ME or MEng Master of Engineering Fluid Mechanics and Hydraulics 2

Question 1

The Moody diagram relates friction factor to Reynolds number and:

Accepted Answer

Relative roughness (ε/D)

Answer

The Moody diagram plots Darcy friction factor against Reynolds number and relative roughness ε/D for pipe flow.

Question 2

Archimedes' principle states that the buoyant force on a submerged object equals:

Accepted Answer

The weight of fluid displaced by the object

Answer

The buoyant force equals the weight of the fluid displaced, acting upward through the center of buoyancy.

Question 3

A Venturi meter measures flow rate by exploiting which principle?

Accepted Answer

Pressure decreases as velocity increases

Answer

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.

Question 4

In open-channel flow, the Froude number less than 1 indicates:

Accepted Answer

Subcritical (tranquil) flow

Answer

Fr = V/√(gy) < 1 indicates subcritical or tranquil flow, where gravity waves can propagate upstream.

Question 5

Hydraulic diameter D_h for a non-circular duct is defined as:

Accepted Answer

4 × Cross-sectional area / Wetted perimeter

Answer

D_h = 4A/P allows pipe-flow correlations to be applied to non-circular ducts by using an equivalent hydraulic diameter.

ME or MEng Master of Engineering Practice Test

ME or MEng Master of Engineering Practice Test

ME or MEng Master of Engineering Fluid Mechanics and Hydraulics 2