered cooling
capacity.
9. In a multi-evaporator refrigeration system, a solenoid valve is installed in the
liquid line before _ _.
the oil separator
each expansion valve
the receiver
the condenser
10. Describe the purpose of the water failure switch in a water-cooled
refrigeration system.
The water failure switch increases the pressure in the system.
The water failure switch regulates the temperature of the refrigerant.
The water failure switch controls the humidity levels in the system.
The water failure switch is designed to protect the system from
damage by shutting it down when there is insufficient cooling water
, pressure.
11. Describe the role of a compressor overload protector in a refrigeration
system.
The compressor overload protector controls the humidity levels in the
system.
The compressor overload protector measures the temperature of the
refrigerant.
The compressor overload protector stops the compressor to
prevent damage from excessive pressure or temperature.
The compressor overload protector regulates the flow of refrigerant
through the system.
12. What term describes refrigerants that undergo fractionation during state
changes?
Isotropic
Azeotropic
Non-azeotropic
Zeotropic
13. In an air conditioning and refrigeration system, what occurs in an
evaporator?
The refrigerant absorbs the latent heat
Latent heat is condensed
The refrigerant evaporates latent heat
Latent heat is released
