EIT Fluid Mechanics 2

Question 1

The Darcy-Weisbach equation is used to calculate:

Accepted Answer

Head loss due to friction in a pipe

Answer

The Darcy-Weisbach equation hf = f(L/D)(v²/2g) gives the head loss due to pipe friction.

Question 2

What is the Mach number of a flow with velocity 340 m/s in air where the speed of sound is 340 m/s?

Accepted Answer

1.0

Answer

Mach number M = v/c = 340/340 = 1.0, representing exactly sonic flow.

Question 3

Which type of flow has fluid layers moving parallel to each other without mixing?

Accepted Answer

Laminar flow

Answer

Laminar flow consists of parallel layers (laminae) with no lateral mixing, occurring at low Reynolds numbers.

Question 4

A Pitot tube measures:

Accepted Answer

Stagnation (total) pressure

Answer

A Pitot tube converts kinetic energy to pressure energy, measuring stagnation (total) pressure at a point.

Question 5

What is the hydraulic diameter of a square duct with side length a?

Accepted Answer

a

Answer

The hydraulic diameter D_h = 4A/P = 4a²/4a = a for a square cross-section.

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