When water passes through a sudden enlargement in a pipe, the resulting head loss is mainly caused by:
Correct answer: C. Boundary-layer separation and eddies
- A. An increase in fluid viscosity to zero
- B. A reduction in atmospheric pressure
- C. Boundary-layer separation and eddies
- D. Conversion of all pressure head into velocity head
Explanation
A sudden enlargement causes flow separation and eddy formation, which dissipate mechanical energy as turbulence. Although velocity decreases and some pressure is recovered, the process still produces an irreversible head loss.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Hydraulics and Water Resources
Hydraulics studies fluid properties, pressure, buoyancy, continuity, Bernoulli's equation, momentum, pipe flow, open-channel flow and hydraulic machines. Water resources extends these principles to pumps, turbines, reservoirs, irrigation, floods and hydrology, while distinguishing laminar from turbulent flow and uniform from gradually varied channel flow.
Practise Hydraulics and Water Resources
78 free Hydraulics and Water Resources MCQs from Civil Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Civil Engineering questions like this
Civil Engineering is on 3 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Hydraulics and Water Resources questions
Flow in a circular pipe is generally considered laminar when the Reynolds number is:
In a hydraulic press, Pascal's law states that pressure applied to a confined fluid is transmitted:
The main purpose of a spillway at a storage dam is to:
Which expression is used in the Manning equation for the discharge of a prismatic open channel?
Which hydraulic turbine is most suitable for a site with very high head and relatively low discharge?
In irrigation engineering, duty of water is defined as the: