STSC Tool and Equipment Safety 3

Question 1

What is the primary hazard created by using a pneumatic nail gun with the contact-trip safety feature defeated or bypassed?

Accepted Answer

Unintentional nail discharge and double-fire events that cause penetrating injuries

Answer

Bypassing the contact-trip safety on nail guns is the leading cause of nail gun injuries because it allows unintentional discharge and double fires when the trigger is held.

Question 2

When should abrasive grinding wheels be inspected for cracks before use?

Accepted Answer

Before each use, using a ring test and visual inspection

Answer

Grinding wheels must be inspected before each use using a ring test (tapping test) and visual check, since a cracked wheel can shatter catastrophically at operating speed.

Question 3

Which class of portable fire extinguisher is appropriate for a fire involving energized electrical power tools?

Accepted Answer

Class C

Answer

Class C extinguishers are rated for energized electrical fires because they use non-conductive agents that will not conduct electricity back to the operator.

Question 4

A construction worker uses a jackhammer for four continuous hours. What is the primary occupational health hazard from this exposure?

Accepted Answer

Hand-arm vibration syndrome (HAVS) affecting nerves and circulation

Answer

Prolonged use of vibrating tools like jackhammers can cause hand-arm vibration syndrome (HAVS), a permanent, progressive condition affecting nerves, blood vessels, and joints.

Question 5

What is the safe method for transferring a tool to another worker on a scaffold or elevated work platform?

Accepted Answer

Use a tool bag, bucket, or hand line to lower or pass tools safely

Answer

Tools must be transferred using a tool bag, bucket, or rope to eliminate the dropped-object hazard to workers and others below the elevated work area.

(STSC) Safety Trained Supervisor Construction Practice Test

(STSC) Safety Trained Supervisor Construction Practice Test

STSC Tool and Equipment Safety 3