FDNY Z-51 / RSOE FUNDAMENTALS
— ACTUAL QUESTIONS AND
VERIFIED ANSWERS|, 2026 NEW
CURRICULUM|NEWEST UPDATE
,Core Domains
Refrigeration Theory and Mathematics
Vapor-Compression Cycle and System Components
Compressors, Condensers, and Evaporators
Refrigerant Metering Devices and Controls
Refrigerant Classifications, Safety, and Handling
Electrical Components and Controls
Plant Operations, Maintenance, and Recordkeeping
NYC Fire Code and Mechanical Code Compliance
Building Operation, Maintenance, and Recordkeeping (BOMR)
Fire Safety and Emergency Procedures
Introduction
The FDNY Z-51 / RSOE Fundamentals Examination assesses
the knowledge and competency of candidates seeking
certification as Refrigerating System Operating Engineers.
Effective July 1, 2026, the written exam is titled "Refrigerating
System Operating Engineer Exam Part I" (RSOE
Fundamentals). This comprehensive test bank evaluates
understanding of refrigeration theory, practical machinery
operation, safety procedures, and regulatory compliance within
New York City. The test employs multiple-choice and scenario-
based questions designed to simulate real-world operational
challenges. Emphasis is placed on applied decision-making,
troubleshooting methodology, and adherence to established fire
safety and building codes to ensure public safety in the
operation of refrigeration systems.
,SECTION ONE: QUESTIONS 1–200
1. What is the primary purpose of a Certificate of Fitness
(COF) issued by FDNY?
A. To allow anyone to perform fire safety duties
B. To prove a person has the required knowledge to safely
perform specific duties
C. To replace all building permits
D. To eliminate the need for fire inspections
B. To prove a person has the required knowledge to safely
perform specific duties
RATIONALE: A COF verifies that an individual has passed
the required FDNY exam and understands safety responsibilities
for specific operations.
2. When must the Fire Department be notified that a fire
protection system is out of service?
A. The manual pull alarm station in the lobby will be out of
service for 4 hours
B. Four sprinkler heads on the same floor will be out of service
for 2 hours
C. The sprinkler system will be out of service on the 1st and 2nd
floors
D. The fire alarm system is out of service for 6 hours
C. The sprinkler system will be out of service on the 1st and
2nd floors
, RATIONALE: FDNY rules require notification when an
entire sprinkler system or a significant portion (such as multiple
floors) is taken out of service.
3. Hot work authorizations are issued by:
A. A Responsible Person designated by the Building Owner
B. A Building Department inspector
C. A FDNY inspector
D. The Building owner's insurance company
A. A Responsible Person designated by the Building Owner
RATIONALE: The NYC Fire Code requires that a
"Responsible Person" designated by the building owner issue
hot work permits.
4. COP is 240 kW cooling divided by 60 kW input. What is
COP?
A. 2
B. 3
C. 4
D. 5
C. 4
RATIONALE: COP = 240/60 = 4.
5. 80 psig plus 14.7 psi atmospheric pressure equals
approximately:
— ACTUAL QUESTIONS AND
VERIFIED ANSWERS|, 2026 NEW
CURRICULUM|NEWEST UPDATE
,Core Domains
Refrigeration Theory and Mathematics
Vapor-Compression Cycle and System Components
Compressors, Condensers, and Evaporators
Refrigerant Metering Devices and Controls
Refrigerant Classifications, Safety, and Handling
Electrical Components and Controls
Plant Operations, Maintenance, and Recordkeeping
NYC Fire Code and Mechanical Code Compliance
Building Operation, Maintenance, and Recordkeeping (BOMR)
Fire Safety and Emergency Procedures
Introduction
The FDNY Z-51 / RSOE Fundamentals Examination assesses
the knowledge and competency of candidates seeking
certification as Refrigerating System Operating Engineers.
Effective July 1, 2026, the written exam is titled "Refrigerating
System Operating Engineer Exam Part I" (RSOE
Fundamentals). This comprehensive test bank evaluates
understanding of refrigeration theory, practical machinery
operation, safety procedures, and regulatory compliance within
New York City. The test employs multiple-choice and scenario-
based questions designed to simulate real-world operational
challenges. Emphasis is placed on applied decision-making,
troubleshooting methodology, and adherence to established fire
safety and building codes to ensure public safety in the
operation of refrigeration systems.
,SECTION ONE: QUESTIONS 1–200
1. What is the primary purpose of a Certificate of Fitness
(COF) issued by FDNY?
A. To allow anyone to perform fire safety duties
B. To prove a person has the required knowledge to safely
perform specific duties
C. To replace all building permits
D. To eliminate the need for fire inspections
B. To prove a person has the required knowledge to safely
perform specific duties
RATIONALE: A COF verifies that an individual has passed
the required FDNY exam and understands safety responsibilities
for specific operations.
2. When must the Fire Department be notified that a fire
protection system is out of service?
A. The manual pull alarm station in the lobby will be out of
service for 4 hours
B. Four sprinkler heads on the same floor will be out of service
for 2 hours
C. The sprinkler system will be out of service on the 1st and 2nd
floors
D. The fire alarm system is out of service for 6 hours
C. The sprinkler system will be out of service on the 1st and
2nd floors
, RATIONALE: FDNY rules require notification when an
entire sprinkler system or a significant portion (such as multiple
floors) is taken out of service.
3. Hot work authorizations are issued by:
A. A Responsible Person designated by the Building Owner
B. A Building Department inspector
C. A FDNY inspector
D. The Building owner's insurance company
A. A Responsible Person designated by the Building Owner
RATIONALE: The NYC Fire Code requires that a
"Responsible Person" designated by the building owner issue
hot work permits.
4. COP is 240 kW cooling divided by 60 kW input. What is
COP?
A. 2
B. 3
C. 4
D. 5
C. 4
RATIONALE: COP = 240/60 = 4.
5. 80 psig plus 14.7 psi atmospheric pressure equals
approximately:
