Hydraulics & Fluid Mechanics Flashcards
6 cards from real BCE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Hydraulics & Fluid Mechanics flashcards as text
What does Bernoulli's equation primarily conserve in fluid flow?
Answer: Energy
Bernoulli's equation is a statement of the conservation of energy along a streamline in steady, incompressible, frictionless flow.
Which dimensionless number represents the ratio of inertial forces to viscous forces in fluid flow?
Answer: Reynolds number
The Reynolds number (Re = ρVD/μ) represents the ratio of inertial to viscous forces and determines whether flow is laminar or turbulent.
What is the hydraulic radius of a circular pipe flowing full with diameter D?
Answer: D/4
For a full circular pipe, hydraulic radius R = Area/Wetted Perimeter = (πD²/4)/(πD) = D/4.
Manning's equation is primarily used to calculate flow in which type of system?
Answer: Open channel flow
Manning's equation (V = (1/n)R^(2/3)S^(1/2)) is used to compute velocity and discharge in open channel flow.
Which type of flow occurs when the Froude number is less than 1 in an open channel?
Answer: Subcritical flow
When Fr < 1, the flow is subcritical (tranquil), meaning gravitational forces dominate over inertial forces.
The specific energy in an open channel is defined as the energy head measured above which datum?
Answer: The channel bottom
Specific energy E = y + V²/2g is the total energy per unit weight measured with respect to the channel bottom as datum.