A fixture branch uses 18 feet of pipe at 1/4 inch fall per foot. What total fall is required?
Correct Answer
D) 4.5 inches.
At 1/4 inch per foot, 18 feet needs 4.5 inches of fall.
Why This Is the Correct Answer
At 1/4 inch per foot, 18 feet needs 4.5 inches of fall.
Why the Other Options Are Wrong
Option A: 3.0 inches total.
3.0 inches total. is below the supported result for plumbing drainage slope calculation; it likely omits allowance, conversion, coverage, or final round-up.
Option B: 3.5 inches total.
3.5 inches total. is below the supported result for plumbing drainage slope calculation; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 4.0 inches total.
4.0 inches total. is below the supported result for plumbing drainage slope calculation; it likely omits allowance, conversion, coverage, or final round-up.
Memory Technique
Measure to inch, adjust for foot, then let Checking Laundry set the finish line.
Reference Hint
Study anchor (closed-book): memorize Plumbing drainage slope calculation from California Plumbing Code, California Code of Regulations Title 24. / Title 24 California Plumbing Code fixture branch slope; know the rule or calculation trigger without relying on exam-room lookup.
More Class B Trade Questions
A 2-inch horizontal sanitary branch must be installed at 1/4 inch fall per foot. What total fall is needed over a 24-foot run?
A 4-inch building drain is laid out with a required 1/8 inch fall per foot. What fall is required across 40 feet?
A rooftop unit schedule shows 3 tons of cooling. Using 12,000 Btu per hour per ton, what cooling capacity is this?
A pump motor is listed as 2 horsepower, and the coordination table asks for watts. Using 746 watts per horsepower, what is the approximate motor power?
A slab is 30 feet long, 18 feet wide, and 4 inches thick. How many cubic yards of concrete are needed before waste?
A footing is 80 feet long, 2 feet wide, and 12 inches deep. How many cubic yards of concrete are required before waste?
A patio subgrade must drain at 2 percent away from the building for 20 feet. What total drop is required?
A building pad needs 150 compacted cubic yards of fill. If the borrow material shrinks 10 percent after compaction, about how many loose cubic yards should be hauled in?
A roofing estimate shows 2,850 square feet of roof area. How many roofing squares is that?
A waterproof deck surface is 14 feet deep and must slope 1/4 inch per foot to the drain. What vertical fall is needed?
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