https://www.stuvia.com/user/Performance
FDNY COF P-98 – FUEL-OIL PIPING AND STORAGE SYSTEMS COMPREHENSIVE PRACTICE
EXAMINATION – QUESTIONS With Answers and Rationales
SECTION 1: FUEL OIL BASICS AND PROPERTIES (Questions)
1. The most common type of fuel oil used in NYC buildings is:
A) No. 1 fuel oil
B) No. 2 fuel oil
C) No. 4 fuel oil
D) No. 6 fuel oil
Answer: B
Rationale: No. 2 fuel oil is the most common for residential and
commercial heating in NYC.
2. No. 6 fuel oil is also known as:
A) Kerosene
B) Bunker C oil or residual oil
C) Diesel only
D) Gasoline only
,https://www.stuvia.com/user/Performance
Answer: B
Rationale: No. 6 oil is a heavy residual oil (Bunker C).
3. The "flash point" of No. 2 fuel oil is approximately:
A) 50°F
B) 100°F
C) 125°F (minimum)
D) 200°F
Answer: C
Rationale: No. 2 oil has a minimum flash point of about 100-
125°F.
4. The "flash point" is the temperature at which:
A) The oil freezes
B) The oil gives off enough vapor to ignite momentarily
C) The oil boils
D) The oil becomes solid
Answer: B
Rationale: Flash point = vapor ignition temperature.
,https://www.stuvia.com/user/Performance
5. No. 6 fuel oil must be heated to:
A) Freeze it
B) Reduce viscosity for pumping and atomization
C) Increase density only
D) Change its color
Answer: B
Rationale: No. 6 oil is thick and requires heating.
6. "Viscosity" refers to a liquid's:
A) Color
B) Resistance to flow
C) Flash point
D) Density only
Answer: B
Rationale: Viscosity = thickness/resistance to flow.
7. "API gravity" is a measure of petroleum liquid's density
relative to:
A) Air
B) Water
, https://www.stuvia.com/user/Performance
C) Mercury
D) Alcohol only
Answer: B
Rationale: API gravity compares to water.
8. "Pour point" is the temperature below which:
A) Oil ignites
B) Oil will not flow
C) Oil boils
D) Oil evaporates only
Answer: B
Rationale: Pour point = lowest flow temperature.
9. "Sulfur content" in fuel oil is regulated because sulfur
causes:
A) Only odor
B) Air pollution (acid rain, particulate matter)
C) Only corrosion
D) Only color change
FDNY COF P-98 – FUEL-OIL PIPING AND STORAGE SYSTEMS COMPREHENSIVE PRACTICE
EXAMINATION – QUESTIONS With Answers and Rationales
SECTION 1: FUEL OIL BASICS AND PROPERTIES (Questions)
1. The most common type of fuel oil used in NYC buildings is:
A) No. 1 fuel oil
B) No. 2 fuel oil
C) No. 4 fuel oil
D) No. 6 fuel oil
Answer: B
Rationale: No. 2 fuel oil is the most common for residential and
commercial heating in NYC.
2. No. 6 fuel oil is also known as:
A) Kerosene
B) Bunker C oil or residual oil
C) Diesel only
D) Gasoline only
,https://www.stuvia.com/user/Performance
Answer: B
Rationale: No. 6 oil is a heavy residual oil (Bunker C).
3. The "flash point" of No. 2 fuel oil is approximately:
A) 50°F
B) 100°F
C) 125°F (minimum)
D) 200°F
Answer: C
Rationale: No. 2 oil has a minimum flash point of about 100-
125°F.
4. The "flash point" is the temperature at which:
A) The oil freezes
B) The oil gives off enough vapor to ignite momentarily
C) The oil boils
D) The oil becomes solid
Answer: B
Rationale: Flash point = vapor ignition temperature.
,https://www.stuvia.com/user/Performance
5. No. 6 fuel oil must be heated to:
A) Freeze it
B) Reduce viscosity for pumping and atomization
C) Increase density only
D) Change its color
Answer: B
Rationale: No. 6 oil is thick and requires heating.
6. "Viscosity" refers to a liquid's:
A) Color
B) Resistance to flow
C) Flash point
D) Density only
Answer: B
Rationale: Viscosity = thickness/resistance to flow.
7. "API gravity" is a measure of petroleum liquid's density
relative to:
A) Air
B) Water
, https://www.stuvia.com/user/Performance
C) Mercury
D) Alcohol only
Answer: B
Rationale: API gravity compares to water.
8. "Pour point" is the temperature below which:
A) Oil ignites
B) Oil will not flow
C) Oil boils
D) Oil evaporates only
Answer: B
Rationale: Pour point = lowest flow temperature.
9. "Sulfur content" in fuel oil is regulated because sulfur
causes:
A) Only odor
B) Air pollution (acid rain, particulate matter)
C) Only corrosion
D) Only color change
