9.4 Control measures for machinery

An interlocking guard:

• 1 Is never opened
• 2 Stops the machine if opened
• 3 Is fixed with tools only
• 4 Is only decorative

A hold-to-run control:

• 1 Is the same as a fixed guard
• 2 Runs the machine for an hour
• 3 Works only while the control is held
• 4 Is an emergency stop

Which is a basic requirement of a guard?

• 1 It must be removed for maintenance
• 2 It should increase risk
• 3 It should restrict the view
• 4 It should not be easily bypassed

A fixed guard is:

• 1 Easily opened by hand during use
• 2 Always interlocked
• 3 Self-adjusting
• 4 Kept in place by tools or fasteners

An adjustable guard is:

• 1 Adjusted to suit the task
• 2 Never moved
• 3 A type of PPE
• 4 Only in offices

The first choice among machine guards is generally a:

• 1 Training session
• 2 Fixed guard
• 3 Warning sign
• 4 PPE

A two-hand control:

• 1 Needs only one hand
• 2 Is a type of PPE
• 3 Keeps the machine running without hands
• 4 Requires the operator's hands to be clear of the danger area to start the machine

A light curtain is an example of:

• 1 A trip device that stops the machine when the beam is broken
• 2 A fixed guard
• 3 PPE
• 4 A jig

A push-stick is used to:

• 1 Keep hands away from a cutting tool
• 2 Increase noise
• 3 Lift people
• 4 Increase vibration

A limitation of guards is that they:

• 1 Can be bypassed
• 2 Never wear out
• 3 Cannot be maintained
• 4 Always remove all risk

A limitation of PPE as a machine control is that it:

• 1 Removes the hazard
• 2 Is always strong enough
• 3 Never fails
• 4 Depends on the user

A guard must:

• 1 Allow maintenance without being removed where possible
• 2 Increase risk
• 3 Be easily bypassed
• 4 Block the operator's view

An emergency stop control:

• 1 Stops the machine quickly when a danger arises
• 2 Starts the machine
• 3 Increases speed
• 4 Replaces guards

A hold-to-run control means that the machine:

• 1 Runs until switched off
• 2 Runs only while the control is held
• 3 Runs without a control
• 4 Never stops

Why should a guard not restrict the operator's view?

• 1 To reduce light
• 2 To increase noise
• 3 To raise the temperature
• 4 The operator needs to see the work to control it safely