Mechanical drawing primarily depicts:

• A. HVAC Systems
• B. Plumbing Fixtures Only
• C. Electrical Wiring Diagrams
• D. Structural Details

Answer: (A)

Mechanical drawings focus on heating, ventilation, and air conditioning systems. They show where HVAC equipment is placed (boilers, chillers, air handlers, and other machinery), how ductwork and piping carry air and conditioned fluid, and how controls and sensors are wired into the system. Plumbing fixtures and their piping belong to plumbing drawings, not mechanical; electrical diagrams cover wiring and circuits for electrical systems; structural drawings illustrate the building’s framework and supports. Because the purpose of mechanical drawings is to communicate the layout and installation of climate-control and air-distribution systems, HVAC is the best fit for what these drawings primarily depict.