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FDNY P-99 Certificate of Fitness (C of F) for Low Pressure Oil
Burner Operator Exam | Latest Verified Questions and
Detailed Answers
OVERVIEW DESCRIPTION
This comprehensive set of multiple choice questions is designed for the FDNY P-99
Certificate of Fitness (C of F) for Low Pressure Oil Burner Operator exam. The
examination assesses a candidate’s knowledge of low-pressure boiler fundamentals
(steam up to 15 psi and hot water up to 250°F), oil burner systems and components,
fuel handling and storage for #2, #4, and #6 oils, essential safety controls and devices,
combustion processes, maintenance and inspection requirements, emergency
shutdown procedures, and compliance with Chapter 6 of the NYC Fire Code. The exam
is administered by the New York City Fire Department (FDNY) to ensure operators of
non-fully automatic or preheating-required oil burners have the competence to
maintain a safe and code-compliant boiler operation.
QUESTION 1
What is the maximum allowable working pressure for a low-pressure steam boiler under
NYC jurisdiction?
A) 10 psi
B) 15 psi
C) 20 psi
D) 30 psi
CORRECT ANSWER: B) 15 psi
EXPERT RATIONALE: A low-pressure steam boiler is defined as one operating at a
pressure not exceeding 15 psi. This threshold distinguishes low-pressure from
high-pressure boilers.
QUESTION 2
A low-pressure hot water boiler is operated at a maximum temperature of:
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A) 180°F
B) 200°F
C) 250°F
D) 300°F
CORRECT ANSWER: C) 250°F
EXPERT RATIONALE: NYC code defines low-pressure hot water boilers as those with a
maximum operating temperature of 250°F. Higher temperatures require a different
classification and operator license.
QUESTION 3
What is the maximum allowable working pressure for a low-pressure hot water boiler?
A) 30 psi
B) 60 psi
C) 100 psi
D) 160 psi
CORRECT ANSWER: D) 160 psi
EXPERT RATIONALE: Low-pressure hot water boilers may operate at pressures up to 160
psi while still being classified as low-pressure. This is distinct from steam boilers, which
are limited to 15 psi.
QUESTION 4
Which fuel oil typically requires preheating for proper atomization and pumping?
A) #2 fuel oil
B) Kerosene
C) #4 fuel oil in warm weather
D) #6 fuel oil
CORRECT ANSWER: D) #6 fuel oil
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EXPERT RATIONALE: #6 fuel oil is a heavy residual oil that must be heated to lower its
viscosity for pumping and atomization. #2 oil is light and does not require preheating.
QUESTION 5
Which certificate of fitness is required for a person who operates a low-pressure oil
burner that is not fully automatic or requires preheating?
A) P-98
B) P-99
C) F-01
D) S-12
CORRECT ANSWER: B) P-99
EXPERT RATIONALE: The P-99 Certificate of Fitness is specifically for low-pressure oil
burner operators when the burner is not fully automatic or needs preheating. Other
certificates cover different equipment or supervision.
QUESTION 6
When must the P-99 certificate holder be present in the building?
A) Only during burner start-up
B) Only when a fire watch is in effect
C) At all times while the oil burner is in operation
D) Only during an annual inspection
CORRECT ANSWER: C) At all times while the oil burner is in operation
EXPERT RATIONALE: The certificate requires the holder’s continuous presence while the
burner is firing. This ensures immediate response to any malfunction or emergency.
QUESTION 7
In a low-pressure steam boiler, what is the function of an aquastat?
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A) Controls burner operation based on steam pressure
B) Senses water temperature and cycles the burner
C) Relieves excess steam pressure
D) Indicates vacuum in the combustion chamber
CORRECT ANSWER: B) Senses water temperature and cycles the burner
EXPERT RATIONALE: Aquastats are used in hot water boilers to maintain setpoint
temperature, not steam pressure. In steam systems, a pressuretrol performs analogous
control.
QUESTION 8
Which safety device must be tested weekly by performing a slow drain test?
A) Safety relief valve
B) Low water cutoff
C) Stack switch
D) Combustion air damper
CORRECT ANSWER: B) Low water cutoff
EXPERT RATIONALE: The low water cutoff must be tested weekly to verify it will safely
shut down the burner if water level drops. The slow drain test simulates a falling water
level without causing an actual low-water condition.
QUESTION 9
What is the primary purpose of a stack switch (primary control) on an oil burner?
A) Regulate fuel oil temperature
B) Monitor stack temperature to prove flame
C) Control feedwater supply
D) Maintain steam pressure
CORRECT ANSWER: B) Monitor stack temperature to prove flame
FDNY P-99 Certificate of Fitness (C of F) for Low Pressure Oil
Burner Operator Exam | Latest Verified Questions and
Detailed Answers
OVERVIEW DESCRIPTION
This comprehensive set of multiple choice questions is designed for the FDNY P-99
Certificate of Fitness (C of F) for Low Pressure Oil Burner Operator exam. The
examination assesses a candidate’s knowledge of low-pressure boiler fundamentals
(steam up to 15 psi and hot water up to 250°F), oil burner systems and components,
fuel handling and storage for #2, #4, and #6 oils, essential safety controls and devices,
combustion processes, maintenance and inspection requirements, emergency
shutdown procedures, and compliance with Chapter 6 of the NYC Fire Code. The exam
is administered by the New York City Fire Department (FDNY) to ensure operators of
non-fully automatic or preheating-required oil burners have the competence to
maintain a safe and code-compliant boiler operation.
QUESTION 1
What is the maximum allowable working pressure for a low-pressure steam boiler under
NYC jurisdiction?
A) 10 psi
B) 15 psi
C) 20 psi
D) 30 psi
CORRECT ANSWER: B) 15 psi
EXPERT RATIONALE: A low-pressure steam boiler is defined as one operating at a
pressure not exceeding 15 psi. This threshold distinguishes low-pressure from
high-pressure boilers.
QUESTION 2
A low-pressure hot water boiler is operated at a maximum temperature of:
,2|Page
A) 180°F
B) 200°F
C) 250°F
D) 300°F
CORRECT ANSWER: C) 250°F
EXPERT RATIONALE: NYC code defines low-pressure hot water boilers as those with a
maximum operating temperature of 250°F. Higher temperatures require a different
classification and operator license.
QUESTION 3
What is the maximum allowable working pressure for a low-pressure hot water boiler?
A) 30 psi
B) 60 psi
C) 100 psi
D) 160 psi
CORRECT ANSWER: D) 160 psi
EXPERT RATIONALE: Low-pressure hot water boilers may operate at pressures up to 160
psi while still being classified as low-pressure. This is distinct from steam boilers, which
are limited to 15 psi.
QUESTION 4
Which fuel oil typically requires preheating for proper atomization and pumping?
A) #2 fuel oil
B) Kerosene
C) #4 fuel oil in warm weather
D) #6 fuel oil
CORRECT ANSWER: D) #6 fuel oil
,3|Page
EXPERT RATIONALE: #6 fuel oil is a heavy residual oil that must be heated to lower its
viscosity for pumping and atomization. #2 oil is light and does not require preheating.
QUESTION 5
Which certificate of fitness is required for a person who operates a low-pressure oil
burner that is not fully automatic or requires preheating?
A) P-98
B) P-99
C) F-01
D) S-12
CORRECT ANSWER: B) P-99
EXPERT RATIONALE: The P-99 Certificate of Fitness is specifically for low-pressure oil
burner operators when the burner is not fully automatic or needs preheating. Other
certificates cover different equipment or supervision.
QUESTION 6
When must the P-99 certificate holder be present in the building?
A) Only during burner start-up
B) Only when a fire watch is in effect
C) At all times while the oil burner is in operation
D) Only during an annual inspection
CORRECT ANSWER: C) At all times while the oil burner is in operation
EXPERT RATIONALE: The certificate requires the holder’s continuous presence while the
burner is firing. This ensures immediate response to any malfunction or emergency.
QUESTION 7
In a low-pressure steam boiler, what is the function of an aquastat?
, 4|Page
A) Controls burner operation based on steam pressure
B) Senses water temperature and cycles the burner
C) Relieves excess steam pressure
D) Indicates vacuum in the combustion chamber
CORRECT ANSWER: B) Senses water temperature and cycles the burner
EXPERT RATIONALE: Aquastats are used in hot water boilers to maintain setpoint
temperature, not steam pressure. In steam systems, a pressuretrol performs analogous
control.
QUESTION 8
Which safety device must be tested weekly by performing a slow drain test?
A) Safety relief valve
B) Low water cutoff
C) Stack switch
D) Combustion air damper
CORRECT ANSWER: B) Low water cutoff
EXPERT RATIONALE: The low water cutoff must be tested weekly to verify it will safely
shut down the burner if water level drops. The slow drain test simulates a falling water
level without causing an actual low-water condition.
QUESTION 9
What is the primary purpose of a stack switch (primary control) on an oil burner?
A) Regulate fuel oil temperature
B) Monitor stack temperature to prove flame
C) Control feedwater supply
D) Maintain steam pressure
CORRECT ANSWER: B) Monitor stack temperature to prove flame
