Which of the following statements concerning fluid flow is true?

Correct Answer: Option A — If a fluid flowing through a tube reaches a constriction or narrowing of the tube, the velocity of the fluid flowing through the restriction increases and the pressure decreases.

Bernoulli’s principle dictates that for an incompressible fluid, an increase in velocity through a constriction must be accompanied by a corresponding decrease in static pressure. This principle is fundamental to gas turbine inlet design and nozzle operation, where kinetic energy is exchanged for pressure energy or vice versa.