Question

Hydraulic gradient line takes into consideration

(a) potential and kinetic heads only

(b) potential and pressure heads only

(c) kinetic and pressure heads only

(d) potential, kinetic and pressure heads

This question was posed to me by my school principal while I was bunking the class.

The query is from Hydraulic Gradient and Total Energy Line topic in section Flow Through Pipes of Fluid Mechanics

Answer 1

Correct choice is (b) potential and pressure heads only

Easy explanation: HGL is obtained by plotting piezometric head at various points along the axis of the pipe.

Hp = P ⁄ γ + z

where Hp is the piezometric head, P ⁄ γ  is the pressure head and z is the potential head.