OSHA 10-Hour General Industry Outreach (knowledge check)
Machine guarding: practice questions
Our OSHA 10 General Industry bank has 13 questions on this topic. Here are 3 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
How much pressure is allowed for compressed air used for cleaning?
- Up to 90 psi, the normal shop line pressure
- Less than 30 psi, with chip guarding and PPE
- Up to 50 psi without PPE, or 90 psi with safety glasses
- Any pressure, if the air is filtered
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B. Less than 30 psi, with chip guarding and PPE — Compressed air may not be used for cleaning unless reduced to less than 30 psi, and then only with effective chip guarding and PPE.
Question 2
On a bench grinder, what is the maximum gap between the work rest and the wheel?
- 1/8 inch
- 1/4 inch
- 1/2 inch
- 1 inch, so larger parts can be held
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A. 1/8 inch — Work rests on offhand grinding machines must be kept adjusted closely to the wheel with a maximum opening of 1/8 inch.
Question 3
What must be done immediately before mounting an abrasive wheel?
- Wet it in water and run it at double speed for a minute to test it
- Run it at double speed to test it
- Paint the date on it
- Inspect it closely and do a ring test
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D. Inspect it closely and do a ring test — Immediately before mounting, all wheels must be closely inspected and sounded by the user (ring test) to make sure they are not damaged.