Question

Which of the following pairs are correctly matched?

1. Piezometric head
....Sum of datum head and pressure head

2. Dynamic head
...Sum of datum head and velocity head

3. Stagnation head
...Sum of pressure head and velocity head

4. Total head
...Sum of piezometric head and dynamic head

Select the correct answer using the codes given below:

• A. 1, 2 and 3
• B. 1, 3 and 4
• C. 1, 2 and 4
• D. 2, 3 and 4

Answer 1

The correct option is B 1, 3 and 4

As per Bernoulli's equation total head,

$H=\frac{p}{\rho g}+Z+\frac{V^2}{2g}$

where

$\frac{p}{\rho g}\text{is pressure head or static head}$

Z is datum or elevation head

$\frac{V^2}{2g}\text{is velocity head or dynamic head or kinetic head}$

$\frac{p}{\rho g}\text{is also called piezometric head}$

$\frac{p}{\rho g}+\frac{V^2}{2g}\text{is also stagnation head}$

(Kinetic energy is converted into pressure energy).