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Quizzes > Health & Medicine

OSHA confined space quiz: Practice entry steps, hazards, and roles

Quick, free confined space practice test. Instant results and OSHA-aligned tips.

Editorial: Review CompletedCreated By: Lauren MillerUpdated Aug 24, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art style hard hat, oxygen gauge, safety manual, attendant radio on coral background for confined space quiz

Use this OSHA confined space quiz to check your understanding of entry steps, oxygen levels, and attendant duties with quick, scenario-style questions. When you are done, try the confined space practice test for another round, and strengthen your basics with the osha ppe quiz and the osha hazard communication quiz.

Which definition best describes a confined space under OSHA standards?
Any space with mechanical hazards.
Any workspace where chemicals are used exclusively.
An area large enough for a worker to enter but with limited entry/exit and not designed for continuous occupancy.
A room designed for regular employee use.
OSHA defines a confined space as one that is large enough for a person to enter, has limited means of entry or exit, and is not designed for continuous occupancy. This classification helps employers identify hazards and implement safety measures. Permitting and monitoring requirements stem from this core definition.
Which OSHA regulation specifically covers permit-required confined spaces in general industry?
29 CFR 1910.146
29 CFR 1910.134
29 CFR 1910.22
29 CFR 1926.1200
OSHA's 29 CFR 1910.146 lays out the requirements for permit-required confined spaces in general industry. It details employer responsibilities such as hazard evaluation, training, permit systems, and rescue procedures. Other parts of 1910 cover different topics like respiratory protection or housekeeping.
What is the minimum acceptable oxygen concentration for safe entry into a confined space?
21%
19.5%
25%
16%
OSHA requires a minimum oxygen level of 19.5% by volume for safe entry into confined spaces. Levels below this can result in dizziness, unconsciousness, or death. Normal atmospheric oxygen concentration is approximately 21%, so 19.5% is the OSHA cutoff.
Who is responsible for authorizing entry into a permit-required confined space by signing the entry permit?
Entry Supervisor
Site Safety Manager
Attendant
Authorized Entrant
The entry supervisor is the person designated to verify that all pre-entry precautions are in place and to sign the confined space entry permit. They ensure hazards are identified, controls are implemented, and the permit is voided after entry. Attendants and entrants have other specific duties but cannot sign the permit.
Which of the following is considered an atmospheric hazard in a confined space?
Oxygen deficiency
Excessive noise
Poor lighting
Slippery floor
Atmospheric hazards in confined spaces include oxygen deficiency, toxic gases, and flammable atmospheres. Physical hazards such as slippery floors or noise are serious but are not atmospheric. Continuous gas monitoring is critical to detect these hazards before and during entry.
Which piece of personal protective equipment (PPE) is essential for non-entry rescue readiness in confined spaces?
Hearing protection
Full-body harness with retrieval line
Chemical-resistant suit
Standard safety glasses
A full-body harness with a retrieval line allows rescuers to extract a worker without entering the confined space. This non-entry rescue method significantly reduces risk to rescue personnel. Other PPE may be required based on hazards, but a retrieval system is critical for emergency response.
What is the primary duty of an attendant stationed outside a permit-required confined space?
Complete the permit paperwork.
Operate machinery inside the space.
Enter the space to perform maintenance tasks.
Monitor conditions, keep communication with entrants, and initiate rescue if needed.
The attendant's main responsibility is to remain outside, monitor hazards and conditions inside the confined space, maintain continuous communication with entrants, and call for rescue if an emergency occurs. They must not enter the space themselves except to conduct a non-entry rescue using retrieval equipment.
Which method is most effective for controlling airborne contaminants in a confined space?
Opening the access hatch only
Local exhaust ventilation
Personal air purifier
Using no controls and relying on time limits
Local exhaust ventilation removes contaminants at the source and prevents them from spreading through the confined space. General ventilation may dilute hazards but is less effective for toxic or flammable gases. Personal air purifiers are not a substitute for proper ventilation controls.
If you ventilate a 5,000 cubic foot confined space at 500 cubic feet per minute (cfm), approximately how many minutes are needed for one complete air turnover?
1 minute
5 minutes
20 minutes
10 minutes
Air turnover time is calculated by dividing the space volume by the ventilation rate: 5,000 cubic feet รท 500 cfm = 10 minutes for one complete exchange. Ensuring proper turnover is critical to reduce atmospheric hazards. Repeated turnovers may be required depending on contaminant levels.
An atmosphere above the upper explosive limit (UEL) indicates which condition?
Is the ideal mixture for ignition.
Indicates oxygen deficiency only.
Too fuel-rich to ignite.
Cannot support combustion due to low fuel.
When vapor concentration exceeds the UEL, it is too rich (excess fuel) to ignite because there isn't enough oxygen to sustain combustion. Below the lower explosive limit (LEL) is too lean to ignite. Safe work practices avoid both extremes.
According to OSHA, how long is a confined space entry permit typically valid once issued?
8 hours
24 hours
Until space is reclassified
72 hours
OSHA permits must specify an expiration time, commonly not exceeding 24 hours, after which they become void. This ensures conditions are re-evaluated frequently. Employers may set shorter periods based on hazard assessment.
Which lockout/tagout step prevents stored energy from accidentally releasing during confined space operations?
Posting warning signs only.
Isolating and de-energizing all energy sources.
Draining hydraulic reservoirs only.
Securing ladders into the space.
Lockout/tagout procedures require isolating and de-energizing all sources of energy, including electrical, hydraulic, pneumatic, and stored energy. This step prevents accidental startup or release of energy that could harm workers. Draining alone may not address all energy forms.
What is the preferred rescue method for emergencies in permit-required confined spaces?
Entry rescue by additional entrants.
Self-rescue with hand signals only.
Non-entry rescue using a retrieval system.
Remote-controlled robotic rescue.
Non-entry rescue, which uses a pre-attached retrieval system or harness, is OSHA's preferred method because it minimizes risk to rescuers. Entry rescue exposes rescuers to the same hazards the entrants face. Employers must ensure non-entry rescue is feasible before allowing entry.
If hydrogen sulfide (H?S) levels reach 10 ppm in a confined space, what immediate action should be taken?
Continue work since 10 ppm is below the STEL.
Evacuate and do not re-enter until levels are zero.
Switch to half-face respirators immediately.
Increase ventilation and reassess levels before entry.
OSHA's action level for H?S is 10 ppm; reaching this level requires controls such as increased ventilation and re-evaluation. Immediate evacuation is reserved for higher, IDLH concentrations. Respiratory protection decisions depend on the updated monitoring results.
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Study Outcomes

  1. Understand core confined space safety principles -

    Gain foundational knowledge of confined space hazards, entry procedures, and safety controls by engaging with targeted quiz questions.

  2. Apply OSHA protocols for confined space entry -

    Use real-world scenarios to reinforce proper permit requirements, ventilation methods, and lockout/tagout procedures in compliance with OSHA standards.

  3. Identify attendant duties and responsibilities -

    Learn to distinguish the critical roles of attendants, entrants, and supervisors to ensure continuous monitoring and communication during confined space work.

  4. Analyze oxygen level monitoring techniques -

    Interpret air quality readings and select appropriate detection equipment to maintain safe oxygen concentrations within confined spaces.

  5. Evaluate emergency response procedures -

    Test your understanding of rescue plans, communication protocols, and first-response actions to improve readiness for confined space incidents.

  6. Improve overall safety compliance -

    Identify gaps in your confined space safety knowledge and adopt best practices to enhance workplace safety culture and regulatory adherence.

Cheat Sheet

  1. Atmospheric Monitoring Fundamentals -

    Review OSHA's 29 CFR 1910.146 guidelines on oxygen levels (19.5 - 23.5% is safe) and ensure no toxic gas exceeds its PEL or STEL. Use a calibrated multi-gas meter and remember the mnemonic "O2 19 to stay alive, 23 to thrive" when taking a confined space safety quiz or industrial safety test.

  2. Understanding Permit-Required Confined Spaces -

    Memorize the six permit elements: hazards, measures, entry duration, equipment, rescue plan, and authorized personnel (HE MRDA), as outlined by ANSI/ASSP Z117.1. This checklist helps you ace confined space entry questions in an online safety protocol quiz by ensuring every permit-required space is identified and controlled.

  3. Attendant Duties and Communication Protocols -

    According to NIOSH research, attendants must maintain constant voice or radio contact and never enter the space themselves. Practice the ABC mnemonic - Alert, Broadcast, Call rescue - to reinforce proper response steps during a safety compliance quiz or confined space safety quiz scenario.

  4. Recognizing and Controlling Hazardous Energy -

    Follow OSHA 29 CFR 1910.147 lockout/tagout procedures to isolate electrical, mechanical, hydraulic, and pneumatic sources before entry. Recall "SHARP": Sequence steps, Hazard identification, Authorized personnel, Removal of energy, Protect against re-energization, useful for both training and industrial safety test prep.

  5. Emergency and Rescue Planning Essentials -

    Design rescue plans per NFPA 350, include non-entry retrieval gear like a full-body harness and mechanical winch, and practice drills regularly. When you tackle confined space entry questions, remember the three phases: Detect, Analyze, Respond (DAR) to demonstrate mastery in a safety compliance quiz.

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