Fundamentals of Engineering Fluid Mechanics and Thermodynamics

Question 1

Bernoulli's equation is derived from conservation of which quantity along a streamline?

Accepted Answer

Energy

Answer

Bernoulli's equation is an energy conservation equation along a streamline for steady, incompressible, inviscid flow.

Question 2

What is the hydrostatic pressure at a depth h in a fluid of density ρ?

Accepted Answer

ρgh

Answer

Hydrostatic pressure is p = ρgh, where ρ is fluid density, g is gravitational acceleration, and h is depth.

Question 3

The continuity equation for incompressible flow through a pipe states that:

Accepted Answer

A₁V₁ = A₂V₂

Answer

For incompressible flow, conservation of mass requires A₁V₁ = A₂V₂ (flow rate is constant).

Question 4

Which law of thermodynamics states that energy cannot be created or destroyed, only converted?

Accepted Answer

First law of thermodynamics

Answer

The First Law of Thermodynamics is the law of conservation of energy: ΔU = Q - W.

Question 5

What does the Reynolds number represent in fluid mechanics?

Accepted Answer

The ratio of inertial forces to viscous forces

Answer

The Reynolds number Re = ρVD/μ is the ratio of inertial to viscous forces, used to predict flow regime (laminar vs. turbulent).

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