Fluid Mechanics Flashcards
6 cards from real EIT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Fluid Mechanics flashcards as text
The Darcy-Weisbach equation is used to calculate:
Answer: Head loss due to friction in a pipe
The Darcy-Weisbach equation hf = f(L/D)(v²/2g) gives the head loss due to pipe friction.
What is the Mach number of a flow with velocity 340 m/s in air where the speed of sound is 340 m/s?
Answer: 1.0
Mach number M = v/c = 340/340 = 1.0, representing exactly sonic flow.
Which type of flow has fluid layers moving parallel to each other without mixing?
Answer: Laminar flow
Laminar flow consists of parallel layers (laminae) with no lateral mixing, occurring at low Reynolds numbers.
A Pitot tube measures:
Answer: Stagnation (total) pressure
A Pitot tube converts kinetic energy to pressure energy, measuring stagnation (total) pressure at a point.
What is the hydraulic diameter of a square duct with side length a?
Answer: a
The hydraulic diameter D_h = 4A/P = 4a²/4a = a for a square cross-section.
In fluid statics, the center of pressure on a submerged vertical surface is located:
Answer: Below the centroid
The center of pressure is always below the centroid because pressure increases with depth, shifting the resultant force downward.