NYC Health Hospitals Refrigeration
Engineer Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
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1. A refrigeration engineer is troubleshooting a large centrifugal chiller
serving a hospital facility. The machine is operating with reduced
cooling capacity, and the suction pressure is higher than normal while
the discharge pressure is lower than expected. Which condition is the
most likely cause of this operating problem?
A. Excessive refrigerant undercharge causing evaporator starvation
B. Fouled condenser tubes reducing heat transfer efficiency
C. Excessive evaporator water flow causing low approach temperature
D. Restricted expansion device causing insufficient refrigerant flow
Answer: B
,A fouled condenser reduces the ability of the refrigerant to reject heat,
causing abnormal operating pressures and reduced refrigeration capacity.
Hospital chillers require regular condenser maintenance to maintain
efficiency and reliability.
2. When performing preventive maintenance on a refrigeration
compressor, which measurement provides the most useful indication
of compressor mechanical condition?
A. Compressor paint condition
B. Motor terminal voltage only
C. Suction and discharge pressure relationship with operating temperature
D. Refrigerant cylinder weight
Answer: C
Evaluating suction pressure, discharge pressure, superheat, and operating
temperatures helps determine compressor performance and identify
mechanical or refrigeration system problems.
3. A refrigeration engineer notices frost accumulating on the suction line
of a refrigeration system. What does excessive suction line frosting
commonly indicate?
A. Excessive superheat at the compressor inlet
B. Liquid refrigerant returning to the compressor
C. Insufficient refrigerant charge only
D. A dirty condenser coil only
,Answer: B
Liquid refrigerant returning to the compressor can cause suction line
frosting and may damage compressor valves, bearings, and motor
components due to liquid slugging.
4. In a hospital refrigeration system, why is maintaining proper superheat
at the evaporator outlet important?
A. It increases liquid refrigerant entering the compressor
B. It prevents refrigerant from evaporating in the condenser
C. It ensures only vapor refrigerant enters the compressor
D. It eliminates the need for refrigerant controls
Answer: C
Proper superheat ensures that refrigerant leaving the evaporator is fully
vaporized, protecting the compressor from liquid refrigerant damage.
5. A refrigeration system has abnormally high head pressure during
normal ambient conditions. Which problem should be investigated
first?
A. Low evaporator airflow
B. Dirty condenser surfaces or inadequate condenser airflow
C. Excessive compressor lubrication
D. Low suction pressure caused by underfeeding
Answer: B
, High head pressure is commonly caused by poor condenser heat rejection
due to dirty coils, blocked airflow, or insufficient cooling water flow.
6. Which refrigerant recovery practice is required before opening a
refrigeration system for repairs?
A. Vent refrigerant slowly into the atmosphere
B. Recover refrigerant using approved recovery equipment
C. Add compressed air to remove refrigerant
D. Increase system pressure before draining
Answer: B
Refrigerants must be recovered using approved equipment to prevent
environmental release and comply with refrigeration safety regulations.
7. The primary purpose of an expansion valve in a refrigeration system is
to:
A. Increase compressor discharge pressure
B. Control refrigerant flow into the evaporator
C. Remove oil from the compressor
D. Increase condenser temperature
Answer: B
The expansion valve regulates the amount of refrigerant entering the
evaporator and maintains proper evaporator operation and superheat.
Engineer Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. A refrigeration engineer is troubleshooting a large centrifugal chiller
serving a hospital facility. The machine is operating with reduced
cooling capacity, and the suction pressure is higher than normal while
the discharge pressure is lower than expected. Which condition is the
most likely cause of this operating problem?
A. Excessive refrigerant undercharge causing evaporator starvation
B. Fouled condenser tubes reducing heat transfer efficiency
C. Excessive evaporator water flow causing low approach temperature
D. Restricted expansion device causing insufficient refrigerant flow
Answer: B
,A fouled condenser reduces the ability of the refrigerant to reject heat,
causing abnormal operating pressures and reduced refrigeration capacity.
Hospital chillers require regular condenser maintenance to maintain
efficiency and reliability.
2. When performing preventive maintenance on a refrigeration
compressor, which measurement provides the most useful indication
of compressor mechanical condition?
A. Compressor paint condition
B. Motor terminal voltage only
C. Suction and discharge pressure relationship with operating temperature
D. Refrigerant cylinder weight
Answer: C
Evaluating suction pressure, discharge pressure, superheat, and operating
temperatures helps determine compressor performance and identify
mechanical or refrigeration system problems.
3. A refrigeration engineer notices frost accumulating on the suction line
of a refrigeration system. What does excessive suction line frosting
commonly indicate?
A. Excessive superheat at the compressor inlet
B. Liquid refrigerant returning to the compressor
C. Insufficient refrigerant charge only
D. A dirty condenser coil only
,Answer: B
Liquid refrigerant returning to the compressor can cause suction line
frosting and may damage compressor valves, bearings, and motor
components due to liquid slugging.
4. In a hospital refrigeration system, why is maintaining proper superheat
at the evaporator outlet important?
A. It increases liquid refrigerant entering the compressor
B. It prevents refrigerant from evaporating in the condenser
C. It ensures only vapor refrigerant enters the compressor
D. It eliminates the need for refrigerant controls
Answer: C
Proper superheat ensures that refrigerant leaving the evaporator is fully
vaporized, protecting the compressor from liquid refrigerant damage.
5. A refrigeration system has abnormally high head pressure during
normal ambient conditions. Which problem should be investigated
first?
A. Low evaporator airflow
B. Dirty condenser surfaces or inadequate condenser airflow
C. Excessive compressor lubrication
D. Low suction pressure caused by underfeeding
Answer: B
, High head pressure is commonly caused by poor condenser heat rejection
due to dirty coils, blocked airflow, or insufficient cooling water flow.
6. Which refrigerant recovery practice is required before opening a
refrigeration system for repairs?
A. Vent refrigerant slowly into the atmosphere
B. Recover refrigerant using approved recovery equipment
C. Add compressed air to remove refrigerant
D. Increase system pressure before draining
Answer: B
Refrigerants must be recovered using approved equipment to prevent
environmental release and comply with refrigeration safety regulations.
7. The primary purpose of an expansion valve in a refrigeration system is
to:
A. Increase compressor discharge pressure
B. Control refrigerant flow into the evaporator
C. Remove oil from the compressor
D. Increase condenser temperature
Answer: B
The expansion valve regulates the amount of refrigerant entering the
evaporator and maintains proper evaporator operation and superheat.
