NCCER CORE Power Tool Safety and Operation Questions and Answers

Question 1

A worker is operating a bench grinder to sharpen a chisel. According to OSHA standards, what is the maximum allowable gap between the work rest and the face of the grinding wheel?

Accepted Answer

1/8 inch

Answer

OSHA standard 1910.215 requires that the work rest on a bench grinder be kept adjusted closely to the wheel with a maximum opening of 1/8 inch. This is to prevent the workpiece from being jammed between the wheel and the rest, which could cause wheel breakage and injury.

Question 2

When operating a pneumatic nailer, which of the following actions is a critical safety practice that must be performed before attempting to clear a jam or perform any maintenance?

Accepted Answer

Disconnect the tool from the air supply

Answer

Before performing any service, such as clearing a jam or changing accessories on a pneumatic tool, the user must first disconnect it from the air supply. This prevents accidental actuation of the tool, which could cause serious injury.

Question 3

Which of the following is an unsafe practice when using an electric power tool with a cord?

Accepted Answer

Carrying the tool by its cord

Answer

Never carry a power tool by its cord. This can put stress on the cord and its connection to the tool, potentially damaging the wiring and creating an electrical hazard. Always carry the tool by its handle.

Question 4

A construction worker is preparing to use a powder-actuated tool to fasten a steel track to a concrete wall. What is a fundamental safety rule specific to operating this type of tool?

Accepted Answer

The tool must be held firmly against the work surface and perpendicular to it.

Answer

Powder-actuated tools must be held firmly against and perpendicular to the work surface. This ensures the fastener drives straight into the material and minimizes the risk of ricochet or the fastener passing completely through the material.

Question 5

A worker is using a circular saw to cut plywood. The blade guard is wedged open and does not spring back to cover the blade after a cut. What is the correct course of action?

Accepted Answer

Remove the saw from service immediately and tag it as 'Do Not Use'.

Answer

If any safety guard on a power tool is damaged or not functioning correctly, the tool must be removed from service immediately. A tag indicating that the tool is unsafe should be attached to prevent others from using it until it is properly repaired by a qualified person.

NCCER Core - National Center for Construction Education and Research Core Certification Practice Test

NCCER Core - National Center for Construction Education and Research Core Certification Practice Test

NCCER CORE Power Tool Safety and Operation Questions and Answers