Exam Questions And Correct Answers

FDNY C91 Supervision of Storage, Handling and Use of Hazardous Materials Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which of the following is the primary federal agency responsible for

regulating hazardous materials transportation?

A) EPA

B) OSHA

C) DOT

D) NFPA

Rationale: The Department of Transportation (DOT) sets regulations

for the safe transport of hazardous materials under 49 CFR.

• What is the primary hazard class for flammable liquids according to

DOT regulations?

• Class 1 1 / 4

• Class 3
• Class 4
• Class 5

Rationale: DOT Class 3 includes flammable and combustible liquids,

such as gasoline and acetone.

• Under NFPA 704, what does a red diamond indicate?
• Health hazard
• Reactivity hazard
• Flammability hazard
• Special hazard

Rationale: In the NFPA 704 “fire diamond,” red represents

flammability, blue represents health, yellow represents instability, and white represents special hazards.

• The OSHA Hazard Communication Standard requires employers to

maintain:

• Safety Data Sheets (SDS) for all hazardous chemicals
• Fire extinguishers in all areas
• Personal hygiene facilities only for flammable materials
• Monthly chemical inventories

Rationale: OSHA 29 CFR 1910.1200 requires that SDSs be available to

employees for all hazardous chemicals.

• Which storage practice is most important for oxidizers?
• Store with flammables 2 / 4

• Store separately from flammables and combustibles
• Store near heat sources
• Store in airtight metal containers only

Rationale: Oxidizers can intensify fires; therefore, they must be

stored separately from flammable and combustible materials.

• What is the maximum quantity of Class I flammable liquids allowed in

a control area without a special permit, according to NFPA 30?

• 10 gallons
• 25 gallons
• 55 gallons
• 100 gallons

Rationale: NFPA 30 sets limits on the quantity of flammable liquids

that can be stored in areas without special permitting; for Class I liquids, 25 gallons is typically the threshold.

• What type of fire extinguisher is suitable for electrical fires?
• Water
• Foam

C) CO₂

• Wet chemical

Rationale: CO₂ extinguishers are non-conductive and suitable for

electrical fires.

• What is the main health hazard associated with hydrogen sulfide

exposure? 3 / 4

• Burns
• Respiratory paralysis
• Skin irritation only
• Eye dryness

Rationale: Hydrogen sulfide is highly toxic and can cause respiratory

paralysis or death at high concentrations.

• Which NFPA standard covers the storage and handling of flammable

and combustible liquids?

A) NFPA 10

B) NFPA 704

C) NFPA 30

D) NFPA 400

Rationale: NFPA 30 specifically addresses storage, handling, and use

of flammable and combustible liquids.

10. When labeling hazardous materials, the DOT requires:

• Only chemical name
• Only manufacturer information
• Proper shipping name, hazard class, and identification number
• No labeling is required if SDS is available

Rationale: DOT labeling regulations require the proper shipping

name, hazard class, and UN identification number on packages containing hazardous materials.

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