In the complete turbulence zone (in rough pipes), the____________________?
Correct answer: D. Friction factor is independent of the relative roughness
- A. Rough and smooth pipes have the same friction factor
- B. Laminar film covers the roughness projections
- C. Friction factor depends upon NRe only
- D. Friction factor is independent of the relative roughness
Explanation
In the complete turbulence zone, viscous effects are negligible and the friction factor no longer changes appreciably with Reynolds number. It is governed mainly by the relative roughness, so rough and smooth pipes do not have the same friction factor.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Fluid Flow Operations
909 free Fluid Flow Operations MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Fluid Flow Operations questions
What is the value of Fanning friction factor f ' for smooth pipe at NRe = 106 approximately ?
For turbulent flow of an incompressible fluid through a pipe, the flow rate „Q‟ is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent 'n' is_________________?
The boundary layer is that part of a moving fluid, in which the fluid velocity is_________________?
Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around________________?
Equivalent length of a pipe fitting is____________________?
In deriving Bernoulli's equation, fluid is assumed to be________________?