Which one of the following phenomena in a pipe flow is termed as water hammer?
- AThe sudden rise of pressure in a long pipe due to sudden closure of valve.Correct
- BThe rise of pressure in a pipe due to gradual closure of valve.
- CThe rise of negative pressure.
- DThe zero pressure in a pipe flow.
Solution
Concept
Water hammer
Step-by-step solution
1. Sudden valve closure causes pressure rise.
Explanation
Momentum of water is converted to pressure.
Why the other options are wrong
Gradual closure gives a small rise.
Shortcut
Sudden closure.
Correct answer: A) The sudden rise of pressure in a long pipe due to sudden closure of valve.