Oklahoma Refrigeration Journeyman
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
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1. Which component in a vapor-compression refrigeration system is
primarily responsible for rejecting heat absorbed from the
refrigerated space and heat added by the compressor to the
surrounding environment?
A. Evaporator
B. Expansion device
C. Condenser
D. Accumulator
The condenser rejects heat from the high-pressure refrigerant vapor,
causing the refrigerant to condense into a high-pressure liquid.
2. In a basic refrigeration cycle, what is the primary function of the
evaporator?
,A. Increase refrigerant pressure
B. Absorb heat from the refrigerated space or product
C. Reject heat to the outdoor environment
D. Separate oil from refrigerant
The evaporator absorbs heat as low-pressure refrigerant evaporates,
thereby producing the desired refrigeration effect.
3. What occurs to the pressure of the refrigerant as it passes through
a typical thermostatic expansion valve?
A. It increases substantially
B. It remains constant
C. It decreases substantially
D. It increases and then remains constant
The expansion valve meters liquid refrigerant into the evaporator while
producing a significant pressure drop between the high- and low-
pressure sides.
4. A refrigeration compressor receives refrigerant primarily in which
state during normal operation?
A. High-pressure liquid
B. Low-pressure liquid
C. High-pressure vapor
D. Low-pressure vapor
,The compressor is designed to receive low-pressure vapor and raise its
pressure and temperature before discharge to the condenser.
5. What is the principal purpose of superheating refrigerant vapor at
the evaporator outlet?
A. To guarantee liquid enters the compressor
B. To lower condensing pressure
C. To help prevent liquid refrigerant from entering the compressor
D. To increase liquid subcooling
Superheating ensures that refrigerant leaving the evaporator is vapor
rather than a liquid-vapor mixture, helping protect the compressor from
liquid floodback.
6. What does subcooling indicate in a refrigeration system?
A. The amount of vapor above the saturation temperature
B. The temperature difference between compressor discharge and
suction
C. The amount by which liquid refrigerant temperature is below its
saturation temperature at a given pressure
D. The pressure difference across the compressor
Subcooling describes liquid refrigerant cooled below its saturation
temperature at the corresponding pressure.
7. Which instrument is most appropriate for measuring refrigerant
pressure during system diagnosis?
, A. Clamp-on ammeter
B. Megohmmeter
C. Pressure gauge or manifold gauge set
D. Thermocouple only
Refrigeration pressure is normally measured using appropriately rated
pressure gauges or a manifold gauge set.
8. If the evaporator pressure decreases while the evaporator
temperature also decreases, which relationship is being
demonstrated?
A. Electrical resistance law
B. Pressure-temperature relationship of the refrigerant
C. Boyle's law only for solids
D. Motor torque relationship
For a given refrigerant, saturation temperature and saturation pressure
are directly related, so a reduction in saturation pressure corresponds to
a lower saturation temperature.
9. What is the principal function of a filter-drier installed in a
refrigeration liquid line?
A. Increase compressor displacement
B. Remove moisture and filter contaminants from the refrigerant circuit
C. Increase evaporator pressure
D. Convert vapor directly into liquid
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. Which component in a vapor-compression refrigeration system is
primarily responsible for rejecting heat absorbed from the
refrigerated space and heat added by the compressor to the
surrounding environment?
A. Evaporator
B. Expansion device
C. Condenser
D. Accumulator
The condenser rejects heat from the high-pressure refrigerant vapor,
causing the refrigerant to condense into a high-pressure liquid.
2. In a basic refrigeration cycle, what is the primary function of the
evaporator?
,A. Increase refrigerant pressure
B. Absorb heat from the refrigerated space or product
C. Reject heat to the outdoor environment
D. Separate oil from refrigerant
The evaporator absorbs heat as low-pressure refrigerant evaporates,
thereby producing the desired refrigeration effect.
3. What occurs to the pressure of the refrigerant as it passes through
a typical thermostatic expansion valve?
A. It increases substantially
B. It remains constant
C. It decreases substantially
D. It increases and then remains constant
The expansion valve meters liquid refrigerant into the evaporator while
producing a significant pressure drop between the high- and low-
pressure sides.
4. A refrigeration compressor receives refrigerant primarily in which
state during normal operation?
A. High-pressure liquid
B. Low-pressure liquid
C. High-pressure vapor
D. Low-pressure vapor
,The compressor is designed to receive low-pressure vapor and raise its
pressure and temperature before discharge to the condenser.
5. What is the principal purpose of superheating refrigerant vapor at
the evaporator outlet?
A. To guarantee liquid enters the compressor
B. To lower condensing pressure
C. To help prevent liquid refrigerant from entering the compressor
D. To increase liquid subcooling
Superheating ensures that refrigerant leaving the evaporator is vapor
rather than a liquid-vapor mixture, helping protect the compressor from
liquid floodback.
6. What does subcooling indicate in a refrigeration system?
A. The amount of vapor above the saturation temperature
B. The temperature difference between compressor discharge and
suction
C. The amount by which liquid refrigerant temperature is below its
saturation temperature at a given pressure
D. The pressure difference across the compressor
Subcooling describes liquid refrigerant cooled below its saturation
temperature at the corresponding pressure.
7. Which instrument is most appropriate for measuring refrigerant
pressure during system diagnosis?
, A. Clamp-on ammeter
B. Megohmmeter
C. Pressure gauge or manifold gauge set
D. Thermocouple only
Refrigeration pressure is normally measured using appropriately rated
pressure gauges or a manifold gauge set.
8. If the evaporator pressure decreases while the evaporator
temperature also decreases, which relationship is being
demonstrated?
A. Electrical resistance law
B. Pressure-temperature relationship of the refrigerant
C. Boyle's law only for solids
D. Motor torque relationship
For a given refrigerant, saturation temperature and saturation pressure
are directly related, so a reduction in saturation pressure corresponds to
a lower saturation temperature.
9. What is the principal function of a filter-drier installed in a
refrigeration liquid line?
A. Increase compressor displacement
B. Remove moisture and filter contaminants from the refrigerant circuit
C. Increase evaporator pressure
D. Convert vapor directly into liquid
