The total head against which a pump has to work include(s) i. Static Head ii. Velocity Head iii. Head Loss
- AOnly (i) and (ii)
- BOnly (ii) and (iii)
- COnly (i) and (iii)
- D(i), (ii) and (iii)Correct
Solution
Concept
Total dynamic head required for pumps
Formula
NONE
Step-by-step solution
1. A pump must overcome static suction and discharge lifts as well as system head losses. 2. Total head includes static head, velocity head at discharge, and friction head losses in the pipe network. 3. Therefore, static head, velocity head, and head loss are all included. Answer: D
Explanation
The total dynamic head against which a pump must operate includes the vertical elevation change, the kinetic energy required to move fluid, and frictional head losses in the piping system. Because static head, velocity head, and head loss all contribute to the total head, option D is the correct choice.
Why the other options are wrong
A) Head loss is omitted from the total head calculation. B) Static head is omitted from the total head calculation. C) Velocity head is omitted from the total head calculation.
Shortcut
Total dynamic head includes all three components: Static Head, Velocity Head, and Head Loss.
Common mistake
Selecting option C by considering only static head and head loss while neglecting velocity head in total dynamic head.
Correct answer: D) (i), (ii) and (iii)