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Lockout/Tagout (LOTO) Safety Quiz

12 – 38 Questions 11 min

This Lockout/Tagout Safety Quiz focuses on real maintenance and servicing decisions that control hazardous energy, not just flipping switches. You will work through scenarios on identifying all energy sources, choosing true energy-isolating devices, releasing stored energy, and verifying zero-energy state to strengthen both written procedures and field practice.

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Part 1 — Questions

Answer each question on paper. Do not turn the page until you are ready to check your work.

What is the primary purpose of a lockout/tagout (LOTO) procedure?

Allow any employee to start equipment whenever needed.
Prevent unexpected energization and release of hazardous energy during servicing.
Speed up production by reducing machine downtime.
Eliminate the need for machine guards during normal operation.

Lockout/tagout is used to control hazardous energy during servicing and maintenance that could lead to unexpected startup.

True
False

Which action is an example of energy isolation rather than just equipment shutdown?

Pressing the red stop button on the operator panel.
Placing the main electrical disconnect in the off position and applying a lock.
Switching the HMI to a maintenance screen.
Turning a mode selector switch from automatic to jog.

A packaging line frequently jams, and operators clear the jam by reaching into the danger zone after opening a guard. When is lockout/tagout required?

Never, because jam clearing is a routine production task.
Only if the jam takes more than 30 minutes to clear.
Only when a supervisor is not present.
Whenever clearing the jam exposes a person to hazardous movement or unexpected startup.

OSHA requires periodic inspections of each written lockout/tagout procedure at least annually.

True
False

When may a tagout‑only system (without locks) be used under OSHA’s lockout/tagout standard?

Whenever it is faster than applying locks.
Only when the energy‑isolating device cannot be locked out and additional protective measures are used.
Only for low‑voltage electrical work.
Whenever the authorized employee believes a lock is not necessary.

For cord‑and‑plug equipment under your exclusive control, unplugging the equipment and keeping the plug within your line of sight can satisfy LOTO intent without applying a lock.

True
False

Using an emergency stop button as the point where you apply your lock satisfies lockout/tagout isolation requirements.

True
False

A mechanic has locked and tagged the main electrical disconnect on a hydraulic press, but the pressure gauge on the system still shows 800 psi. What should they do before starting work inside the press?

Attempt a start from the control panel to confirm the press does not move.
Relieve hydraulic pressure using designated bleed or drain points, then recheck the gauge.
Rely on the pressure gauge alone as proof the system is safe.
Proceed with work because the electrical source is locked out.

10.

After locking and tagging out a 480‑volt electrical panel, which verification step is most appropriate before touching exposed conductors?

Use a properly rated meter to test for absence of voltage on the conductors.
Ask a coworker if they also believe the power is off.
Wait a few minutes for any residual voltage to disappear on its own.
Check that indicator lights on the machine are off.

11.

During verification, you should attempt to start the machine while its controls are still in the run or automatic position.

True
False

12.

A crew of four millwrights is replacing a conveyor motor. The main disconnect is locked out with a group hasp. How should personal control of lockout be handled?

Each millwright applies their own lock to the hasp before starting work.
Rely on a single tag listing all four workers without locks.
Use one lock on the hasp labeled with all four names.
Have one lead worker apply and remove all locks for the group.

13.

A machine repair spans two shifts. What is the best way to ensure continuous lockout/tagout protection during the shift change?

Remove all locks at the end of the first shift and reapply them later if needed.
Leave only the supervisor’s lock in place between shifts.
Have the oncoming shift place their locks before the outgoing shift removes theirs.
Allow the supervisor to move locks from one employee’s hasp position to another’s.

14.

Stored or residual energy, such as pressure, gravity, or springs, must be relieved, blocked, or otherwise controlled before servicing begins.

True
False

15.

Which of the following are true energy‑isolating devices suitable for lockout? Select all that apply.

A.A start/stop push‑button station on the control panel.
B.A line valve that fully stops the flow of compressed air to a machine.
C.A manually operated electrical disconnect switch that opens all supply conductors.
D.A PLC program mode that places the machine in maintenance state.
E.A circuit breaker with a lockable handle.

16.

You are locking out a machine that uses electrical power, compressed air, and has a heavy vertically suspended load. Which approach best meets LOTO requirements?

Lock only the main electrical disconnect, since it feeds all controls.
Lock all electrical and pneumatic isolating devices and lower or block the load so it cannot fall.
Tag the machine as out of service and rely on the warning tag for all hazards.
Lock the electrical disconnect and bleed air, but leave the load suspended because power is off.

17.

After locking out a compressor and closing the supply valve to a machine, you see the downstream pressure gauge at 50 psi. What is the most appropriate next step before starting work?

Bleed the downstream air through designated drain points until the gauge reads zero, then verify it holds.
Loosen a fitting slightly to let pressure blow off near your hands.
Assume the closed valve is enough and begin work.
Wait for the gauge to drop on its own over time.

18.

Place these basic phases of a typical lockout/tagout procedure in the correct order.

Put these in the correct order (write 1–6 beside each):

____Control or release stored and residual energy.
____Shut down the equipment using normal stopping controls.
____Notify affected employees and prepare for shutdown.
____Isolate all identified energy sources.
____Perform the servicing or maintenance work.
____Verify zero energy state.

19.

A contractor crew and in‑house maintenance are working together on a large mixer. A group lockbox is used, and the contractor supervisor holds the only key to the isolating device locks. Which practice best maintains personal control for everyone involved?

Allow the contractor supervisor to decide when to remove all locks and restart.
Use tags on the lockbox listing all worker names instead of individual locks.
Have only the in‑house supervisor place a single lock on the lockbox for the entire group.
Require each authorized worker, including contractors, to place their own lock on the group lockbox.

20.

A technician plans to clear a jam inside a guarded conveyor that stops when its interlocked gate is opened. They want to rely on the gate interlock instead of performing full lockout/tagout to save time. What is the best decision?

Use the gate interlock only, since it removes power when opened.
Bypass the interlock so the conveyor cannot restart, then work inside.
Have a coworker hold the emergency stop while the technician clears the jam.
Perform full LOTO because clearing the jam requires entering a danger zone beyond normal guarding.

21.

During a periodic inspection of a machine‑specific LOTO procedure, the inspector notices that workers are skipping the pressure bleed‑down step. What should be the inspector’s primary focus?

Check only that locks and tags are labeled correctly.
Confirm that each authorized employee understands and follows every step of the written procedure, including bleed‑down.
Reduce the number of steps in the procedure so it is faster to complete.
Verify that the procedure is posted near the machine, regardless of how it is followed.

Part 2 — Answer key

Compare your answers after you have finished Part 1.

What is the primary purpose of a lockout/tagout (LOTO) procedure?
Prevent unexpected energization and release of hazardous energy during servicing.
Lockout/tagout is used to control hazardous energy during servicing and maintenance that could lead to unexpected startup.
True
Which action is an example of energy isolation rather than just equipment shutdown?
Placing the main electrical disconnect in the off position and applying a lock.
A packaging line frequently jams, and operators clear the jam by reaching into the danger zone after opening a guard. When is lockout/tagout required?
Whenever clearing the jam exposes a person to hazardous movement or unexpected startup.
OSHA requires periodic inspections of each written lockout/tagout procedure at least annually.
True
When may a tagout‑only system (without locks) be used under OSHA’s lockout/tagout standard?
Only for low‑voltage electrical work.
For cord‑and‑plug equipment under your exclusive control, unplugging the equipment and keeping the plug within your line of sight can satisfy LOTO intent without applying a lock.
True
Using an emergency stop button as the point where you apply your lock satisfies lockout/tagout isolation requirements.
False
A mechanic has locked and tagged the main electrical disconnect on a hydraulic press, but the pressure gauge on the system still shows 800 psi. What should they do before starting work inside the press?
Relieve hydraulic pressure using designated bleed or drain points, then recheck the gauge.
After locking and tagging out a 480‑volt electrical panel, which verification step is most appropriate before touching exposed conductors?
Use a properly rated meter to test for absence of voltage on the conductors.
During verification, you should attempt to start the machine while its controls are still in the run or automatic position.
False
A crew of four millwrights is replacing a conveyor motor. The main disconnect is locked out with a group hasp. How should personal control of lockout be handled?
Have one lead worker apply and remove all locks for the group.
A machine repair spans two shifts. What is the best way to ensure continuous lockout/tagout protection during the shift change?
Allow the supervisor to move locks from one employee’s hasp position to another’s.
Stored or residual energy, such as pressure, gravity, or springs, must be relieved, blocked, or otherwise controlled before servicing begins.
True
Which of the following are true energy‑isolating devices suitable for lockout? Select all that apply.
A line valve that fully stops the flow of compressed air to a machine.; A manually operated electrical disconnect switch that opens all supply conductors.; A circuit breaker with a lockable handle.
You are locking out a machine that uses electrical power, compressed air, and has a heavy vertically suspended load. Which approach best meets LOTO requirements?
Tag the machine as out of service and rely on the warning tag for all hazards.
After locking out a compressor and closing the supply valve to a machine, you see the downstream pressure gauge at 50 psi. What is the most appropriate next step before starting work?
Bleed the downstream air through designated drain points until the gauge reads zero, then verify it holds.
Place these basic phases of a typical lockout/tagout procedure in the correct order.
Correct order: Notify affected employees and prepare for shutdown. → Shut down the equipment using normal stopping controls. → Isolate all identified energy sources. → Control or release stored and residual energy. → Verify zero energy state. → Perform the servicing or maintenance work.
A contractor crew and in‑house maintenance are working together on a large mixer. A group lockbox is used, and the contractor supervisor holds the only key to the isolating device locks. Which practice best maintains personal control for everyone involved?
Require each authorized worker, including contractors, to place their own lock on the group lockbox.
A technician plans to clear a jam inside a guarded conveyor that stops when its interlocked gate is opened. They want to rely on the gate interlock instead of performing full lockout/tagout to save time. What is the best decision?
Have a coworker hold the emergency stop while the technician clears the jam.
During a periodic inspection of a machine‑specific LOTO procedure, the inspector notices that workers are skipping the pressure bleed‑down step. What should be the inspector’s primary focus?
Confirm that each authorized employee understands and follows every step of the written procedure, including bleed‑down.

1What is the primary purpose of a lockout/tagout (LOTO) procedure?

2Lockout/tagout is used to control hazardous energy during servicing and maintenance that could lead to unexpected startup.

True / False

3Which action is an example of energy isolation rather than just equipment shutdown?

4A packaging line frequently jams, and operators clear the jam by reaching into the danger zone after opening a guard. When is lockout/tagout required?

5OSHA requires periodic inspections of each written lockout/tagout procedure at least annually.

True / False

6When may a tagout‑only system (without locks) be used under OSHA’s lockout/tagout standard?

7For cord‑and‑plug equipment under your exclusive control, unplugging the equipment and keeping the plug within your line of sight can satisfy LOTO intent without applying a lock.

True / False

8Using an emergency stop button as the point where you apply your lock satisfies lockout/tagout isolation requirements.

True / False

9A mechanic has locked and tagged the main electrical disconnect on a hydraulic press, but the pressure gauge on the system still shows 800 psi. What should they do before starting work inside the press?

10After locking and tagging out a 480‑volt electrical panel, which verification step is most appropriate before touching exposed conductors?

11During verification, you should attempt to start the machine while its controls are still in the run or automatic position.

True / False

12A crew of four millwrights is replacing a conveyor motor. The main disconnect is locked out with a group hasp. How should personal control of lockout be handled?

13A machine repair spans two shifts. What is the best way to ensure continuous lockout/tagout protection during the shift change?

14Stored or residual energy, such as pressure, gravity, or springs, must be relieved, blocked, or otherwise controlled before servicing begins.

True / False

15Which of the following are true energy‑isolating devices suitable for lockout? Select all that apply.

Select all that apply

16You are locking out a machine that uses electrical power, compressed air, and has a heavy vertically suspended load. Which approach best meets LOTO requirements?

17After locking out a compressor and closing the supply valve to a machine, you see the downstream pressure gauge at 50 psi. What is the most appropriate next step before starting work?

18Place these basic phases of a typical lockout/tagout procedure in the correct order.

Put in order

1Control or release stored and residual energy.

2Shut down the equipment using normal stopping controls.

3Notify affected employees and prepare for shutdown.

4Isolate all identified energy sources.

5Perform the servicing or maintenance work.

6Verify zero energy state.

19A contractor crew and in‑house maintenance are working together on a large mixer. A group lockbox is used, and the contractor supervisor holds the only key to the isolating device locks. Which practice best maintains personal control for everyone involved?

20A technician plans to clear a jam inside a guarded conveyor that stops when its interlocked gate is opened. They want to rely on the gate interlock instead of performing full lockout/tagout to save time. What is the best decision?

21During a periodic inspection of a machine‑specific LOTO procedure, the inspector notices that workers are skipping the pressure bleed‑down step. What should be the inspector’s primary focus?

Disclaimer

This quiz is for educational purposes only. It does not constitute professional advice. Consult a qualified professional for specific guidance.

Frequent Lockout/Tagout Errors That Undermine Hazardous Energy Control

Using Controls Instead of Energy-Isolating Devices

Workers often "lock out" an E‑stop, HMI command, interlock, or selector switch. These are control functions, not isolation points. They can fail or be bypassed. The fix is to apply locks only at true energy-isolating devices such as disconnect switches, breakers, valves, blocks, and mechanical restraints.

Missing Secondary and Stored Energy Sources

Many people isolate the main electrical disconnect, then ignore pneumatic, hydraulic, gravity, thermal, spring, or chemical energy. Another frequent error is skipping bleed down, venting, draining, blocking motion, or discharging capacitors. Trace the system from the point of work outward, list every isolation point, then add explicit steps for relieving and restraining stored energy.

Weak Verification Practices

Some teams assume the presence of locks equals zero energy. Others attempt a start with controls still in the run position. Strong verification uses the right method for the hazard. Use an adequately rated meter for absence of voltage, check pressure at gauges, and only perform tryout after controls are reset to neutral or off.

Poor Group Lockout and Shift Handoffs

Common gaps include one lock "covering" an entire crew or removing locks without direct turnover. Each authorized employee must maintain personal lock control. Use hasps or a group lockbox so every worker applies a personal lock. Build a documented handoff step for shift changes and outside contractors before any lock is removed.

Authoritative References for Lockout/Tagout Hazardous Energy Control

Key Standards and Guidance for Deeper Study

OSHA Standard 1910.147: The Control of Hazardous Energy (Lockout/Tagout): Primary regulatory text that defines scope, responsibilities, required procedures, and training for energy control.
OSHA Control of Hazardous Energy Overview: Topic page that summarizes hazards, program elements, and links to related standards and resources.
OSHA Lockout/Tagout Interactive Training eTool: Scenario based training that mirrors many decisions you will see in real servicing work.
OSHA Publication 3120: Control of Hazardous Energy (Lockout/Tagout): Plain language booklet that walks through required program elements and sample procedures.
NIOSH Hazardous Energy Control Resource Guide: Research based guidance and case studies on preventing lockout/tagout related injuries and fatalities.

Lockout/Tagout Safety Quiz: Detailed FAQ

Common Questions About This Lockout/Tagout Safety Quiz

How does this Lockout/Tagout Safety Quiz relate to OSHA 29 CFR 1910.147?

The scenarios in this quiz mirror the core requirements of OSHA 1910.147. Questions focus on identifying hazardous energy sources, selecting correct energy isolating devices, applying locks and tags, controlling stored energy, and verifying deenergized conditions. Use your results to check how well your decisions match what the standard expects.

What specific skills will this quiz help me assess?

You will assess how accurately you trace multiple energy sources, distinguish shutdown controls from isolation points, choose correct steps for bleed down and blocking motion, and perform verification in the right order. The quiz also highlights your decision making on group lockout, shift changes, and work with outside contractors.

Is this quiz useful if our facility uses written lockout/tagout procedures for each machine?

Yes. The quiz tests whether you can apply procedure style thinking to new equipment and unusual situations. It helps reveal gaps such as missing isolation points, unclear stored energy steps, or weak verification instructions that you may want to correct in your existing procedures.

How should I study if I miss questions about stored or residual energy?

Review examples involving hydraulic accumulators, elevated loads, trapped pneumatic pressure, springs, and thermal energy. Focus on steps that release pressure, block movement, lower or secure loads, and allow systems to stabilize before verification. Then compare that thinking with your facility procedures to confirm the same level of detail.

What other safety topics pair well with this Lockout/Tagout Safety Quiz?

Lockout/tagout interacts with broader safety responsibilities such as hazard recognition and safe work practices. You can Brush Up on OSHA 10 Safety Rules for a wider view of control strategies, and Practice Reading Critical Safety Signs Here to strengthen your response to posted warnings around energy isolation points.