For geometrically similar centrifugal pumps with the same impeller diameter, pump power varies with rotational speed approximately as:
Correct answer: C. The cube of speed
- A. The first power of speed
- B. The square of speed
- C. The cube of speed
- D. The inverse of speed
Explanation
The pump affinity laws give power proportional to the cube of rotational speed when the impeller diameter is unchanged. Discharge varies approximately with speed, while head varies with the square of speed.
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
The head loss at the entrance of a pipe is commonly expressed as which relation?
For an ideal orifice discharging under a head H, which expression gives the theoretical discharge through area A?
For a spillway crest controlled by a free nappe, increasing the upstream head generally causes the discharge to:
In the hydrologic cycle, evapotranspiration represents the combined loss of water by:
The phi-index of a storm is defined as the constant infiltration rate that makes the rainfall excess equal to the:
In irrigation engineering, the term delta denotes the: