Oklahoma Refrigeration Contractor
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
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1. A refrigeration contractor is preparing to install a commercial
refrigeration system in Oklahoma. Which activity is most directly
within the scope of a Refrigeration Contractor license?
A. Installing residential electrical service equipment
B. Installing, altering, servicing, maintaining, or repairing refrigeration
systems and their process piping
C. Installing domestic water distribution systems only
D. Installing structural steel for a commercial building
B. Installing, altering, servicing, maintaining, or repairing refrigeration
systems and their process piping
The Oklahoma Refrigeration Contractor license covers the installation,
alteration, modification, service, maintenance, and repair of
,refrigeration products, systems, equipment, and associated process
piping.
2. A refrigeration compressor is rated for a particular voltage and
frequency. Which condition is most likely to cause excessive motor
current if the motor is otherwise operating normally?
A. Correct supply voltage at the rated frequency
B. Supply voltage substantially below the motor's rated voltage
C. Properly sized conductors with minimal voltage drop
D. Correct phase sequence on a three-phase motor
B. Supply voltage substantially below the motor's rated voltage
Undervoltage can cause a motor to draw increased current while
attempting to produce the required torque, potentially causing
overheating and motor damage.
3. A technician measures voltage across an energized refrigeration
contactor coil and obtains the rated control voltage. However, the
contactor does not pull in. Which condition should be investigated
first?
A. Open or defective contactor coil
B. Low refrigerant charge
C. Dirty condenser coil
D. Restricted liquid-line filter-drier
A. Open or defective contactor coil
,If the correct voltage is present directly across the coil and the contactor
does not energize, the coil itself or its mechanical assembly is a primary
suspect.
4. In a basic vapor-compression refrigeration cycle, what is the
principal function of the compressor?
A. Convert liquid refrigerant into vapor at the evaporator outlet
B. Reduce refrigerant pressure before the evaporator
C. Raise the pressure and temperature of refrigerant vapor and circulate
it through the system
D. Remove moisture from the refrigerant
C. Raise the pressure and temperature of refrigerant vapor and circulate
it through the system
The compressor receives low-pressure vapor from the evaporator and
compresses it into high-pressure, higher-temperature vapor before
discharge to the condenser.
5. Which component normally removes heat from the refrigerated
space?
A. Condenser
B. Evaporator
C. Receiver
D. Compressor
B. Evaporator
, The evaporator absorbs heat from the refrigerated space or product as
liquid refrigerant changes phase and evaporates within the coil.
6. What is the primary function of a condenser in a vapor-compression
refrigeration system?
A. Absorb heat from the refrigerated space
B. Increase refrigerant superheat before compression
C. Reject heat from the refrigerant to the surrounding medium
D. Meter liquid refrigerant into the evaporator
C. Reject heat from the refrigerant to the surrounding medium
The condenser removes heat absorbed in the evaporator plus the
compressor's heat of compression, causing high-pressure refrigerant
vapor to condense into liquid.
7. Which refrigeration component is specifically designed to meter
refrigerant into an evaporator while producing a pressure drop?
A. Receiver
B. Expansion device
C. Accumulator
D. Discharge muffler
B. Expansion device
An expansion device controls refrigerant flow into the evaporator and
creates the pressure reduction required for low-pressure evaporation.
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. A refrigeration contractor is preparing to install a commercial
refrigeration system in Oklahoma. Which activity is most directly
within the scope of a Refrigeration Contractor license?
A. Installing residential electrical service equipment
B. Installing, altering, servicing, maintaining, or repairing refrigeration
systems and their process piping
C. Installing domestic water distribution systems only
D. Installing structural steel for a commercial building
B. Installing, altering, servicing, maintaining, or repairing refrigeration
systems and their process piping
The Oklahoma Refrigeration Contractor license covers the installation,
alteration, modification, service, maintenance, and repair of
,refrigeration products, systems, equipment, and associated process
piping.
2. A refrigeration compressor is rated for a particular voltage and
frequency. Which condition is most likely to cause excessive motor
current if the motor is otherwise operating normally?
A. Correct supply voltage at the rated frequency
B. Supply voltage substantially below the motor's rated voltage
C. Properly sized conductors with minimal voltage drop
D. Correct phase sequence on a three-phase motor
B. Supply voltage substantially below the motor's rated voltage
Undervoltage can cause a motor to draw increased current while
attempting to produce the required torque, potentially causing
overheating and motor damage.
3. A technician measures voltage across an energized refrigeration
contactor coil and obtains the rated control voltage. However, the
contactor does not pull in. Which condition should be investigated
first?
A. Open or defective contactor coil
B. Low refrigerant charge
C. Dirty condenser coil
D. Restricted liquid-line filter-drier
A. Open or defective contactor coil
,If the correct voltage is present directly across the coil and the contactor
does not energize, the coil itself or its mechanical assembly is a primary
suspect.
4. In a basic vapor-compression refrigeration cycle, what is the
principal function of the compressor?
A. Convert liquid refrigerant into vapor at the evaporator outlet
B. Reduce refrigerant pressure before the evaporator
C. Raise the pressure and temperature of refrigerant vapor and circulate
it through the system
D. Remove moisture from the refrigerant
C. Raise the pressure and temperature of refrigerant vapor and circulate
it through the system
The compressor receives low-pressure vapor from the evaporator and
compresses it into high-pressure, higher-temperature vapor before
discharge to the condenser.
5. Which component normally removes heat from the refrigerated
space?
A. Condenser
B. Evaporator
C. Receiver
D. Compressor
B. Evaporator
, The evaporator absorbs heat from the refrigerated space or product as
liquid refrigerant changes phase and evaporates within the coil.
6. What is the primary function of a condenser in a vapor-compression
refrigeration system?
A. Absorb heat from the refrigerated space
B. Increase refrigerant superheat before compression
C. Reject heat from the refrigerant to the surrounding medium
D. Meter liquid refrigerant into the evaporator
C. Reject heat from the refrigerant to the surrounding medium
The condenser removes heat absorbed in the evaporator plus the
compressor's heat of compression, causing high-pressure refrigerant
vapor to condense into liquid.
7. Which refrigeration component is specifically designed to meter
refrigerant into an evaporator while producing a pressure drop?
A. Receiver
B. Expansion device
C. Accumulator
D. Discharge muffler
B. Expansion device
An expansion device controls refrigerant flow into the evaporator and
creates the pressure reduction required for low-pressure evaporation.
