Oklahoma Refrigeration Contractor
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. Which statement most accurately describes the scope of an
Oklahoma Refrigeration Contractor license under the Oklahoma
Construction Industries Board’s mechanical licensing framework?
A. It authorizes only residential refrigeration equipment under 25 tons
and excludes process piping.
B. It authorizes installation of heating equipment but excludes
commercial refrigeration systems.
C. It authorizes the installation, alteration, modification, service,
maintenance, and repair of refrigeration products, systems, and
equipment, including associated process piping.
D. It authorizes only the electrical wiring associated with refrigeration
equipment.
Rationale: The Oklahoma Refrigeration Contractor category specifically
covers refrigeration products, systems, and equipment and includes the
,associated process piping. It is distinct from broader HVAC/R categories
that also encompass heating or sheet-metal work.
2. A refrigeration contractor is evaluating a project involving a
commercial walk-in freezer, condensing unit, evaporator,
refrigerant piping, controls, and associated process piping. Which
consideration most directly determines whether the work falls
within the refrigeration contractor category?
A. Whether the freezer is located inside a single-family dwelling.
B. Whether the equipment uses a belt-driven fan.
C. Whether the work involves refrigeration products, systems,
equipment, and associated process piping.
D. Whether the system operates below atmospheric pressure.
Rationale: Refrigeration licensing is centered on the installation,
alteration, service, maintenance, and repair of refrigeration systems
and associated process piping rather than on a particular drive
arrangement or operating pressure.
3. During a refrigeration installation, the contractor must determine
the correct design evaporating temperature for a frozen-food
application. Which condition generally requires a lower evaporating
temperature than a medium-temperature cooler?
A. Storage of fresh vegetables.
B. Storage of dairy products above freezing.
C. Air conditioning of an office.
,D. Long-term storage of frozen foods requiring substantially subfreezing
conditions.
Rationale: Frozen-food applications generally require evaporating
temperatures substantially below those used for medium-temperature
refrigeration because the stored products must remain frozen.
4. A refrigeration system has a compressor suction pressure
corresponding to a saturated suction temperature of 20°F, while
the evaporator outlet temperature is measured at 30°F. What is the
approximate evaporator outlet superheat?
A. 5°F
B. 10°F
C. 20°F
D. 50°F
Rationale: Superheat is calculated as the actual refrigerant temperature
at the measurement point minus the saturation temperature
corresponding to the pressure. Here, 30°F − 20°F = 10°F.
5. A technician measures 100°F liquid temperature leaving the
condenser while the pressure corresponds to a 110°F saturation
temperature. What is the approximate liquid-line subcooling?
A. 0°F
B. 5°F
, C. 10°F
D. 20°F
Rationale: Subcooling is the saturation temperature corresponding to
the liquid pressure minus the actual liquid temperature. Thus, 110°F −
100°F = 10°F.
6. Why is adequate evaporator superheat important in a refrigeration
system?
A. It ensures liquid refrigerant continuously enters the compressor
cylinder.
B. It guarantees maximum condenser pressure.
C. It helps prevent liquid refrigerant from returning to and damaging the
compressor.
D. It eliminates the need for a metering device.
Rationale: Refrigeration compressors are designed primarily to
compress vapor. Excessive liquid return can cause mechanical damage,
oil dilution, and other forms of compressor failure, making appropriate
superheat control essential.
7. What is the principal function of a thermostatic expansion valve
(TXV) in a conventional refrigeration system?
A. To maintain constant condenser temperature by cycling the condenser
fan.
B. To increase refrigerant pressure before entering the condenser.
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. Which statement most accurately describes the scope of an
Oklahoma Refrigeration Contractor license under the Oklahoma
Construction Industries Board’s mechanical licensing framework?
A. It authorizes only residential refrigeration equipment under 25 tons
and excludes process piping.
B. It authorizes installation of heating equipment but excludes
commercial refrigeration systems.
C. It authorizes the installation, alteration, modification, service,
maintenance, and repair of refrigeration products, systems, and
equipment, including associated process piping.
D. It authorizes only the electrical wiring associated with refrigeration
equipment.
Rationale: The Oklahoma Refrigeration Contractor category specifically
covers refrigeration products, systems, and equipment and includes the
,associated process piping. It is distinct from broader HVAC/R categories
that also encompass heating or sheet-metal work.
2. A refrigeration contractor is evaluating a project involving a
commercial walk-in freezer, condensing unit, evaporator,
refrigerant piping, controls, and associated process piping. Which
consideration most directly determines whether the work falls
within the refrigeration contractor category?
A. Whether the freezer is located inside a single-family dwelling.
B. Whether the equipment uses a belt-driven fan.
C. Whether the work involves refrigeration products, systems,
equipment, and associated process piping.
D. Whether the system operates below atmospheric pressure.
Rationale: Refrigeration licensing is centered on the installation,
alteration, service, maintenance, and repair of refrigeration systems
and associated process piping rather than on a particular drive
arrangement or operating pressure.
3. During a refrigeration installation, the contractor must determine
the correct design evaporating temperature for a frozen-food
application. Which condition generally requires a lower evaporating
temperature than a medium-temperature cooler?
A. Storage of fresh vegetables.
B. Storage of dairy products above freezing.
C. Air conditioning of an office.
,D. Long-term storage of frozen foods requiring substantially subfreezing
conditions.
Rationale: Frozen-food applications generally require evaporating
temperatures substantially below those used for medium-temperature
refrigeration because the stored products must remain frozen.
4. A refrigeration system has a compressor suction pressure
corresponding to a saturated suction temperature of 20°F, while
the evaporator outlet temperature is measured at 30°F. What is the
approximate evaporator outlet superheat?
A. 5°F
B. 10°F
C. 20°F
D. 50°F
Rationale: Superheat is calculated as the actual refrigerant temperature
at the measurement point minus the saturation temperature
corresponding to the pressure. Here, 30°F − 20°F = 10°F.
5. A technician measures 100°F liquid temperature leaving the
condenser while the pressure corresponds to a 110°F saturation
temperature. What is the approximate liquid-line subcooling?
A. 0°F
B. 5°F
, C. 10°F
D. 20°F
Rationale: Subcooling is the saturation temperature corresponding to
the liquid pressure minus the actual liquid temperature. Thus, 110°F −
100°F = 10°F.
6. Why is adequate evaporator superheat important in a refrigeration
system?
A. It ensures liquid refrigerant continuously enters the compressor
cylinder.
B. It guarantees maximum condenser pressure.
C. It helps prevent liquid refrigerant from returning to and damaging the
compressor.
D. It eliminates the need for a metering device.
Rationale: Refrigeration compressors are designed primarily to
compress vapor. Excessive liquid return can cause mechanical damage,
oil dilution, and other forms of compressor failure, making appropriate
superheat control essential.
7. What is the principal function of a thermostatic expansion valve
(TXV) in a conventional refrigeration system?
A. To maintain constant condenser temperature by cycling the condenser
fan.
B. To increase refrigerant pressure before entering the condenser.
