Confined space entry practice test cover

Below is a 50-question multiple-choice exam with answers designed for a Confined Space Entry Practice Test (29 CFR 1910.146). The questions cover core Confined Space expected knowledge areas for a complete course.

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50 Multiple Choice Questions

1. What OSHA standard primarily regulates permit-required confined spaces

in general industry?

A. 29 CFR 1910.134

B. 29 CFR 1910.120

C. 29 CFR 1910.146

D. 29 CFR 1926.21

Correct Answer: C. 29 CFR 1910.146

2. A confined space must meet all of the following criteria EXCEPT:

A. Large enough to bodily enter

B. Limited or restricted means of entry or exit

C. Designed for continuous occupancy

D. Not designed for continuous occupancy

Correct Answer: C. Designed for continuous occupancy

3. Which atmospheric condition is considered immediately dangerous to life or

health (IDLH)?

A. Oxygen level of 20.9%

B. Oxygen level below 19.5%

C. Relative humidity above 70%

D. Temperature above 80°F

Correct Answer: B. Oxygen level below 19.5%

4. Which gas is most commonly used to calibrate oxygen sensors?

A. Carbon monoxide

B. Nitrogen

C. Ambient air

D. Hydrogen sulfideCorrect Answer: C. Ambient air

5. Which of the following is considered a hazardous atmosphere?

A. Oxygen concentration of 20.9%

B. Flammable gas above 10% LEL

C. Carbon dioxide at outdoor background levels

D. Normal atmospheric pressure

Correct Answer: B. Flammable gas above 10% LEL

6. What does LEL stand for?

A. Lowest Exposure Limit

B. Lower Explosive Limit

C. Limited Entry Level

D. Low Emission Level

Correct Answer: B. Lower Explosive Limit

7. Which document identifies hazards and controls for confined space entry?

A. Safety Data Sheet

B. Permit-required confined space entry permit

C. Job application

D. OSHA citation log

Correct Answer: B. Permit-required confined space entry permit

8. What is the primary purpose of ventilation during confined space entry?

A. Reduce noise

B. Increase humidity

C. Control atmospheric hazards

D. Improve lighting

Correct Answer: C. Control atmospheric hazards

9. Which role is responsible for monitoring entrants outside the confined

space?A. Competent person

B. Safety director

C. Attendant

D. Contractor

Correct Answer: C. Attendant

10. Which of the following spaces is MOST likely to be considered permit-

required?

A. Office hallway

B. Storage tank

C. Parking lot

D. Conference room

Correct Answer: B. Storage tank

11. What is the acceptable oxygen range for confined space entry?

A. 10%–15%

B. 15%–18%

C. 19.5%–23.5%

D. 24%–28%

Correct Answer: C. 19.5%–23.5%

12. Which gas is commonly associated with sewer confined spaces?

A. Helium

B. Hydrogen sulfide

C. Neon

D. Argon

Correct Answer: B. Hydrogen sulfide

13. Which hazard category includes engulfment?

A. Mechanical hazard

B. Atmospheric hazard

C. Physical hazard

D. Biological hazardCorrect Answer: C. Physical hazard

14. What should occur before an entrant enters a permit space?

A. Lunch break

B. Atmospheric testing

C. Fire watch assignment only

D. Forklift inspection

Correct Answer: B. Atmospheric testing

15. Atmospheric testing should generally be performed in what order?

A. Toxics, oxygen, combustibles

B. Combustibles, oxygen, toxics

C. Oxygen, combustibles, toxics

D. Oxygen, toxics, combustibles

Correct Answer: C. Oxygen, combustibles, toxics

16. Which device is commonly used to monitor atmospheric conditions?

A. Sound level meter

B. Gas detector

C. Hygrometer

D. Lux meter

Correct Answer: B. Gas detector

17. Which of the following is an example of engulfment?

A. Loud noise exposure

B. Contact with rotating equipment

C. Being buried in grain

D. Slippery floor surfaces

Correct Answer: C. Being buried in grain

18. Entry permits must be canceled when:A. The weather changes

B. Work shifts change

C. Entry operations are completed

D. Ventilation is operating properly

Correct Answer: C. Entry operations are completed

19. Which employee has the authority to terminate entry operations?

A. Entrant only

B. Attendant only

C. Entry supervisor

D. Visitor

Correct Answer: C. Entry supervisor

20. What is the primary duty of an authorized entrant?

A. Supervise contractors

B. Enter and perform assigned work safely

C. Calibrate monitors

D. Approve permits

Correct Answer: B. Enter and perform assigned work safely

21. Which hazard may result from welding inside a confined space?

A. Increased oxygen

B. Toxic fumes

C. Reduced lighting only

D. Excess humidity only

Correct Answer: B. Toxic fumes

22. Lockout/tagout procedures help control:

A. Atmospheric hazards only

B. Engulfment hazards only

C. Hazardous energy sources

D. Ventilation rates

Correct Answer: C. Hazardous energy sources

23. Rescue personnel must be:

A. Located in another state

B. Untrained contractors

C. Properly trained and equipped

D. Optional for permit spaces

Correct Answer: C. Properly trained and equipped

24. Continuous atmospheric monitoring is recommended when:

A. Hazards may change during entry

B. Outdoor work is performed

C. Employees are on lunch break

D. Lighting is sufficient

Correct Answer: A. Hazards may change during entry

25. Which communication method may be used between entrant and

attendant?

A. Hand signals

B. Radios

C. Voice communication

D. All of the above

Correct Answer: D. All of the above

26. Which of the following is NOT a confined space hazard?

A. Toxic atmosphere

B. Engulfment

C. Rotating machinery

D. Proper illumination

Correct Answer: D. Proper illumination

27. Which condition may increase fire risk in a confined space?A. Low humidity

B. Flammable vapors

C. Increased ventilation

D. Oxygen deficiency only

Correct Answer: B. Flammable vapors

28. What is the purpose of isolation procedures?

A. Increase productivity

B. Prevent hazard introduction into the space

C. Improve lighting

D. Reduce paperwork

Correct Answer: B. Prevent hazard introduction into the space

29. What does “entry” mean under OSHA confined space rules?

A. Standing near the opening

B. Breaking the plane of the opening

C. Completing work paperwork

D. Installing ventilation equipment

Correct Answer: B. Breaking the plane of the opening

30. Which type of ventilation pushes fresh air into a space?

A. Local exhaust

B. Negative pressure ventilation

C. Forced-air ventilation

D. Passive diffusion

Correct Answer: C. Forced-air ventilation

31. What is the primary concern with oxygen-enriched atmospheres?

A. Reduced visibility

B. Increased corrosion

C. Increased fire and explosion risk

D. Increased humidity

Correct Answer: C. Increased fire and explosion risk

32. Confined space permits should include:

A. Authorized entrants

B. Hazards of the space

C. Required controls

D. All of the above

Correct Answer: D. All of the above

33. Which of the following may create toxic atmospheres in confined spaces?

A. Cleaning solvents

B. Welding operations

C. Decomposition of organic matter

D. All of the above

Correct Answer: D. All of the above

34. Which employee verifies acceptable entry conditions?

A. Visitor

B. Entry supervisor

C. Delivery driver

D. Accountant

Correct Answer: B. Entry supervisor

35. What should happen if an alarm sounds during entry?

A. Continue work briefly

B. Ignore if readings appear normal

C. Exit the space immediately

D. Silence the alarm

Correct Answer: C. Exit the space immediately

36. What is a non-permit confined space?

A. A space with no actual or potential hazards capable of causing death or serious harm

B. Any underground spaceC. Any permit-required space

D. A space containing flammable gases

Correct Answer: A. A space with no actual or potential hazards capable of causing death or

serious harm

37. Which atmospheric hazard is colorless and odorless?

A. Hydrogen sulfide

B. Chlorine

C. Carbon monoxide

D. Ammonia

Correct Answer: C. Carbon monoxide

38. Which of the following may be used for non-entry rescue?

A. Retrieval line

B. Winch system

C. Tripod

D. All of the above

Correct Answer: D. All of the above

39. Why must attendants remain outside the permit space?

A. To complete paperwork

B. To monitor and assist entrants

C. To supervise contractors only

D. To operate ventilation equipment only

Correct Answer: B. To monitor and assist entrants

40. Which type of hazard involves moving mechanical parts?

A. Atmospheric hazard

B. Engulfment hazard

C. Mechanical hazard

D. Biological hazard

Correct Answer: C. Mechanical hazard

41. Confined spaces may be found in:

A. Silos

B. Vaults

C. Pipelines

D. All of the above

Correct Answer: D. All of the above

42. Which atmospheric condition can impair judgment and coordination?

A. Oxygen deficiency

B. Proper ventilation

C. Normal humidity

D. Stable temperature

Correct Answer: A. Oxygen deficiency

43. A permit-required confined space may contain:

A. Hazardous atmosphere

B. Engulfment hazards

C. Internal configuration hazards

D. All of the above

Correct Answer: D. All of the above

44. What should be done before removing an entry permit from service?

A. Review and cancel it properly

B. Destroy monitoring equipment

C. Ignore documentation

D. Leave the space unsecured

Correct Answer: A. Review and cancel it properly

45. Which atmospheric testing result requires immediate evacuation?

A. Oxygen at 20.9%

B. Combustible gas at 0% LELC. Hydrogen sulfide above acceptable limits

D. Fresh air ventilation operating

Correct Answer: C. Hydrogen sulfide above acceptable limits

46. What is the purpose of a confined space training program?

A. Increase paperwork

B. Ensure employees understand hazards and controls

C. Eliminate all permits

D. Replace rescue teams

Correct Answer: B. Ensure employees understand hazards and controls

47. Which of the following may introduce hazards into a confined space?

A. Welding

B. Solvent use

C. Combustion engines

D. All of the above

Correct Answer: D. All of the above

48. Rescue drills should be conducted:

A. Only after incidents

B. Periodically to maintain proficiency

C. Once every ten years

D. Only during inspections

Correct Answer: B. Periodically to maintain proficiency

49. Which piece of equipment helps retrieve entrants without entering the

space?

A. Ladder

B. Fire extinguisher

C. Tripod and winch

D. Barricade tape

Correct Answer: C. Tripod and winch

50. The ultimate goal of a confined space entry program is to:

A. Reduce permit paperwork

B. Eliminate atmospheric testing

C. Prevent injury, illness, and fatalities

D. Increase production speed

Correct Answer: C. Prevent injury, illness, and fatalities

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