Which of the following is NOT a component of TDH?

• A. Static head
• B. Friction losses
• C. Minor losses
• D. Pump efficiency

Answer: (D)

Total Dynamic Head represents the hydraulic resistance the pump must overcome in the system. It sums up the vertical lift needed (static head) and the energy losses due to flow through pipes and fittings (friction losses and minor losses). Those three parts together describe how much head the pump must supply to push water through the piping network.

Pump efficiency, on the other hand, is about how well the pump converts mechanical energy (drive power) into hydraulic energy. It affects how much power you need to drive the pump, not the actual head that the system requires. So while the first three elements are the head losses the pump has to overcome, efficiency is not a component of TDH.