ME or MEng Master of Engineering Fluid Mechanics and Hydraulics

Question 1

Bernoulli's equation is derived from which conservation principle?

Accepted Answer

Conservation of energy

Answer

Bernoulli's equation is derived from the energy equation for steady, inviscid, incompressible flow along a streamline.

Question 2

The Reynolds number for flow in a pipe transitions from laminar to turbulent at approximately:

Accepted Answer

Re = 2300

Answer

For pipe flow, laminar conditions persist below Re ≈ 2300, with transition to turbulence occurring between 2300 and 4000.

Question 3

The Darcy-Weisbach equation is used to calculate:

Accepted Answer

Head loss due to friction in pipe flow

Answer

The Darcy-Weisbach equation h_f = f(L/D)(V²/2g) calculates major (friction) head losses in pipe flow.

Question 4

Pascal's Law states that pressure applied to an enclosed fluid:

Accepted Answer

Is transmitted equally in all directions

Answer

Pascal's Law states that a pressure change at any point in a confined, incompressible fluid is transmitted equally throughout.

Question 5

The continuity equation for steady incompressible flow requires that:

Accepted Answer

The product of cross-sectional area and velocity is constant

Answer

For incompressible steady flow, A₁V₁ = A₂V₂, meaning the volumetric flow rate is conserved along the flow path.

ME or MEng Master of Engineering Practice Test