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

Fluid density

Answer

Flow temperature

Answer

Pipe length

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 weight of the object

Answer

The pressure at the object's centroid times its volume

Answer

The surface tension force times the perimeter

Question 3

A Venturi meter measures flow rate by exploiting which principle?

Accepted Answer

Pressure decreases as velocity increases

Answer

Pressure increases as velocity increases

Answer

Velocity is constant across a constriction

Answer

Fluid density changes with velocity

Question 4

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

Accepted Answer

Subcritical (tranquil) flow

Answer

Supercritical flow

Answer

Laminar flow

Answer

Turbulent flow

Question 5

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

Accepted Answer

4 × Cross-sectional area / Wetted perimeter

Answer

Cross-sectional area / Wetted perimeter

Answer

Perimeter / Cross-sectional area

Answer

Square root of the cross-sectional area

Question 6

The Navier-Stokes equations describe:

Accepted Answer

Motion of viscous fluid substances

Answer

Heat transfer in solids

Answer

Electrical current in conductors

Answer

Deformation of elastic solids under load