Civil Engineering MCQAE Level Civil Engineering
For maximum discharge in a circular pipe flowing partly full (not full), the depth of flow that gives maximum discharge is approximately:
Fluid MechanicsHydraulic Radius Max FlowMEDIUM
Choose the correct answer
A
0.5D (half full)
B
0.81D
C
0.94D
D
Full (D)
Correct Answer
C. 0.94D
Why is this the answer?
For a circular pipe, maximum discharge occurs at depth = 0.94D (94% full), not when completely full. This is because at 0.94D, the product A x R^(2/3) is maximum. At full flow, the increased wetted perimeter reduces velocity enough to lower Q.
Related Fluid Mechanics MCQs
More solved Fluid Mechanics questions for AE/JE Civil Engineering exams.
- The 'draft tube' in a reaction turbine (Francis/Kaplan) serves to:
- The 'tsunami' is distinguished from wind waves by:
- The 'specific energy' in open channel flow is:
- Two identical pumps in 'series' vs. 'parallel' connection:
- The 'flow net' for seepage analysis consists of:
- The 'cavitation' damage to hydraulic turbines and pump impellers appears as:
Practice more Civil Engineering questions
This MCQ belongs to AE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.