STSC Tool and Equipment Safety 5

Question 1

A supervisor notices a worker using an electric drill with a two-prong plug instead of a three-prong grounded plug. What should the supervisor do?

Accepted Answer

Stop work immediately and replace the tool with a properly grounded one

Answer

Ungrounded power tools pose an electrocution hazard and must be removed from service and replaced with properly grounded or double-insulated tools.

Question 2

What does the color-coding system for abrasive grinding wheels primarily indicate?

Accepted Answer

The wheel's bond type, grit, and maximum operating speed

Answer

Grinding wheel markings identify the abrasive type, grit size, grade, structure, and bond type, along with the maximum RPM the wheel can safely handle.

Question 3

Which condition makes it UNSAFE to use a chain hoist or come-along for lifting?

Accepted Answer

The chain links are stretched or deformed

Answer

Stretched or deformed chain links indicate overloading or damage that compromises the lifting capacity and can lead to sudden failure under load.

Question 4

Under OSHA 29 CFR 1926, which hand tool is NOT required to be kept free of mushroomed heads?

Accepted Answer

Pliers

Answer

Pliers do not develop mushroomed heads; however, struck tools like chisels, drift pins, and star drills must have mushroomed heads dressed or replaced to prevent fragment ejection.

Question 5

What is the minimum safe distance a worker should maintain from a powder-actuated tool discharge when it is being operated by another worker?

Accepted Answer

10 feet

Answer

OSHA and manufacturer guidelines specify that workers must stay at least 10 feet away from the muzzle direction of a powder-actuated tool being fired.

(STSC) Safety Trained Supervisor Construction Practice Test

(STSC) Safety Trained Supervisor Construction Practice Test

STSC Tool and Equipment Safety 5