STSC Tool and Equipment Safety 4 — Questions and Answers
Question 1: When using a powder-actuated tool, what is the minimum thickness of the base material the tool should be fired into?
- 1/4 inch
- 1/2 inch (Correct answer)
- 3/4 inch
- 1 inch
Correct answer: 1/2 inch
OSHA requires that powder-actuated tools not be fired into material less than 1/2 inch thick unless the material is backed by a substance that will prevent the fastener from passing through.
Question 2: Which class of ladder is rated for extra-heavy-duty industrial use with a maximum load capacity of 375 lbs?
- Type I
- Type IA
- Type II
- Type IAA (Correct answer)
Correct answer: Type IAA
Type IAA ladders are rated for special duty with a 375 lb load capacity, making them the highest-rated class for industrial use.
Question 3: A grinder wheel is marked with a maximum RPM of 4,000. What is the correct action if the grinder motor speed is 3,600 RPM?
- It is acceptable to use as the wheel rating exceeds the tool speed (Correct answer)
- Replace the wheel with one rated for exactly 3,600 RPM
- The tool must not be used because the speeds are too close
- Reduce the grinder speed to 3,000 RPM before use
Correct answer: It is acceptable to use as the wheel rating exceeds the tool speed
The wheel's rated RPM must equal or exceed the tool's maximum speed; a 4,000 RPM wheel is safe on a 3,600 RPM grinder.
Question 4: What is the primary hazard of using a cheater bar (pipe extension) on a wrench handle?
- Increased electrical conductivity
- Overloading the wrench beyond its rated torque causing breakage (Correct answer)
- Reduced grip on the fastener
- Static electricity buildup
Correct answer: Overloading the wrench beyond its rated torque causing breakage
Cheater bars multiply torque far beyond the tool's rated capacity, which can cause sudden tool failure and serious injury.
Question 5: According to OSHA, wooden handles on tools must be inspected and replaced when they are:
- More than one year old
- Cracked, splintered, or loose (Correct answer)
- Not painted with a safety color
- Heavier than the manufacturer's specification
Correct answer: Cracked, splintered, or loose
OSHA 29 CFR 1926.301 requires that tool handles be free of cracks, splinters, and looseness to prevent loss of control during use.
Question 6: Which safeguard is specifically required when using a table saw on a construction site?
- Anti-kickback device and blade guard (Correct answer)
- Double insulation
- GFCI-only outlet
- Grounding strap on the operator
Correct answer: Anti-kickback device and blade guard
OSHA requires table saws to be equipped with blade guards and anti-kickback devices to prevent material from being thrown back at the operator.
Question 7: When storing pneumatic nailers at the end of a shift, what is the required first step?
- Disconnect the air supply hose (Correct answer)
- Remove all fasteners from the magazine
- Engage the safety trigger mechanism
- Apply lubricating oil to the barrel
Correct answer: Disconnect the air supply hose
Disconnecting the air supply is the first step to de-energize a pneumatic tool before any maintenance, storage, or magazine clearing.
STSC Tool and Equipment Safety 4
When using a powder-actuated tool, what is the minimum thickness of the base material the tool should be fired into?