The ratio of width to depth for the most economical rectangular section in open channel flow is_________________?

A. static
B. Dynamic
C. Total
D. None of these

A. Fluid flow rate & friction loss
B. Length & friction factor
C. Diameter & friction factor
D. Length & diameter

A. Frictionless & incompressible
B. One, which obeys Newton’s law of viscosity
C. Highly viscous
D. None of these

A. 4f (L/D) (v2/2gc) ρ
B. 32 (μLV/gc D2)
C. 16/NRe
D. (fLρ/D) (v2/2gc)

A. < 0.3
B. > 3
C. 50
D. 1

A. < 1
B. > 1
C. < 5
D. None of these