CHST Struck-by and Caught-in/Between Hazards 4

Question 1

Under 1926.302(b)(7), what is required at the air source for pneumatic hoses with an inside diameter greater than ½ inch?

Accepted Answer

A safety device that reduces pressure if the hose fails

Answer

Hoses over ½ inch ID need a safety device at the supply source or branch line to reduce pressure if the hose fails, which prevents hose whip.

Question 2

Under OSHA, compressed air used for cleaning must be reduced to below what pressure?

Accepted Answer

30 psi

Answer

Compressed air for cleaning must be under 30 psi, with effective chip guarding and PPE, to prevent flying-particle injuries.

Question 3

Which nail gun trigger type has the lowest risk of unintended nail discharge?

Accepted Answer

Single sequential actuation trigger

Answer

NIOSH and OSHA report that the full sequential trigger roughly halves acute nail gun injury risk compared with the contact trigger.

Question 4

Which requirement applies to powder-actuated tools under 1926.302(e)?

Accepted Answer

Only employees trained in their operation may use them

Answer

1926.302(e)(1) allows only trained employees to operate powder-actuated tools, and tools must not be loaded until just before use.

Question 5

On a bench grinder, what is the maximum gap between the work rest and the wheel?

Accepted Answer

1/8 inch

Answer

Work rests must be kept within 1/8 inch of the wheel so the workpiece cannot jam between the rest and the wheel.

CHST - Construction Health and Safety Technician Practice Test