Adding dynamic suction lift and dynamic discharge head provides dynamic total head. Which option best represents this relationship?

• A. Flow rate
• B. Dynamic suction lift and dynamic discharge head
• C. Suction head and discharge head
• D. Total head and flow

Answer: (B)

The relationship being tested is that dynamic total head is formed by adding the energy needed on the suction side to the energy needed on the discharge side. In practical terms, dynamic suction lift is the head required to raise water from the source to the pump, and dynamic discharge head is the head required to push it to the discharge point. When these two components are added together, they produce the dynamic total head. The option that lists both dynamic suction lift and dynamic discharge head directly represents these two contributing parts, so it’s the best fit for describing how dynamic total head is determined. The other options don’t capture this decomposition: flow rate isn’t a head component, and pairing total head with flow or mixing different head terms doesn’t show the additive relationship between suction and discharge heads.