A rooftop unit schedule lists capacity in tons of cooling. In HVAC estimating, one ton of cooling equals what heat-transfer rate?
Correct Answer
A) 12,000 Btu/h
One ton of cooling is 12,000 Btu/h. Other choices confuse refrigeration tons with watts-to-Btu conversion, a rounded small load, or an electrical conversion constant.
Why This Is the Correct Answer
One ton of cooling is 12,000 Btu/h. Other choices confuse refrigeration tons with watts-to-Btu conversion, a rounded small load, or an electrical conversion constant.
Why the Other Options Are Wrong
Option B: 10,000 Btu/h
Choice B (10,000 Btu/h) is rejected because 10,000 Btu/h is a different published number than the cited Cooling capacity units value; HVAC cooling-capacity units supports 12,000 Btu/h. The cited answer is 12,000 Btu/h.
Option C: 1,000 Btu/h
In mechanical and plumbing, 1,000 Btu/h is the wrong selection for Cooling capacity units: 1,000 Btu/h is a different published number than the cited Cooling capacity units value; HVAC cooling-capacity units supports 12,000 Btu/h.
Option D: 3,412 Btu/h
The trap in D is 3,412 Btu/h. That selection is wrong because 3,412 Btu/h is a different published number than the cited Cooling capacity units value; HVAC cooling-capacity units supports 12,000 Btu/h; One ton of cooling equals 12,000 Btu/h.
Memory Technique
Treat cooling capacity units like a labeled shelf; only the matching condition belongs with 12,000 Btu/h.
Reference Hint
Open Mechanical and Electrical Systems for Construction Managers, 4th Ed., 2024; use the index entry or section for "HVAC cooling-capacity units" to confirm that One ton of cooling is 12,000 Btu/h.
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