A contractor had 3 OSHA-recordable cases and 150,000 labor-hours. What is the total recordable incident rate using the 200,000-hour base?
Correct Answer
C) 4.0
TRIR is 3 x 200,000 / 150,000 = 4.0.
Why This Is the Correct Answer
TRIR is 3 x 200,000 / 150,000 = 4.0.
Why the Other Options Are Wrong
Option A: 2.0
trir calculation, choice a: 2.0 backs into 0.5 when divided by 4.0; the accepted setup gives 1 on that same base.
Option B: 3.0
trir calculation, choice c: 3 gives 3.0. That calculation copies a listed value without completing the operation.
Option D: 6.0
trir calculation, choice d: 6.0 backs into 1.5 when divided by 4.0; the accepted setup gives 1 on that same base.
Memory Technique
Store TRIR calculation with its last math move; nearby answers are usually unfinished versions of 4.0.
Reference Hint
Open 29 CFR Part 1926 (OSHA Construction Standards), 1926-2023 / PSI OSHA Excerpts 2025; use OSHA reporting / recordkeeping topic to confirm that TRIR is 3 x 200,000 / 150,000 = 4.0.
More NASCLA Questions
Bid instructions require bid security with each sealed bid. Which purpose should the estimator associate with that requirement?
A wood deck surface has 320 sf of coverage. Boards have a 5-1/2 in. actual face width, and the order includes an 8 percent cutting allowance. What linear footage is closest?
Using the dimensions shown for the stabilized construction entrance, what is the plan area?
A reroof area requires 14,720 sf of rigid insulation. Boards are 4 ft by 8 ft, and the order includes 5 percent waste. How many boards are needed?
Two addenda revise the drawings before bid day. What must a responsive bidder normally do with those addenda?
A utility trench is 180 ft long, 3 ft wide, and 7 ft deep with vertical sides inside a trench shield. What excavation volume is required?
A 120 ft long Type C trench is cut with a 4 ft bottom width and a 6 ft depth. If side slopes are 1-1/2 horizontal to 1 vertical, what excavation volume is closest?
A storm pipe run needs 240 ft of bedding, 4 ft wide and 6 in. thick. Including a 10 percent ordering allowance, how many cubic yards of bedding aggregate are needed?
A mass excavation produces 1,180 loose cubic yards of material for off-site disposal. End-dump trucks can haul 18 loose cubic yards per trip. What truck count is required?
An asphalt-shingle roof has a slope of 3:12. Under the IBC low-slope asphalt-shingle provisions, what underlayment arrangement is required?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass
Project Management
60 questions · 70% to pass