RIIWHS202E Isolation and Lockout/Tagout Procedures

Question 1

What is the primary purpose of isolating energy sources before entering a confined space?

Accepted Answer

To prevent accidental activation of equipment that could endanger entrants

Answer

To reduce noise levels inside the space

Answer

To allow atmospheric testing to be completed faster

Answer

To comply with entry permit paperwork requirements

Question 2

Under Australian WHS regulations, which of the following is the most reliable method of isolating a mechanical hazard in a confined space?

Accepted Answer

Physical disconnection or blanking of the energy source with lockout applied

Answer

Placing a 'Do Not Operate' sign on the control panel

Answer

Notifying the supervisor verbally that the equipment is off

Answer

Switching off the equipment at the local isolator only

Question 3

What does the term 'positive isolation' mean in the context of confined space entry?

Accepted Answer

Physically separating the energy source so it cannot be reconnected without deliberate action

Answer

Confirming that all workers are in a positive frame of mind before entry

Answer

Using a positive pressure air supply inside the space

Answer

Testing the atmosphere and getting a positive result

Question 4

When multiple workers are entering a confined space under a single isolation, each worker should:

Accepted Answer

Apply their own personal lock to the lockout device

Answer

Share one lock between them to avoid crowding the lockout point

Answer

Trust that the supervisor's lock provides adequate protection for everyone

Answer

Wait outside until the lead worker has verified isolation is complete

Question 5

A 'blanking plate' or 'blind flange' is used in confined space isolation primarily to:

Accepted Answer

Physically seal a pipe or duct to prevent the flow of substances into the space

Answer

Block the entry point to prevent unauthorised access

Answer

Support structural elements inside the confined space

Answer

Hold atmospheric monitoring equipment in position

Question 6

Before removing an isolation lock at the end of confined space work, the responsible person must first:

Accepted Answer

Confirm all workers have exited and are accounted for

Answer

Inform the next shift supervisor of the work completed

Answer

Complete the post-entry cleaning requirements

Answer

Request approval from the site safety officer

Question 7

Which Australian Standard provides guidance on the isolation of plant and equipment in the context of hazardous energy control?

Accepted Answer

AS/NZS 4024.1604 – Safety of Machinery: Design of Controls for Isolation of Energy

Answer

AS 1940 – Storage and Handling of Flammable Liquids

Answer

AS 1668 – The Use of Ventilation and Airconditioning in Buildings

Answer

AS 4332 – The Storage and Handling of Gases in Cylinders