EIT Fluid Mechanics

Question 1

What does Bernoulli's equation express?

Accepted Answer

Conservation of energy along a streamline

Answer

Conservation of mass

Answer

Conservation of momentum

Answer

Newton's second law for fluids

Question 2

The Reynolds number Re = ρvD/μ classifies flow as turbulent when Re exceeds approximately:

Accepted Answer

2300

Answer

500

Answer

10000

Answer

100000

Question 3

What is the SI unit of dynamic viscosity?

Accepted Answer

Pa·s

Answer

m²/s

Answer

N/m

Answer

kg/m³

Question 4

For a fluid at rest, pressure varies with depth according to:

Accepted Answer

P = ρgh

Answer

P = ½ρv²

Answer

P = μ(dv/dy)

Answer

P = E/V

Question 5

The continuity equation for incompressible flow states:

Accepted Answer

A₁v₁ = A₂v₂

Answer

ρ₁A₁v₁ = ρ₂A₂v₂

Answer

P₁ + ½ρv₁² = P₂ + ½ρv₂²

Answer

τ = μ(dv/dy)

Question 6

What is the buoyant force on an object submerged in a fluid?

Accepted Answer

Equal to the weight of fluid displaced

Answer

Equal to the weight of the object

Answer

Equal to the surface area times pressure

Answer

Equal to the density of the object times gravity