Confined Space Exam Questions
with 100% Correct Answers
Definition: Acceptable entry conditions - Answer- Conditions that must exist in a permit
space to allow entry and to ensure that employees involved with a permit-required
confined space entry can SAFELY ENTER AND WORK within the space.
Definition: Attendant - Answer- Individual stationed OUTSIDE one or more permit
spaces who monitors the authorized entrants and who performs all attendant's duties
assigned in the employer's permit space program.
Definition: Authorized entrant - Answer- An employee who is authorized by the
employer to enter a permit space.
Definition: Blanking or blinding - Answer- BLOCKING A PIPE, LINE, OR DUCT
Absolute closure of a pipe, line, or duct by the fastening of a solid place (such as a
spectacle blind or a skillet blind) that completely covers the bore and that is capable of
withstanding the maximum pressure of the pipe, line, or duct with no leakage beyond
the plate.
Definition: Confined space - Answer- A space that:
1) Is large enough and so configured that an employee can bodily enter and perform
assigned work
2) Has limited or restricted means for entry or exit (e.g. tanks, vessels, silos, storage
bins, hoppers, vaults, and pits are spaces that may have limited means of entry)
3) Is not designed for continuous employee occupancy
Definition: Double block and bleed - Answer- The closure of a line, duct, or pipe by
closing and locking or tagging two in-line valves and by opening and locking or tagging
a drain or vent valve in the line between the two closed valves.
Definition: Emergency - Answer- Any occurrence (including any failure of hazard control
or monitoring equipment) or event internal or external to the permit space that could
endanger entrants.
Definition: Engulfment - Answer- The surrounding and effective capture of a person by
liquid or finely divided (flowable) solid substance that can be aspirated to cause death
by filling or plugging the respiratory system or that can exert enough force on the body
to cause death by strangulation, construction, or crushing
, Definition: Entry - Answer- The action by which a person passes through an opening
into a permit-required confined space. Entry includes ensuing work activities in that
space and is considered to have occurred as soon as any part of the entrant;s body
breaks the plane of an opening into the space.
Definition: Entry permit - Answer- The written or printed document that is provided by
the employer to allow and control entry into a permit space and that contains the
information specified in subsection (f)
Definition: Entry supervisor - Answer- The person (such as the employer, foreman, or
crew chief) responsible for determining if acceptable entry conditions are present at a
permit space where entry is planned, for authorizing entry and overseeing entry
operations, and for terminating entry as required by this section
NOTE: An entry supervisor also may serve as an attendant, as long as that person is
trained and equipped as required by this section for each role he or she fills. Also, the
duties of entry supervisor may be passed from one individual to another during the
course of an entry operation.
*Definition: Hazardous atmosphere* - Answer- An atmosphere that may expose
employees to the risk of death, incapacitation, impairment of ability to self-rescue, injury,
or acute illness from one or more of the following:
1) Flammable gas, vapor, or mist in excess of 10 percent of its lower flammable limit
(LFL)
2) Airborne combustible dust at a concentration that meets or exceeds its LFL
NOTE: this condition may be approximated as a condition in which the dust obscures
vision at a DISTANCE OF 5 FEET or less
3) Atmospheric oxygen concentration below 19.5 percent or above 23.5 percent
4) Atmospheric concentration of any substance for which a dose is published in Group
14 for Radiation and Radioactivity or a permissible exposure limit is published in section
5155 for Airborne contaminants and which could result in employee exposure in excess
of its dose or permissible exposure limit
5) Any other atmospheric condition that is immediately dangerous to life and health
(IDLH).
Definition: Hot work permit - Answer- The employer's written authorization to perform
operations (e.g. riveting, welding, cutting, burning, and heating) capable of providing a
source of ignition.
Definition: IDLH - Answer- Immediately Dangerous to Life and Health:
Any condition that poses an immediate or delayed threat to life or that would cause
irreversible adverse health effects or that would interfere with an individual's ability to
escape unaided from a permit space (delayed death gases, hydrogen fluoride and
cadmium vapor, are considered IDLH in hazardous quantities)
with 100% Correct Answers
Definition: Acceptable entry conditions - Answer- Conditions that must exist in a permit
space to allow entry and to ensure that employees involved with a permit-required
confined space entry can SAFELY ENTER AND WORK within the space.
Definition: Attendant - Answer- Individual stationed OUTSIDE one or more permit
spaces who monitors the authorized entrants and who performs all attendant's duties
assigned in the employer's permit space program.
Definition: Authorized entrant - Answer- An employee who is authorized by the
employer to enter a permit space.
Definition: Blanking or blinding - Answer- BLOCKING A PIPE, LINE, OR DUCT
Absolute closure of a pipe, line, or duct by the fastening of a solid place (such as a
spectacle blind or a skillet blind) that completely covers the bore and that is capable of
withstanding the maximum pressure of the pipe, line, or duct with no leakage beyond
the plate.
Definition: Confined space - Answer- A space that:
1) Is large enough and so configured that an employee can bodily enter and perform
assigned work
2) Has limited or restricted means for entry or exit (e.g. tanks, vessels, silos, storage
bins, hoppers, vaults, and pits are spaces that may have limited means of entry)
3) Is not designed for continuous employee occupancy
Definition: Double block and bleed - Answer- The closure of a line, duct, or pipe by
closing and locking or tagging two in-line valves and by opening and locking or tagging
a drain or vent valve in the line between the two closed valves.
Definition: Emergency - Answer- Any occurrence (including any failure of hazard control
or monitoring equipment) or event internal or external to the permit space that could
endanger entrants.
Definition: Engulfment - Answer- The surrounding and effective capture of a person by
liquid or finely divided (flowable) solid substance that can be aspirated to cause death
by filling or plugging the respiratory system or that can exert enough force on the body
to cause death by strangulation, construction, or crushing
, Definition: Entry - Answer- The action by which a person passes through an opening
into a permit-required confined space. Entry includes ensuing work activities in that
space and is considered to have occurred as soon as any part of the entrant;s body
breaks the plane of an opening into the space.
Definition: Entry permit - Answer- The written or printed document that is provided by
the employer to allow and control entry into a permit space and that contains the
information specified in subsection (f)
Definition: Entry supervisor - Answer- The person (such as the employer, foreman, or
crew chief) responsible for determining if acceptable entry conditions are present at a
permit space where entry is planned, for authorizing entry and overseeing entry
operations, and for terminating entry as required by this section
NOTE: An entry supervisor also may serve as an attendant, as long as that person is
trained and equipped as required by this section for each role he or she fills. Also, the
duties of entry supervisor may be passed from one individual to another during the
course of an entry operation.
*Definition: Hazardous atmosphere* - Answer- An atmosphere that may expose
employees to the risk of death, incapacitation, impairment of ability to self-rescue, injury,
or acute illness from one or more of the following:
1) Flammable gas, vapor, or mist in excess of 10 percent of its lower flammable limit
(LFL)
2) Airborne combustible dust at a concentration that meets or exceeds its LFL
NOTE: this condition may be approximated as a condition in which the dust obscures
vision at a DISTANCE OF 5 FEET or less
3) Atmospheric oxygen concentration below 19.5 percent or above 23.5 percent
4) Atmospheric concentration of any substance for which a dose is published in Group
14 for Radiation and Radioactivity or a permissible exposure limit is published in section
5155 for Airborne contaminants and which could result in employee exposure in excess
of its dose or permissible exposure limit
5) Any other atmospheric condition that is immediately dangerous to life and health
(IDLH).
Definition: Hot work permit - Answer- The employer's written authorization to perform
operations (e.g. riveting, welding, cutting, burning, and heating) capable of providing a
source of ignition.
Definition: IDLH - Answer- Immediately Dangerous to Life and Health:
Any condition that poses an immediate or delayed threat to life or that would cause
irreversible adverse health effects or that would interfere with an individual's ability to
escape unaided from a permit space (delayed death gases, hydrogen fluoride and
cadmium vapor, are considered IDLH in hazardous quantities)
