Fluid Mechanics and Hydraulics Flashcards
6 cards from real ME or MEng Master of Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Fluid Mechanics and Hydraulics flashcards as text
The Moody diagram relates friction factor to Reynolds number and:
Answer: Relative roughness (ε/D)
The Moody diagram plots Darcy friction factor against Reynolds number and relative roughness ε/D for pipe flow.
Archimedes' principle states that the buoyant force on a submerged object equals:
Answer: The weight of fluid displaced by the object
The buoyant force equals the weight of the fluid displaced, acting upward through the center of buoyancy.
A Venturi meter measures flow rate by exploiting which principle?
Answer: Pressure decreases as velocity increases
A Venturi meter measures the pressure drop across a converging section; lower pressure at the throat (where velocity is higher) via Bernoulli's equation allows flow rate calculation.
In open-channel flow, the Froude number less than 1 indicates:
Answer: Subcritical (tranquil) flow
Fr = V/√(gy) < 1 indicates subcritical or tranquil flow, where gravity waves can propagate upstream.
Hydraulic diameter D_h for a non-circular duct is defined as:
Answer: 4 × Cross-sectional area / Wetted perimeter
D_h = 4A/P allows pipe-flow correlations to be applied to non-circular ducts by using an equivalent hydraulic diameter.
The Navier-Stokes equations describe:
Answer: Motion of viscous fluid substances
The Navier-Stokes equations are nonlinear partial differential equations describing the motion of viscous, Newtonian fluids.