FDNY C91 SUPERVISION OF STORAGE,
HANDLING, AND USE OF HAZARDOUS
MATERIALS PRACTICE EXAM COMPLETE
QUESTIONS WITH VERIFIED DETAILED
SOLUTIONS GRADED A+ LATEST UPDATE
2026-JUST RELEASED.|BRAND NEW
BOILING POINT - answer-The temperature at which the vapor pressure of a liquid equals
the atmospheric pressure of 14.7 pounds per square inch (psia) or 760 mm of mercury.
Where a boiling point is unavailable for the material in question or for mixtures which do
not have a constant boiling point, for the purposes of this classification, the 20-percent
evaporated point of a distillation performed in accordance with ASTM D 86 shall be
used as the boiling point of the liquid.
CEILING LIMIT - answer-The maximum concentration of an airborne contaminant to
which one may be exposed shall be as established by the regulations of the United
States Department of Labor, as set forth in 29 CFR Part 1910.1000, or if not listed
therein, the ceiling Recommended Exposure Limit (REL-C) concentrations published by
the U.S. National Institute for Occupational Safety and Health (NIOSH), the Threshold
Limit Value — Ceiling (TLV-C) concentrations published by the American Conference of
Governmental Industrial Hygienists (ACGIH), the ceiling Workplace Environmental
Exposure Level (WEEL-Ceiling) Guides published by the American Industrial Hygiene
Association (AIHA), or other approved standard.
CHEMICAL - answer-An element, chemical compound or mixture of elements or
compounds or both.
CHEMICAL NAME - answer-The scientific designation of a chemical in accordance with
the nomenclature system developed by the International Union of Pure and Applied
Chemistry, the Chemical Abstracts Service rules of nomenclature, or a name that will
clearly identify a chemical for the purpose of conducting an evaluation.
, CLOSED CONTAINER - answer-A container sealed by means of a lid or other device
capable of preventing the escape of liquid, vapor or dusts in the ordinary course of
storage, handling or use.
CONTAINER - answer-For solid and liquid hazardous materials, a vessel of 60 gallons or
less in capacity used for storage or transportation. For compressed gases, a cylinder,
pressure vessel or tank designed for pressures greater than one atmosphere at 68°F.
Pipes, piping systems, engines and engine fuel tanks associated with solid or liquid
hazardous materials or compressed gases, shall not be deemed to be containers if in
active use.
CONTAINMENT SYSTEM - answer-A gas-tight recovery system comprised of devices or
equipment which, when placed over or around the portion of the compressed gas
container that is leaking, stops or controls the escape of gas from the container.
CONTAINMENT VESSEL - answer-A gas-tight vessel which, when installed or placed
over or around a leaking compressed gas container, confines the container and the gas
leaking there from.
CONTROL AREA - answer-Spaces within a building that are enclosed and bounded by
exterior walls, fire walls, fire barriers and roofs, or a combination thereof, where
quantities of hazardous materials not exceeding the maximum allowable quantities per
control area are stored, handled or used, including any dispensing.
DESIGN PRESSURE - answer-The maximum gauge pressure that a pressure vessel,
device, component or system is designed to withstand safely under the temperature
and conditions of use.
DETACHED BUILDING - answer-A separate single-story building, without a basement or
crawl space, used for the storage, handling or use of hazardous materials and located
an approved distance from other buildings or structures.
DISPENSING - answer-The pouring or transferring by other means of any material from a
container, tank or similar vessel, which would release dusts, fumes, mists, vapors or
HANDLING, AND USE OF HAZARDOUS
MATERIALS PRACTICE EXAM COMPLETE
QUESTIONS WITH VERIFIED DETAILED
SOLUTIONS GRADED A+ LATEST UPDATE
2026-JUST RELEASED.|BRAND NEW
BOILING POINT - answer-The temperature at which the vapor pressure of a liquid equals
the atmospheric pressure of 14.7 pounds per square inch (psia) or 760 mm of mercury.
Where a boiling point is unavailable for the material in question or for mixtures which do
not have a constant boiling point, for the purposes of this classification, the 20-percent
evaporated point of a distillation performed in accordance with ASTM D 86 shall be
used as the boiling point of the liquid.
CEILING LIMIT - answer-The maximum concentration of an airborne contaminant to
which one may be exposed shall be as established by the regulations of the United
States Department of Labor, as set forth in 29 CFR Part 1910.1000, or if not listed
therein, the ceiling Recommended Exposure Limit (REL-C) concentrations published by
the U.S. National Institute for Occupational Safety and Health (NIOSH), the Threshold
Limit Value — Ceiling (TLV-C) concentrations published by the American Conference of
Governmental Industrial Hygienists (ACGIH), the ceiling Workplace Environmental
Exposure Level (WEEL-Ceiling) Guides published by the American Industrial Hygiene
Association (AIHA), or other approved standard.
CHEMICAL - answer-An element, chemical compound or mixture of elements or
compounds or both.
CHEMICAL NAME - answer-The scientific designation of a chemical in accordance with
the nomenclature system developed by the International Union of Pure and Applied
Chemistry, the Chemical Abstracts Service rules of nomenclature, or a name that will
clearly identify a chemical for the purpose of conducting an evaluation.
, CLOSED CONTAINER - answer-A container sealed by means of a lid or other device
capable of preventing the escape of liquid, vapor or dusts in the ordinary course of
storage, handling or use.
CONTAINER - answer-For solid and liquid hazardous materials, a vessel of 60 gallons or
less in capacity used for storage or transportation. For compressed gases, a cylinder,
pressure vessel or tank designed for pressures greater than one atmosphere at 68°F.
Pipes, piping systems, engines and engine fuel tanks associated with solid or liquid
hazardous materials or compressed gases, shall not be deemed to be containers if in
active use.
CONTAINMENT SYSTEM - answer-A gas-tight recovery system comprised of devices or
equipment which, when placed over or around the portion of the compressed gas
container that is leaking, stops or controls the escape of gas from the container.
CONTAINMENT VESSEL - answer-A gas-tight vessel which, when installed or placed
over or around a leaking compressed gas container, confines the container and the gas
leaking there from.
CONTROL AREA - answer-Spaces within a building that are enclosed and bounded by
exterior walls, fire walls, fire barriers and roofs, or a combination thereof, where
quantities of hazardous materials not exceeding the maximum allowable quantities per
control area are stored, handled or used, including any dispensing.
DESIGN PRESSURE - answer-The maximum gauge pressure that a pressure vessel,
device, component or system is designed to withstand safely under the temperature
and conditions of use.
DETACHED BUILDING - answer-A separate single-story building, without a basement or
crawl space, used for the storage, handling or use of hazardous materials and located
an approved distance from other buildings or structures.
DISPENSING - answer-The pouring or transferring by other means of any material from a
container, tank or similar vessel, which would release dusts, fumes, mists, vapors or
