South Carolina Chiller Plant Operator
Certification License Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following best describes the primary purpose of a chiller
in an industrial plant?
A. To heat process water for distribution
B. To remove heat from a liquid via a refrigeration cycle
C. To pressurize gases for pneumatic systems
D. To burn fuel for steam generation
Rationale: A chiller’s primary function is to remove heat from a liquid
and transfer it elsewhere using a refrigeration cycle.
2. What is the typical refrigerant found in modern industrial
water-chillers that has minimal ozone depletion potential (ODP)?
A. R-22
B. R-134a
C. R-12
D. R-502
Rationale: R-134a has no ozone depletion potential and is widely
used in industrial chillers, replacing older HCFCs.
,3. In a basic vapor-compression chiller, which component increases the
refrigerant’s pressure and temperature?
A. Expansion valve
B. Evaporator
C. Compressor
D. Condenser
Rationale: The compressor raises the refrigerant’s pressure and
temperature for subsequent heat rejection in the condenser.
4. What is the primary function of the condenser in a refrigeration
system?
A. To evaporate refrigerant at low pressure
B. To reject heat from the refrigerant to another medium
C. To compress gas into a liquid
D. To regulate refrigerant flow
Rationale: The condenser’s role is to release heat taken up by the
refrigerant to the ambient or cooling medium.
5. Which sensor reading is most critical for determining chiller load?
A. Oil pressure
B. Return chilled water temperature
C. Suction gas temperature
D. Compressor discharge pressure
Rationale: Return chilled water temperature indicates the heat being
absorbed by the chiller and thus the system load.
6. An evaporator in a chiller operates at:
A. High pressure and high temperature
B. High pressure and low temperature
C. Low pressure and low temperature
D. Low pressure and high temperature
, Rationale: The evaporator absorbs heat at a lower pressure and
temperature compared to other system components.
7. What is the most common reason for high condenser pressure in a
chiller system?
A. Low ambient temperature
B. Refrigerant undercharge
C. Excessive superheat
D. Dirty condenser tubes
Rationale: Dirty condenser tubes reduce heat rejection capability and
raise condenser pressure.
8. A chiller’s economizer is primarily used to:
A. Increase compressor wear
B. Heat chilled water
C. Regulate oil flow
D. Improve system efficiency by subcooling refrigerant
Rationale: An economizer improves efficiency by subcooling
refrigerant before expansion.
9. What type of heat exchanger is typically used as an evaporator in large
commercial chillers?
A. Air-cooled coil
B. Shell-and-tube
C. Plate heat exchanger
D. Shell-and-tube flooded
Rationale: Large chillers usually use flooded shell-and-tube
evaporators for efficiency.
10. Superheat is the:
A. Temperature difference between condenser and evaporator
B. Amount of liquid refrigerant in the suction line
C. Temperature rise above refrigerant saturation in the evaporator
Certification License Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following best describes the primary purpose of a chiller
in an industrial plant?
A. To heat process water for distribution
B. To remove heat from a liquid via a refrigeration cycle
C. To pressurize gases for pneumatic systems
D. To burn fuel for steam generation
Rationale: A chiller’s primary function is to remove heat from a liquid
and transfer it elsewhere using a refrigeration cycle.
2. What is the typical refrigerant found in modern industrial
water-chillers that has minimal ozone depletion potential (ODP)?
A. R-22
B. R-134a
C. R-12
D. R-502
Rationale: R-134a has no ozone depletion potential and is widely
used in industrial chillers, replacing older HCFCs.
,3. In a basic vapor-compression chiller, which component increases the
refrigerant’s pressure and temperature?
A. Expansion valve
B. Evaporator
C. Compressor
D. Condenser
Rationale: The compressor raises the refrigerant’s pressure and
temperature for subsequent heat rejection in the condenser.
4. What is the primary function of the condenser in a refrigeration
system?
A. To evaporate refrigerant at low pressure
B. To reject heat from the refrigerant to another medium
C. To compress gas into a liquid
D. To regulate refrigerant flow
Rationale: The condenser’s role is to release heat taken up by the
refrigerant to the ambient or cooling medium.
5. Which sensor reading is most critical for determining chiller load?
A. Oil pressure
B. Return chilled water temperature
C. Suction gas temperature
D. Compressor discharge pressure
Rationale: Return chilled water temperature indicates the heat being
absorbed by the chiller and thus the system load.
6. An evaporator in a chiller operates at:
A. High pressure and high temperature
B. High pressure and low temperature
C. Low pressure and low temperature
D. Low pressure and high temperature
, Rationale: The evaporator absorbs heat at a lower pressure and
temperature compared to other system components.
7. What is the most common reason for high condenser pressure in a
chiller system?
A. Low ambient temperature
B. Refrigerant undercharge
C. Excessive superheat
D. Dirty condenser tubes
Rationale: Dirty condenser tubes reduce heat rejection capability and
raise condenser pressure.
8. A chiller’s economizer is primarily used to:
A. Increase compressor wear
B. Heat chilled water
C. Regulate oil flow
D. Improve system efficiency by subcooling refrigerant
Rationale: An economizer improves efficiency by subcooling
refrigerant before expansion.
9. What type of heat exchanger is typically used as an evaporator in large
commercial chillers?
A. Air-cooled coil
B. Shell-and-tube
C. Plate heat exchanger
D. Shell-and-tube flooded
Rationale: Large chillers usually use flooded shell-and-tube
evaporators for efficiency.
10. Superheat is the:
A. Temperature difference between condenser and evaporator
B. Amount of liquid refrigerant in the suction line
C. Temperature rise above refrigerant saturation in the evaporator
