Confined Space Awareness Course 2026

1. Pregunta 1 de 25

   Which of these is part of the general definition of a confined space?

   • AIt is not built for people to stay in
   • BIt is always smaller than a car
   • CIt has no openings of any kind
   • DIt is always found below ground level
   Ver respuesta

   Respuesta: A. It is not built for people to stay in

   A confined space is not designed for continuous human occupancy, has limited entry or exit, and can be hazardous.

2. Pregunta 2 de 25

   Is a confined space always small?

   • ANo, but it is always underground
   • BYes, it is smaller than a closet
   • CYes, it fits only one person
   • DNo, it can be large, like a silo
   Ver respuesta

   Respuesta: D. No, it can be large, like a silo

   CCOHS notes that a confined space, despite its name, is not necessarily small. Silos and tanks can be very large.

3. Pregunta 3 de 25

   Which of these is most likely to be a confined space?

   • AA machine shop
   • BA storage tank
   • CAn office
   • DA walk-in freezer
   Ver respuesta

   Respuesta: B. A storage tank

   Storage tanks are confined spaces. Ontario's guideline says offices, shops and walk-in freezers are designed for occupancy.

4. Pregunta 4 de 25

   Normal air contains about how much oxygen?

   • A30%
   • B21%
   • C15%
   • D50%
   Ver respuesta

   Respuesta: B. 21%

   Normal air is about 21% oxygen. Lower levels can cause collapse and death.

5. Pregunta 5 de 25

   Under Ontario's confined spaces rules, oxygen outside which range is an atmospheric hazard?

   • A15% to 19.5%
   • B19.5% to 23%
   • C25% to 30%
   • D10% to 15%
   Ver respuesta

   Respuesta: B. 19.5% to 23%

   Ontario treats oxygen below 19.5% or above 23% by volume as an atmospheric hazard.

6. Pregunta 6 de 25

   Why should you never use pure oxygen to freshen the air in a confined space?

   • AOxygen is far too costly to use this way
   • BOxygen makes the space far too cold
   • COxygen makes gas detectors stop working
   • DExtra oxygen makes fires far more likely
   Ver respuesta

   Respuesta: D. Extra oxygen makes fires far more likely

   Too much oxygen greatly increases the risk of fire and explosion. CCOHS says never substitute oxygen for fresh air.

7. Pregunta 7 de 25

   Nitrogen, argon and carbon dioxide can be deadly in a confined space. Why?

   • AThey push out oxygen
   • BThey are extremely loud
   • CThey are always burning
   • DThey make floors slippery
   Ver respuesta

   Respuesta: A. They push out oxygen

   These simple asphyxiants displace oxygen. Unconsciousness or death can follow within minutes.

8. Pregunta 8 de 25

   Which toxic gas does CCOHS name as a confined space hazard?

   • AHydrogen sulphide
   • BClean, fresh air
   • CPlain water vapour
   • DHelium gas
   Ver respuesta

   Respuesta: A. Hydrogen sulphide

   CCOHS gives hydrogen sulphide and carbon monoxide as examples of toxic gases in confined spaces.

9. Pregunta 9 de 25

   What is engulfment?

   • ASlipping on a wet ladder rung
   • BGetting lost inside a long dark tunnel
   • CBeing cut by moving machine parts
   • DBeing buried by grain, sand or liquid
   Ver respuesta

   Respuesta: D. Being buried by grain, sand or liquid

   Engulfment means being trapped or buried by shifting or collapsing bulk material, or by flooding liquid.

10. Pregunta 10 de 25

    Why is a problem inside a confined space more dangerous than the same problem in an open room?

    • APhones and radios never work inside
    • BThe floor is always wet and slippery
    • CEscape and rescue are much harder
    • DThe lighting is always switched off
    Ver respuesta

    Respuesta: C. Escape and rescue are much harder

    There is less margin for error, rescue and self-rescue are harder, ventilation is poor and conditions can change quickly.

11. Pregunta 11 de 25

    Where should the air in a confined space first be tested?

    • AFrom outside, before anyone enters
    • BAt the entrance after work starts
    • CFrom the nearest office window
    • DFrom inside, after the first worker enters
    Ver respuesta

    Respuesta: A. From outside, before anyone enters

    Air should be tested from outside the space before anyone enters.

12. Pregunta 12 de 25

    In BC, pre-entry air testing must be done no more than how long before a worker enters?

    • A24 full hours
    • B8 hours
    • C20 minutes
    • D2 hours
    Ver respuesta

    Respuesta: C. 20 minutes

    BC's OHS Regulation s. 9.25 requires testing to be completed not more than 20 minutes before entry.

13. Pregunta 13 de 25

    Under Ontario's guideline, cold work (no sparks or flames) may be done only if flammable gas is below what level?

    • A75% of the LEL
    • B100% of the LEL
    • C10% of the LEL
    • D50% of the LEL
    Ver respuesta

    Respuesta: C. 10% of the LEL

    Ontario's decision chart allows cold work below 10% of the lower explosive limit; hot work needs less than 5%.

14. Pregunta 14 de 25

    In Ontario, at what flammable gas level is entry into a confined space not allowed at all?

    • A5% of the LEL or more
    • B25% of the LEL or more
    • CEntry is always allowed
    • D1% of the LEL or more
    Ver respuesta

    Respuesta: B. 25% of the LEL or more

    Ontario's guideline allows inspection only below 25% of the LEL. At 25% or more, entry is not permitted.

15. Pregunta 15 de 25

    What does LEL stand for in air testing?

    • ALow-energy lockout level
    • BLowest entry level
    • CLegal exposure limit
    • DLower explosive limit
    Ver respuesta

    Respuesta: D. Lower explosive limit

    Flammable gas readings are given as a percentage of the lower explosive limit (LEL).

16. Pregunta 16 de 25

    In Ontario, how often must a new entry permit be issued?

    • AOnce each year for every space
    • BOnce for the whole life of the building
    • CEach time work is done in the space
    • DOnly when a new worker is hired
    Ver respuesta

    Respuesta: C. Each time work is done in the space

    Ontario's regulation (s. 10) requires a separate entry permit each time work is to be performed in a confined space.

17. Pregunta 17 de 25

    Which item must an Ontario entry permit include?

    • AThe results of the air tests
    • BThe cost of the rescue equipment
    • CThe workers' home phone numbers
    • DThe forecast for the next week
    Ver respuesta

    Respuesta: A. The results of the air tests

    The permit lists the location, work, hazards and controls, time period, attendant, entries and exits, equipment and atmospheric test results.

18. Pregunta 18 de 25

    Where must the attendant be during a confined space entry in Ontario?

    • AOutside and near the entrance
    • BAt the front gate
    • CInside the space with the workers
    • DIn the site office
    Ver respuesta

    Respuesta: A. Outside and near the entrance

    Ontario's guideline says the attendant stays outside and near the entrance and does not enter.

19. Pregunta 19 de 25

    A worker inside collapses. The attendant is alone at the entrance. What should the attendant do?

    • AClose the cover to trap the gas inside
    • BGo in at once to pull them out
    • CStay outside and call for rescue
    • DWait to see if they wake up
    Ver respuesta

    Respuesta: C. Stay outside and call for rescue

    The attendant must not enter. They call for emergency rescue right away, keep communication and support the rescue.

20. Pregunta 20 de 25

    According to CCOHS, about what share of confined space deaths are would-be rescuers?

    • AAbout 25%
    • BWell under 1% of them
    • CAbout 5% at most
    • DAbout 60% or more
    Ver respuesta

    Respuesta: D. About 60% or more

    CCOHS reports that more than 60% of confined space deaths are would-be rescuers.

21. Pregunta 21 de 25

    In Ontario, what must be in place before anyone enters a confined space?

    • AOnly a phone for calling 911
    • BA visitor sign-in sheet at the gate
    • CA ready on-site rescue plan
    • DA first aid poster on the wall
    Ver respuesta

    Respuesta: C. A ready on-site rescue plan

    Ontario (s. 11) requires written on-site rescue procedures ready for immediate use and enough trained rescuers before entry. Calling 911 alone does not count.

22. Pregunta 22 de 25

    In BC, in a low or moderate hazard confined space, a standby person must check on the workers inside at least how often?

    • AOnly at the very end
    • BEvery 20 minutes
    • CEvery 2 hours
    • DOnce per shift
    Ver respuesta

    Respuesta: B. Every 20 minutes

    BC's OHS Regulation (ss. 9.34 and 9.35) requires checks at least every 20 minutes in low and moderate hazard spaces. In high hazard spaces the standby person must monitor the workers continuously.

23. Pregunta 23 de 25

    Under Ontario's rules, how must entrances be handled if unauthorized entry is possible?

    • APainted a bright colour only
    • BSecured, or barricaded and signed
    • CLeft open to let in fresh air
    • DWatched by a camera, nothing more
    Ver respuesta

    Respuesta: B. Secured, or barricaded and signed

    Ontario (s. 17) requires each entrance to be secured, or to have adequate barricades, warning signs or both.

24. Pregunta 24 de 25

    Before a confined space is closed up after work, what must be checked?

    • AThat the permit is thrown away
    • BThat the lights are turned off
    • CThat the gas detector is charging
    • DThat no one is still inside
    Ver respuesta

    Respuesta: D. That no one is still inside

    CCOHS says no confined space should be closed off until it has been verified that no person is inside.

25. Pregunta 25 de 25

    Under Ontario's regulation, who must receive adequate training?

    • AEntrants, attendants and rescuers
    • BOnly the local fire department
    • COnly the supervisor who signs off
    • DOnly the workers who go inside
    Ver respuesta

    Respuesta: A. Entrants, attendants and rescuers

    Ontario (s. 8) requires adequate training for every worker who enters a confined space or does related work, such as attendants and rescuers.

Teclado: 1–4 para responder, Intro para la siguiente pregunta.