Lockout/Tagout Safety Quiz

Practice status

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30 original questions on U.S. general-industry energy control. Choose a role, topic, or difficulty focus. This is unofficial knowledge practice; it does not authorize servicing or replace employer procedures and role-specific training.

Practice focus:

Feedback:

Focuses are alternatives, not combined filters. Difficulty describes conceptual versus applied questions, not a validated ability scale.

Question count:

Source checked 11 September 2026: OSHA 29 CFR 1910.147. Federal general-industry scope; state-plan and employer requirements may differ. Construction, agriculture, maritime, utility installations, electrical Subpart S work, oil/gas well work, and exception determinations are outside this curated bank. No machine-specific steps are provided.

Replay seed (optional):

Leave blank for the standard round. Enter a seed only to choose a reproducible challenge.

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Review what to practice next

This score describes only these practice responses. It is not proof of safe isolation, employer authorization, certification, or workplace competence. Review the applicable employer procedure with your employer’s trainer before covered work.

Missed answer review

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Topic performance

Which energy-control topics need another look? Counts cover only the questions in this round; no unsampled skill is assessed.

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Answer ledger

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A machine can be silent while a compressed spring, trapped pressure or a raised part still presents a serious hazard. Stopping normal movement does not prove that the equipment cannot restart or release stored energy. Lockout/tagout, often shortened to LOTO, addresses those risks during servicing and maintenance by controlling hazardous energy rather than relying on the machine appearing inactive.

Electricity is only one possible energy source. Hydraulic systems use pressurized liquid, pneumatic systems use compressed air or gas, and mechanical parts can retain energy through compression or their position. Heat and chemical energy also matter. Isolating an electrical supply does not, by itself, relieve pressure, restrain a raised member or make a hot part safe to touch.

An energy-isolating device physically prevents energy transmission or release. A suitable disconnect, valve or block serves a different purpose from a push button or selector switch, which belongs to a control circuit. Lockout secures an isolating device in its safe position. Tagout places a warning on the isolation arrangement, but a tag does not provide a lock's physical restraint and is not an interchangeable convenience option.

The employee's duties determine which responsibilities and training apply. Operating a machine every day does not automatically prepare someone to isolate it for maintenance.

Authorized employee: A person who locks out or tags out equipment to perform covered servicing or maintenance. Training must address the relevant energy sources, their type and magnitude, and the methods needed to isolate and control them.
Affected employee: A person whose job involves using equipment being serviced under lockout or tagout, or working in the area where that servicing occurs. Instruction covers the purpose and use of the energy-control procedure.
Other employees: Remaining employees whose work is or may be in an area where energy control is used. They need instruction about the procedure and the prohibition on trying to restart or reenergize locked-out or tagged-out equipment.

Servicing can include cleaning, adjusting, inspecting or clearing a jam, not just a major repair. Calling a task production work does not automatically exclude energy-control requirements when servicing involves bypassing a guard or entering a danger zone. The minor-servicing exception during normal production requires routine, repetitive work that is integral to production and effective alternative protection. A short duration alone does not establish that it applies.

For covered U.S. general-industry work, the employer's energy-control program combines procedures, training and periodic inspections. The procedure must address the actual equipment and hazards, including verification before work and continuity of protection when people or shifts change. A generic poster cannot supply missing isolation points, device responsibilities or verification requirements.

Written knowledge practice is educational, not professional safety advice or proof that machinery is safe. A correct answer cannot authorize servicing, establish zero energy, certify a worker or replace the employer's applicable procedure, role-specific training and required skills.

How to Use This Tool:

Start with a broad sample or focus on a particular energy-control responsibility. The default is five questions from All topics · mixed roles with explanations after each answer.

Choose a Practice focus and an offered Question count. A topic, employee role or difficulty choice selects an alternative question pool; these choices cannot be combined as filters. Selecting an employee role grants no authority to perform that work. Changing focus returns an unsupported count to five.
Choose Explain after each answer to see corrections as you go, or Review at the end to withhold correctness and explanations until the completed review. Both modes record and lock each answer immediately.
Select Start practice when the setup is ready. The optional Replay seed is under Advanced and accepts up to 128 characters. If starting is disabled, correct the focus, feedback or count using the offered choices and keep the seed within that limit.
A blank Replay seed uses the fixed standard round, not a newly randomized round each time. Reusing a seed reproduces a challenge only with the same focus, count, feedback mode and question-bank version.
Select one of the four answers, then use Next question to advance. The selection cannot be changed within that attempt, including after restoring it from a saved address. There is no timer, skip-to-finish path or early final result.
Select View results after answering the last question. Read Missed answer review for incorrect responses and the Answer ledger for every question's answer, explanation and source reference. Use Retry missed to begin a clean attempt on only the questions answered incorrectly.

Interpreting Results:

During a round, Practice status and the progress percentage show how many questions have been answered, not how many are correct. At completion, the headline changes to correct answers out of the selected question count. Perfect round means no mistakes in that attempt, not verified competence or a passing safety qualification. There is no pass mark, readiness band or official examination result.

Topic performance compares counts of Correct and Missed answers from the questions actually selected. An absent topic has not been assessed. Short rounds need not sample all six topics evenly, and Review focus identifies the category with the most misses rather than a validated measure of the weakest skill. Check the missed question's explanation and cited provision, then discuss any uncertainty about actual equipment with the employer's trainer.

Replay same seed repeats the question and option order with cleared answers. Try a new seed changes the challenge seed but may repeat questions, especially in a small pool. All replays start new attempts; they do not revise the completed score or build a cumulative qualification record. Retry missed is absent after a perfect round.

An Unavailable practice status is not a zero score.

Technical Details:

Hazardous-energy control must address both energy arriving from a source and energy remaining in the equipment. The relevant U.S. general-industry standard is issued by the Occupational Safety and Health Administration (OSHA) in Title 29 of the Code of Federal Regulations, section 1910.147. Its requirements distinguish preparation, shutdown, isolation, device application, stored-energy control and verification because completing one does not establish that the others have been completed.

The energy-control sequence

The following sequence summarizes the required elements for covered servicing. It explains the concepts being reviewed, not which disconnects to operate, which supports to fit or how to test a particular machine. Those details must come from the applicable employer procedure.

Conceptual order of energy-control requirements for covered U.S. general-industry servicing
Order	Required element	What it establishes
1	Preparation	The authorized employee understands the energy type, magnitude, hazards and means of control before shutdown.
2	Orderly shutdown	The established shutdown procedure stops the equipment without creating additional or increased hazards.
3	Isolation	All energy-isolating devices needed to control the equipment's energy sources are located and operated.
4	Device application	Authorized employees apply lockout or tagout devices to the energy-isolating devices. Locks hold them in the safe or off position; tags indicate that operation or movement from that position is prohibited.
5	Stored-energy control	All potentially hazardous stored or residual energy is rendered safe through the appropriate relief, disconnection, restraint or other required control.
6	Verification	Before servicing starts, the authorized employee verifies that isolation and deenergization have been accomplished.

When stored energy could accumulate again to a hazardous level, verification must continue until servicing is complete or that possibility no longer exists. The standard does not supply one universal monitoring interval or machine-testing method. A first pressure release, a dark indicator or a motionless mechanism cannot establish that every hazard will remain controlled.

Locks, tags and device condition

The ability to lock an energy-isolating device determines the default control choice. Tagout on a lockable device requires an employer demonstration of equivalent protection, not a worker's judgment that a warning should be sufficient.

Lockout and tagout selection rules based on the capability of the energy-isolating device
Device condition	Required rule
Capable of being locked out	Use lockout unless the employer demonstrates the specified full employee protection with tagout, including all tagout provisions and additional measures needed for safety equivalent to lockout.
Not capable of being locked out	The employer's energy-control program must use a tagout system meeting the applicable requirements. Attaching an arbitrary warning tag does not establish compliance.

Devices designated for energy control must be reserved for that purpose, identify the applying employee and meet durability, standardization and strength requirements. Tags and their attachments must withstand the workplace environment, remain legible and understandable, and resist accidental detachment. A wet or unreadable tag calls for reporting and action through the employer's program, not permission to disregard or remove it.

Program inspection and retraining

Energy-control procedures require inspection at least annually by an authorized employee other than those using the procedure being inspected. Identified deviations or inadequacies must be corrected, and the employer must certify that the inspection occurred. Where lockout is used, the review includes each authorized employee's responsibilities; tagout review also includes affected employees and the limitations of tags.

Retraining has separate triggers. Authorized and affected employees require retraining when assignments change, when equipment or processes introduce a new hazard, or when energy-control procedures change. It is also required when an inspection or other evidence reveals inadequate knowledge or use. An annual procedure inspection is therefore not interchangeable with an annual quiz.

A procedure must identify its scope, intended use, authorization, control steps, device responsibilities and verification requirements. The narrow exception to documenting a particular machine's procedure requires every listed condition in the standard. It is not a general exception from controlling hazardous energy, and a question response cannot determine whether it applies to a workplace.

Coordination, removal and temporary testing

Affected employees must be notified before energy-control devices are applied and after they are removed. Following removal, notification must occur before the machine starts. Before release, the work area and equipment also require checks for nonessential items, intact components and safely positioned or removed employees.

Outside servicing brings responsibilities for both employers. The on-site and outside employers must exchange their respective energy-control procedures, and the on-site employer must ensure its employees understand and comply with the outside program's restrictions.

Group lockout or tagout must provide protection equivalent to personal control, with designated responsibility and coordination. Each authorized employee applies a personal device to the group device, lockbox or comparable arrangement when beginning work and removes it when stopping work on that equipment. Shift and personnel changes need an orderly transfer that maintains protection.

Normally, the employee who applied a device removes it. Removal when that person is unavailable requires employer direction, specific documented procedures and training, and equivalent safety. Safeguards include verifying that the employee is not at the facility, making all reasonable efforts to inform them of removal, and ensuring they know before resuming work there. A deadline, an unanswered call or verbal permission alone does not satisfy those conditions.

Temporary energization for necessary testing or positioning has a controlled sequence. Tools and materials are cleared, employees are removed from the equipment area, devices are removed under the applicable removal requirements, and the equipment is energized for the test or positioning. Before servicing resumes, all systems must be deenergized and energy-control measures reapplied, including the required verification. A successful test does not permit continued energized servicing.

Practice scoring

Each correct response earns one point. An incorrect response earns zero, with no negative marking, unequal weighting, partial credit or time bonus. Total points equal the number correct, while both accuracy and progress use the entire selected round as their denominator.

\begin{array}{l} S = C \\ P = 100 \times \frac{C}{N} \\ G = 100 \times \frac{A}{N} \end{array}

S is the score in points, C is the number correct, A is the number answered, and N is the selected question count. P is accuracy in percent and G is progress in percent. Possible points equal N, so a round's score ranges from zero to N. The counts are integers with 0 ≤ C ≤ A ≤ N and N ≥ 1. Accuracy retains its unrounded ratio. The visible progress label rounds to the nearest whole percent, with half-percent ties upward; the completed headline displays the exact correct-out-of-selected count.

Unanswered questions remain in N during progress, but are neither incorrect answers nor candidates for missed-only retry. A final result requires A to equal N. Retrying missed questions creates a new N based only on the previous attempt's incorrect responses, which can make a retry shorter than the five-question minimum offered in normal setup.

Question coverage and sampling

The 30 independently authored text questions contain five items in each of six topics: employee roles, program review, isolation checks, stored energy, locks and tags, and work coordination. Topic, role and difficulty focuses select from that same bank. The offered round sizes depend on the selected pool.

Available question pools and permitted question counts for ordinary practice setup
Question pool	Available items	Offered round sizes
All topics · mixed roles	30	5, 10, 15, 20, 30
Any one topic	5	5
Authorized employee	13	5, 10, 13
Affected employee	10	5, 10
Other employee	7	5, 7
Foundation concepts	12	5, 10, 12
Applied scenarios	18	5, 10, 15, 18

Selection is seeded and without replacement within a round. Each question retains its own four authored answer choices, with their order determined by the challenge. There is no topic-balancing rule or official exam weighting. Foundation and applied labels distinguish conceptual questions from scenarios, not measured ability levels. Changing the focus, round length or prior exposure to explanations changes what a score can reasonably be compared with; answering all 30 covers this bank, not the whole standard.

Scope and Limitations:

The questions are original, unofficial educational material, not OSHA examination questions or endorsed training.

The curated question bank records a source-check date of 11 September 2026. Its static coverage is selective; that date does not establish a current audit of every question or the full standard.
The subject is U.S. federal general-industry energy control. State-plan requirements and employer procedures may differ. Construction, agriculture, maritime work, installations under exclusive electric-utility control, electrical work governed by Subpart S, and oil and gas well drilling or servicing are outside the bank.
No machine-specific isolation instructions, testing methods, support designs or exception determinations are provided. Actual equipment, the applicable jurisdiction and the employer's current procedure govern covered work.

Privacy Notes:

Scoring runs in your browser, but the page address also preserves the setup, seed, recorded answers and current position. This includes partial attempts. Anyone receiving that address can restore those choices, so keep personal or workplace-sensitive information out of a replay seed. This is not encrypted or private progress storage.

Addresses may enter browser history or be transmitted when loaded or shared. The chart may also require an external resource request, so browser-based scoring is not a guarantee of offline operation or zero transmission. Change setup clears the current attempt and its saved address state, not copies already shared or retained elsewhere. There is no account-based progress record.

A Saved attempt unavailable message means that the saved address could not be restored, for example because it is incompatible with the current question bank or is invalid. Rebuild a round from the setup choices and start again rather than interpreting the failed restoration as a scored attempt.

Worked Examples:

A seven-question round and a two-question retry

Choose Role · Other employee, seven questions and Review at the end. After four answers, progress rounds from 57.142857% to 57%, regardless of how many are correct. Finish with five correct answers and two misses, and Practice status shows 5/7, equivalent to a computed accuracy of approximately 71.43%. Retry missed now starts a fresh two-question attempt. Answering both correctly gives 2/2 for that retry; it does not rewrite the earlier result as 7/7.

A deadline does not authorize lock removal

Choose Topic · Work coordination with Explain after each answer. For the question about an absent lock owner and an approaching deadline, selecting “Any supervisor’s verbal permission alone satisfies the standard” produces a Review correction. The completed Answer ledger records Incorrect and explains the documented employer procedure and safeguards required for exceptional removal. The useful follow-up is to resolve that misconception with the employer's trainer, not to improvise a way to remove the lock.

References:

29 CFR 1910.147 — The control of hazardous energy (lockout/tagout), Occupational Safety and Health Administration.
State Plans' Safety and Health Standards and Regulations, Occupational Safety and Health Administration.