FDNY Z-51 REFRIGERATION EXAM:
COMPLETE TEST BANK WITH 150 NGN-STYLE
QUESTIONS, VERIFIED ANSWERS &
DETAILED RATIONALES | NYC FIRE CODE
2026/2027 EDITION
,CORE DOMAINS
• Refrigeration Cycle Theory and Thermodynamics
• Compressor Operation, Types, and Capacity Control
• Condensers, Evaporators, and Metering Devices
• Refrigerant Properties, Classifications, and Safety
• System Controls, Safety Devices, and Electrical Theory
• Centrifugal Pumps, Cooling Towers, and Steam Turbines
• NYC Fire Code, ASHRAE Standards, and Permit Requirements
• Plant Operations, Maintenance, and Recordkeeping
• Machine Room Safety and Emergency Procedures
• A2L Refrigerant Compliance and EPA Regulations
INTRODUCTION
The FDNY Z-51 examination is the first part of the Q-01 Certificate of
Qualification for Refrigerating System Operating Engineers. This assessment
evaluates a candidate's knowledge of refrigeration theory, compressor
operation, system controls, safety protocols, New York City Fire Code
requirements, and ASHRAE standards. The exam consists of multiple-choice
and scenario-based questions administered within a time limit, with a required
passing score. Candidates must demonstrate competency across all content
areas, including new A2L refrigerant compliance requirements. Success
demands mastery of thermodynamic principles, practical plant operations,
machine-room safety, and the ability to interpret and apply fire code
regulations to real-world refrigerating system operations.
SECTION ONE: QUESTIONS 1–100
Question 1
,What is the primary purpose of the FDNY Certificate of Fitness for
Refrigerating System Operating Engineer (RSOE)?
A. To certify that an individual has completed a general safety orientation.
B. To verify that an individual possesses the knowledge and qualifications to
operate refrigerating systems safely and in compliance with NYC codes.
C. To authorize the holder to perform electrical wiring on refrigeration
equipment.
D. To permit the holder to purchase regulated refrigerants without EPA
certification.
B. To verify that an individual possesses the knowledge and qualifications
to operate refrigerating systems safely and in compliance with NYC codes.
RATIONALE: The RSOE Certificate of Fitness is issued by FDNY to
individuals who demonstrate through examination that they understand the
operation, maintenance, and safety requirements of refrigerating systems as
mandated by the New York City Fire Code and related regulations .
Question 2
How many multiple-choice questions does the Z-51 computer exam currently
consist of?
A. 75 questions
B. 100 questions
C. 110 questions
D. 125 questions
C. 110 questions
RATIONALE: According to the FDNY Notice of Exam, the Z-51 exam
consists of 110 multiple-choice questions, including additional questions
regarding the Building Operation, Maintenance and Recordkeeping Training
Course Manual .
, Question 3
What is the minimum passing score required for the Z-51 computer exam?
A. 60%
B. 65%
C. 70%
D. 75%
C. 70%
RATIONALE: The FDNY specifies that a passing score of at least 70% is
required to pass the Z-51 exam. Candidates who fail must wait before retaking
the examination .
Question 4
How much time is allotted to complete the Z-51 computer exam?
A. 120 minutes
B. 150 minutes
C. 193 minutes
D. 240 minutes
C. 193 minutes
RATIONALE: Based on the number of questions (110), candidates are
given 193 minutes to complete the Z-51 computer exam .
Question 5
Which of the following is NOT typically required to qualify for the Z-51 exam?
A. High school diploma or GED
B. Universal Technician Certification (EPA)
COMPLETE TEST BANK WITH 150 NGN-STYLE
QUESTIONS, VERIFIED ANSWERS &
DETAILED RATIONALES | NYC FIRE CODE
2026/2027 EDITION
,CORE DOMAINS
• Refrigeration Cycle Theory and Thermodynamics
• Compressor Operation, Types, and Capacity Control
• Condensers, Evaporators, and Metering Devices
• Refrigerant Properties, Classifications, and Safety
• System Controls, Safety Devices, and Electrical Theory
• Centrifugal Pumps, Cooling Towers, and Steam Turbines
• NYC Fire Code, ASHRAE Standards, and Permit Requirements
• Plant Operations, Maintenance, and Recordkeeping
• Machine Room Safety and Emergency Procedures
• A2L Refrigerant Compliance and EPA Regulations
INTRODUCTION
The FDNY Z-51 examination is the first part of the Q-01 Certificate of
Qualification for Refrigerating System Operating Engineers. This assessment
evaluates a candidate's knowledge of refrigeration theory, compressor
operation, system controls, safety protocols, New York City Fire Code
requirements, and ASHRAE standards. The exam consists of multiple-choice
and scenario-based questions administered within a time limit, with a required
passing score. Candidates must demonstrate competency across all content
areas, including new A2L refrigerant compliance requirements. Success
demands mastery of thermodynamic principles, practical plant operations,
machine-room safety, and the ability to interpret and apply fire code
regulations to real-world refrigerating system operations.
SECTION ONE: QUESTIONS 1–100
Question 1
,What is the primary purpose of the FDNY Certificate of Fitness for
Refrigerating System Operating Engineer (RSOE)?
A. To certify that an individual has completed a general safety orientation.
B. To verify that an individual possesses the knowledge and qualifications to
operate refrigerating systems safely and in compliance with NYC codes.
C. To authorize the holder to perform electrical wiring on refrigeration
equipment.
D. To permit the holder to purchase regulated refrigerants without EPA
certification.
B. To verify that an individual possesses the knowledge and qualifications
to operate refrigerating systems safely and in compliance with NYC codes.
RATIONALE: The RSOE Certificate of Fitness is issued by FDNY to
individuals who demonstrate through examination that they understand the
operation, maintenance, and safety requirements of refrigerating systems as
mandated by the New York City Fire Code and related regulations .
Question 2
How many multiple-choice questions does the Z-51 computer exam currently
consist of?
A. 75 questions
B. 100 questions
C. 110 questions
D. 125 questions
C. 110 questions
RATIONALE: According to the FDNY Notice of Exam, the Z-51 exam
consists of 110 multiple-choice questions, including additional questions
regarding the Building Operation, Maintenance and Recordkeeping Training
Course Manual .
, Question 3
What is the minimum passing score required for the Z-51 computer exam?
A. 60%
B. 65%
C. 70%
D. 75%
C. 70%
RATIONALE: The FDNY specifies that a passing score of at least 70% is
required to pass the Z-51 exam. Candidates who fail must wait before retaking
the examination .
Question 4
How much time is allotted to complete the Z-51 computer exam?
A. 120 minutes
B. 150 minutes
C. 193 minutes
D. 240 minutes
C. 193 minutes
RATIONALE: Based on the number of questions (110), candidates are
given 193 minutes to complete the Z-51 computer exam .
Question 5
Which of the following is NOT typically required to qualify for the Z-51 exam?
A. High school diploma or GED
B. Universal Technician Certification (EPA)
