OSHA Powered Industrial Truck (29 CFR 1910.178) Exam Questions & Answers 2026 (11–20)

Question 1

Why must only trucks approved for the location be used in areas with flammable vapours or combustible dust?

TheoryPractice · Accepted Answer

An unapproved truck could ignite the atmosphere and cause an explosion. Hazardous-location truck designations (e.g. EX, DS) limit ignition sources. Using a non-rated truck where flammable atmospheres exist risks fire or explosion.

Question 2

A forklift that is found to be in unsafe operating condition must be:

TheoryPractice · Accepted Answer

Removed from service until repaired. Any truck not in safe operating condition must be taken out of service until it has been restored to safe operating condition.

Question 3

What color is typically used for mandatory action signs in industrial safety?

TheoryPractice · Accepted Answer

Blue. ISO/ANSI safety signage uses blue circles for mandatory action signs, distinguishing them from red (prohibition), yellow (warning), and green (safe condition) signs.

Question 4

How should emergency doors or exits be maintained?

TheoryPractice · Accepted Answer

Closed but not locked. Emergency doors and exits must remain unlocked at all times so people can exit freely, but should be kept closed (not propped wide open) to maintain security and fire compartmentalization.

Question 5

What is the way to put items side by side in exactly the same direction and change their stacking at 90 degrees?

TheoryPractice · Accepted Answer

Alternate juxtaposing stacking. Alternate juxtaposing stacking places items side by side facing the same direction, then rotates the next layer 90 degrees to interlock the stack for stability.

Question 6

What type of stacker features the front wheel as the driving wheel equipped with a differential gear device?

TheoryPractice · Accepted Answer

Counterbalance lift truck. A counterbalance lift truck typically uses its front wheels, fitted with a differential gear, as the driving wheels.

Question 7

Which of the following names is commonly used interchangeably with stacker?

TheoryPractice · Accepted Answer

Forklift. "Forklift" is the common name most often used interchangeably with "stacker" or "lift truck."

Question 8

Which personal protective equipment should be worn while operating a stacker?

TheoryPractice · Accepted Answer

Steel-toed boots for foot protection. Steel-toed boots protect an operator's feet from crush injuries caused by dropped loads or running over objects, making them essential PPE for stacker operation.

Question 9

What is the term for the distance from the center of the front axle to the center of the rear axle of the stacker?

TheoryPractice · Accepted Answer

Wheelbase. Wheelbase is the distance measured from the center of the front axle to the center of the rear axle of a vehicle.

Question 10

According to typical safety guidelines, what does the sticker on a stacker say about standing near the shuttle?

TheoryPractice · Accepted Answer

No one is allowed to stand. Safety stickers near the shuttle/mast area typically warn that no one is allowed to stand in that zone due to the risk of a falling load or moving parts.

OSHA Powered Industrial Truck (29 CFR 1910.178) Exam Questions & Answers 2026 (11–20)

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