FDNY Z-52 Industrial Cooling Systems
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1.
An industrial cooling system shows rising condenser pressure during peak
operation. What is the MOST likely cause?
A. Low refrigerant charge
B. Restricted condenser airflow or fouled condenser
C. Low ambient temperature
D. Oversized evaporator
Answer: B
Rationale: Poor heat rejection increases condensing pressure.
2.
A technician observes ice buildup on the suction line near the evaporator. MOST
likely cause?
A. Overheated compressor
B. Low airflow across evaporator or refrigerant flooding
C. Clean evaporator coil
D. High ambient temperature
Answer: B
Rationale: Reduced heat absorption causes excessive refrigerant cooling and ice
formation.
,3.
In an industrial ammonia cooling system, a strong odor is detected near valve
stations. FIRST required action?
A. Continue operations
B. Tighten fittings immediately
C. Evacuate area and activate emergency leak procedures
D. Reduce condenser airflow
Answer: C
Rationale: Ammonia exposure is hazardous and requires immediate emergency
response.
4.
A cooling tower fan motor fails during full-load operation. MOST immediate
consequence?
A. Reduced head pressure
B. Increased condenser water temperature
C. Increased evaporator efficiency
D. Lower discharge pressure
Answer: B
Rationale: Cooling towers reject heat; fan failure reduces heat removal efficiency.
5.
What is the PRIMARY function of a cooling tower in industrial systems?
A. Compress refrigerant
B. Reject heat to atmosphere
C. Increase refrigerant pressure
D. Store chilled water
,Answer: B
Rationale: Cooling towers dissipate heat from condenser water systems.
6.
A centrifugal chiller experiences surge conditions repeatedly. MOST likely cause?
A. Stable load conditions
B. Low evaporator load or improper flow conditions
C. High chilled water demand
D. Clean condenser tubes
Answer: B
Rationale: Surge occurs when compressor flow becomes unstable under low-load
conditions.
7.
A chilled water system shows low differential temperature between supply and
return. MOST likely cause?
A. Efficient heat transfer
B. Excessive water flow or poor heat exchange
C. High condenser pressure
D. Low refrigerant pressure only
Answer: B
Rationale: Low ΔT indicates insufficient heat absorption or excessive flow rate.
8.
A refrigeration compressor draws excessive amperage under normal load. MOST
likely cause?
A. Low head pressure
B. High discharge pressure
, C. Low refrigerant charge
D. Clean condenser coil
Answer: B
Rationale: High discharge pressure increases compressor workload and current
draw.
9.
What is the purpose of a purge unit in low-pressure chillers?
A. Increase cooling capacity
B. Remove non-condensable gases
C. Raise suction pressure
D. Improve lubrication
Answer: B
Rationale: Non-condensables reduce efficiency and increase pressure.
10.
An industrial evaporator coil shows uneven frost patterns. MOST likely cause?
A. Balanced refrigerant distribution
B. Refrigerant starvation or airflow restriction
C. High ambient temperature
D. Proper operation
Answer: B
Rationale: Uneven frosting indicates inconsistent heat exchange.
11.
A system shows high compressor discharge temperature. MOST likely cause?
A. High suction pressure
B. Low suction pressure
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1.
An industrial cooling system shows rising condenser pressure during peak
operation. What is the MOST likely cause?
A. Low refrigerant charge
B. Restricted condenser airflow or fouled condenser
C. Low ambient temperature
D. Oversized evaporator
Answer: B
Rationale: Poor heat rejection increases condensing pressure.
2.
A technician observes ice buildup on the suction line near the evaporator. MOST
likely cause?
A. Overheated compressor
B. Low airflow across evaporator or refrigerant flooding
C. Clean evaporator coil
D. High ambient temperature
Answer: B
Rationale: Reduced heat absorption causes excessive refrigerant cooling and ice
formation.
,3.
In an industrial ammonia cooling system, a strong odor is detected near valve
stations. FIRST required action?
A. Continue operations
B. Tighten fittings immediately
C. Evacuate area and activate emergency leak procedures
D. Reduce condenser airflow
Answer: C
Rationale: Ammonia exposure is hazardous and requires immediate emergency
response.
4.
A cooling tower fan motor fails during full-load operation. MOST immediate
consequence?
A. Reduced head pressure
B. Increased condenser water temperature
C. Increased evaporator efficiency
D. Lower discharge pressure
Answer: B
Rationale: Cooling towers reject heat; fan failure reduces heat removal efficiency.
5.
What is the PRIMARY function of a cooling tower in industrial systems?
A. Compress refrigerant
B. Reject heat to atmosphere
C. Increase refrigerant pressure
D. Store chilled water
,Answer: B
Rationale: Cooling towers dissipate heat from condenser water systems.
6.
A centrifugal chiller experiences surge conditions repeatedly. MOST likely cause?
A. Stable load conditions
B. Low evaporator load or improper flow conditions
C. High chilled water demand
D. Clean condenser tubes
Answer: B
Rationale: Surge occurs when compressor flow becomes unstable under low-load
conditions.
7.
A chilled water system shows low differential temperature between supply and
return. MOST likely cause?
A. Efficient heat transfer
B. Excessive water flow or poor heat exchange
C. High condenser pressure
D. Low refrigerant pressure only
Answer: B
Rationale: Low ΔT indicates insufficient heat absorption or excessive flow rate.
8.
A refrigeration compressor draws excessive amperage under normal load. MOST
likely cause?
A. Low head pressure
B. High discharge pressure
, C. Low refrigerant charge
D. Clean condenser coil
Answer: B
Rationale: High discharge pressure increases compressor workload and current
draw.
9.
What is the purpose of a purge unit in low-pressure chillers?
A. Increase cooling capacity
B. Remove non-condensable gases
C. Raise suction pressure
D. Improve lubrication
Answer: B
Rationale: Non-condensables reduce efficiency and increase pressure.
10.
An industrial evaporator coil shows uneven frost patterns. MOST likely cause?
A. Balanced refrigerant distribution
B. Refrigerant starvation or airflow restriction
C. High ambient temperature
D. Proper operation
Answer: B
Rationale: Uneven frosting indicates inconsistent heat exchange.
11.
A system shows high compressor discharge temperature. MOST likely cause?
A. High suction pressure
B. Low suction pressure
