A detail drawing shows a scale of 3/4" = 1'-0". If a dimension measures 2.25 inches on the drawing, what is the actual dimension?
Correct Answer
A) 3 feet 0 inches
At 3/4" = 1'-0" scale, 2.25 inches on the drawing equals 2.25 ÷ 0.75 = 3 feet actual dimension.
Why This Is the Correct Answer
To convert from drawing dimension to actual dimension with a scale of 3/4" = 1'-0", you divide the drawing measurement by the scale factor. The scale factor is 3/4 = 0.75 inches per foot. Dividing 2.25 inches by 0.75 gives us 3, which represents 3 feet. This is the correct mathematical relationship for architectural scale conversions.
Why the Other Options Are Wrong
Option B: 3 feet 6 inches
This answer suggests 3.5 feet, which would result from using an incorrect scale factor or mathematical error in the conversion process.
Option D: 2 feet 6 inches
This answer of 4 feet would result from incorrectly assuming a 1:1 scale or using a wrong conversion factor in the calculation.
Memory Technique
Remember 'D-D-A': Drawing Divided by Decimal scale = Actual size. Also remember 3/4 scale is common and equals 0.75 - practice this conversion until automatic.
Reference Hint
Look up architectural drawing scales and scale conversions in the construction documents section of your reference materials, typically found in drafting or blueprint reading chapters.
More Project Mgmt Questions
What is the minimum R-value required for wall insulation in Florida Climate Zone 2?
A subcontractor brings a new chemical product to your jobsite. Under the Globally Harmonized System (GHS), what information must be immediately available to workers?
A construction site has a trench that is 8 feet deep in Type B soil. What is the maximum allowable slope ratio for the trench walls without protective systems?
What is the maximum recommended spacing between drywall screws when attaching to wood studs?
Your crew discovers suspected asbestos-containing materials during a renovation project. What is the first action you should take?
A scaffold platform is 12 feet long and 5 feet wide. If the maximum load capacity is 25 pounds per square foot, what is the total weight capacity of this platform?
Which CSI MasterFormat Division would contain specifications for fire-stopping and firesafing materials?
In tilt-up concrete construction, what is the primary advantage of this method over conventional cast-in-place construction?
Which OSHA standard specifically addresses construction industry safety and health regulations?
A structural drawing shows a beam labeled 'W12x26'. What does the '26' represent?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass
Related Study Resources
Previous Question
A concrete footing requires 45 cubic yards of concrete. The concrete truck delivers in increments of 10 cubic yards. How many truck loads will be needed?
Next Question
A project has a building footprint of 4,800 square feet with a site area of 1.2 acres. If the local zoning requires a maximum building coverage of 35%, does this project comply?