OSH 387 Final Exam Questions with Correct Answers Latest Update 2025/2026
The flashpoint of a flammable liquid is __(1) __, while the flashpoint for a combustible liquid is
__(2)__. (NOTE: pick a PAIR of answers; each choice is a pair.)
A. (1) below 73oF -- (2) between 74oF and 140oF
B.(1) between 73oF and 100oF --(2) between 101oF and 140oF
C. below 100oF -- (2) below 200oF
D. (1) below 100oF -- (2) between 100oF and 200oF - Answers D
Define flammable range. How does this differ from flash point? - Answers concentrations in
which a flash will occur or a flame travel if mixture is ignited
Lower explosive limit: minimum concentration for flame to propagate
Upper explosive limit; maximum concentration for flame to propagate
flashpoint- minimum temp. at which a liquid gives off vapor with sufficient concentration to for
ignitable mixture
True or False. Storage cabinets for flammable liquids must be made of steel. - Answers False
You have a 120-sq. foot indoor storage room for flammable liquids. It has a 2-hour fire rating,
but does not have sprinklers. Can you store thirteen 55-gallon drums of flammable solvent in
this room? You must justify your answer to receive credit. - Answers No
An indoor storage room for flammable materials must have a gravity or mechanical exhaust
system supplying at least ____ complete air changes per hour.
A. 4
B. 5
C. 6
D. 7
E. 8 - Answers C
, True or False. 55-gallon drums of flammable liquids may not be stacked in an indoor storage
room. - Answers True
Identify a class of material that would be incompatible with each of the following:
an oxidizer
an alkali
a combustible metal - Answers Organics
acid
water and alcohol solution
When providing fire control devices for a storage room for flammable liquids, where should the
fire extinguisher be located? Why? - Answers At least 1 portable fire extinguisher should be
located between 10-25 feet outside the storage room. This is because if the materials inside the
storage room explode or catch fire you want to have the fire extinguisher far enough away to
access it.
Why can't you transfer flammable liquids by means of air pressure on container/tank? - Answers
Overpressure could damage the container.
Flammable atmosphere could be created inside the container. Sensitive to ignition because of
increased pressure.
List 3 potential sources of ignition in an industrial setting. - Answers cutting and welding,
smoking, lighting
List the 4 manners that flammable or combustible liquids can be drawn from or transferred into
vessels, containers, or portable tanks within a building. - Answers Closed piping system, Safety
cans, Means of a device drawing through the top, Containers or portable tanks by gravity
through an approved self-closing valve.
Powered Industrial Trucks may be gasoline-powered or driven by three other power sources.
What are those 3 power sources? - Answers Diesel, Electric, Liquefied Petroleum Gas (LPG)
List two requirements for battery changing and charging areas. - Answers No smoking,
designated area
A fork lift is considered "unattended" if the operator is more than 25 feet away. What
precautions must be taken if a fork lift is unattended? - Answers Load engaging must be fully
lowered, Control in neutral, Power off, Brakes set and wheels blocked on incline
True or False. When loading the forklift; Load as close to the front wheels as possible to
minimize the load center distance. Load the lightest part toward the mast. - Answers False
The flashpoint of a flammable liquid is __(1) __, while the flashpoint for a combustible liquid is
__(2)__. (NOTE: pick a PAIR of answers; each choice is a pair.)
A. (1) below 73oF -- (2) between 74oF and 140oF
B.(1) between 73oF and 100oF --(2) between 101oF and 140oF
C. below 100oF -- (2) below 200oF
D. (1) below 100oF -- (2) between 100oF and 200oF - Answers D
Define flammable range. How does this differ from flash point? - Answers concentrations in
which a flash will occur or a flame travel if mixture is ignited
Lower explosive limit: minimum concentration for flame to propagate
Upper explosive limit; maximum concentration for flame to propagate
flashpoint- minimum temp. at which a liquid gives off vapor with sufficient concentration to for
ignitable mixture
True or False. Storage cabinets for flammable liquids must be made of steel. - Answers False
You have a 120-sq. foot indoor storage room for flammable liquids. It has a 2-hour fire rating,
but does not have sprinklers. Can you store thirteen 55-gallon drums of flammable solvent in
this room? You must justify your answer to receive credit. - Answers No
An indoor storage room for flammable materials must have a gravity or mechanical exhaust
system supplying at least ____ complete air changes per hour.
A. 4
B. 5
C. 6
D. 7
E. 8 - Answers C
, True or False. 55-gallon drums of flammable liquids may not be stacked in an indoor storage
room. - Answers True
Identify a class of material that would be incompatible with each of the following:
an oxidizer
an alkali
a combustible metal - Answers Organics
acid
water and alcohol solution
When providing fire control devices for a storage room for flammable liquids, where should the
fire extinguisher be located? Why? - Answers At least 1 portable fire extinguisher should be
located between 10-25 feet outside the storage room. This is because if the materials inside the
storage room explode or catch fire you want to have the fire extinguisher far enough away to
access it.
Why can't you transfer flammable liquids by means of air pressure on container/tank? - Answers
Overpressure could damage the container.
Flammable atmosphere could be created inside the container. Sensitive to ignition because of
increased pressure.
List 3 potential sources of ignition in an industrial setting. - Answers cutting and welding,
smoking, lighting
List the 4 manners that flammable or combustible liquids can be drawn from or transferred into
vessels, containers, or portable tanks within a building. - Answers Closed piping system, Safety
cans, Means of a device drawing through the top, Containers or portable tanks by gravity
through an approved self-closing valve.
Powered Industrial Trucks may be gasoline-powered or driven by three other power sources.
What are those 3 power sources? - Answers Diesel, Electric, Liquefied Petroleum Gas (LPG)
List two requirements for battery changing and charging areas. - Answers No smoking,
designated area
A fork lift is considered "unattended" if the operator is more than 25 feet away. What
precautions must be taken if a fork lift is unattended? - Answers Load engaging must be fully
lowered, Control in neutral, Power off, Brakes set and wheels blocked on incline
True or False. When loading the forklift; Load as close to the front wheels as possible to
minimize the load center distance. Load the lightest part toward the mast. - Answers False
