'Francis'' formula' for a rectangular notch including end contractions is:
Choose the correct answer
Q = 1.84LH^(5/2) (wrong exponent)
Q = 1.84(L - 0.1nH)H^(3/2) where n = number of end contractions (0 or 2)
Q = 1.84LH^(1/2) only
Q = Cd×L×H without specific coefficient
Correct Answer
B. Q = 1.84(L - 0.1nH)H^(3/2) where n = number of end contractions (0 or 2)
Why is this the answer?
Francis formula (with n end contractions): Q = 1.84(L - 0.1nH)H^(3/2) where n = number of end contractions (0 for suppressed, 2 for both ends contracted). The term 0.1nH accounts for contracted effective length. For suppressed (no contractions, n=0): Q = 1.84LH^(3/2). Used in practice for field measurement of river/canal flow.
Related Fluid Mechanics MCQs
More solved Fluid Mechanics questions for AE/JE Civil Engineering exams.
- The 'tsunami' is distinguished from wind waves by:
- The 'specific energy' in open channel flow is:
- The 'draft tube' in a reaction turbine (Francis/Kaplan) serves to:
- 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 JE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.