OSHA permit-required confined spaces in general industry (29 CFR 1910.146): definitions, hazardous atmospheres, testing order, entry permits, attendant and entry supervisor duties, training and rescue. Free practice quiz with instant feedback; every explanation cites the 29 CFR paragraph it is based on. Independent review material: not affiliated with or endorsed by OSHA, not an OSHA Outreach (10/30-hour) exam, and it does not replace the training and evaluation your employer must provide.
Question 1 · Multiple choice · 90s · 1 pt
Under OSHA's definition, a confined space has which characteristics? Choose the 3 correct answers.
- Large enough for an employee to bodily enter and do work
- Limited or restricted means for entry or exit
- Not designed for continuous employee occupancy
- Always located below ground level
Question 2 · Single choice · 90s · 1 pt
What turns a confined space into a permit-required confined space?
- Being larger than 100 cubic feet in total inside volume
- Being entered by more than two workers at once
- Being located inside a building, not outdoors
- A hazard like a dangerous atmosphere or engulfment
Question 3 · Single choice · 90s · 1 pt
Below what oxygen level is an atmosphere oxygen deficient?
- 20.9 percent by volume
- 16.0 percent by volume
- 19.5 percent by volume
- 23.5 percent by volume
Question 4 · Put in order · 90s · 1 pt
Put the atmospheric tests in the order the standard requires.
- Combustible gases and vapors
- Oxygen
- Toxic gases and vapors
Question 5 · Single choice · 90s · 1 pt
A flammable gas makes the atmosphere hazardous when it is above what share of its lower flammable limit (LFL)?
- 1 percent of its LFL
- 10 percent of its LFL
- 50 percent of its LFL
- 100 percent of its LFL
Question 6 · True / False · 90s · 1 pt
Entry is considered to have occurred as soon as any part of the entrant's body breaks the plane of an opening into the space.
Question 7 · Single choice · 90s · 1 pt
If a workplace has permit spaces, how must the employer inform exposed employees?
- By a note in the employee handbook only
- By posting danger signs or an equally effective means
- By telling the supervisors and nobody else
- By filing a written notice with the local OSHA area office
Question 8 · Single choice · 90s · 1 pt
Who signs the entry permit to authorize entry?
- The attendant stationed outside the space
- The first authorized entrant going in
- The rescue service on call for the job
- The entry supervisor named on the permit
Question 9 · Single choice · 90s · 1 pt
What must the attendant do during entry operations?
- Stay outside the space until relieved by another attendant
- Go in to help the entrants finish the work faster
- Leave briefly to fetch tools if the entrants ask
- Enter at once to rescue any entrant who stops responding to calls
Question 10 · Multiple choice · 90s · 1 pt
When must the attendant order the entrants to evacuate? Choose the 3 correct answers.
- A prohibited condition is detected
- An entrant shows behavioral effects of exposure
- A hazard outside could endanger the entrants
- The job is taking longer than planned
Question 11 · Single choice · 90s · 1 pt
How long must the employer keep each canceled entry permit?
- Until the end of that work shift
- At least 1 year
- At least 30 days
- For 30 years after the entry
Question 12 · Single choice · 90s · 1 pt
When must confined space training be provided?
- Only once, when the employee is first hired by the company
- Every five years, whatever the employee's duties are
- Only after an incident inside a permit space
- Before first duties and whenever duties or hazards change
Question 13 · Single choice · 90s · 1 pt
How often must an in-house permit space rescue team practice a rescue?
- At least once every 12 months
- Only after a real rescue has gone wrong
- At least once every 3 years
- Once, when the team is first formed
Question 14 · True / False · 90s · 1 pt
Ventilating a permit space with forced air eliminates its atmospheric hazard, so the space can always be reclassified as a non-permit space.