Canal and Pipe Flow Design MCQs 25 Score: 0 Attempted: 0/25 Subscribe 1. : Kennedy’s theory of canal design is based on: (A) Critical velocity of flow to prevent silting and scouring (B) Manning’s equation (C) Lacey’s regime theory (D) Darcy–Weisbach law 2. : Lacey’s regime theory is applicable to: (A) Non-alluvial canals (B) Alluvial canals in equilibrium with flow and sediment load (C) Rocky canals (D) Pipe irrigation systems 3. : The critical velocity ratio (CVR) in Kennedy’s theory is: (A) Ratio of actual velocity to critical velocity (B) Ratio of sediment load to discharge (C) Ratio of hydraulic radius to slope (D) Ratio of depth to velocity head 4. : The most economical channel section is the one which: (A) Minimizes wetted perimeter for a given area (B) Maximizes slope (C) Uses concrete lining only (D) Has maximum velocity 5. : Hydraulic radius (R) is defined as: (A) Flow area / wetted perimeter (B) Wetted perimeter / flow area (C) Velocity / slope (D) Area × velocity 6. : In Manning’s formula, velocity of flow is proportional to: (A) Hydraulic radius^(2/3) and slope^(1/2) (B) Area × slope (C) Wetted perimeter only (D) Velocity head 7. : The main cause of silting in canals is: (A) Low velocity below critical value (B) Very high velocity (C) Lined sections (D) Steep slopes 8. : The main cause of scouring in canals is: (A) Velocity higher than non-scouring velocity (B) Velocity lower than critical value (C) Sediment-free water (D) Use of pipe outlets 9. : The regime velocity in Lacey’s theory depends on: (A) Discharge and silt factor (B) Only discharge (C) Only bed slope (D) Hydraulic radius only 10. : The silt factor ‘f’ in Lacey’s theory depends on: (A) Particle size of sediment (B) Flow velocity (C) Canal depth (D) Canal discharge 11. : In a circular pipe flowing full, the hydraulic radius (R) is: (A) D/4 (B) D/2 (C) D/8 (D) D 12. : The formula used for pipe head loss due to friction is: (A) Darcy–Weisbach equation (B) Kennedy’s equation (C) Chezy’s equation (D) Lacey’s equation 13. : The loss of head due to sudden enlargement of pipe is proportional to: (A) (v₁ – v₂)² / 2g (B) v²/2g (C) hf × L/D (D) Roughness factor only 14. : The continuity equation for incompressible fluid flow is: (A) A₁V₁ = A₂V₂ (B) A₁/V₁ = A₂/V₂ (C) Q = A/V (D) A × V² = constant 15. : Bernoulli’s equation represents the principle of: (A) Conservation of momentum (B) Conservation of energy (C) Conservation of mass (D) Conservation of velocity 16. : In a pipeline system, water hammer occurs due to: (A) Sudden closure of valve (B) Air lock (C) Sedimentation (D) Pipe friction 17. : In a most economical trapezoidal channel section, the condition is: (A) Half of top width = sloping side (B) Depth = hydraulic mean depth (C) Hydraulic radius = half of depth (D) Bed width = depth × (√2 – 1) 18. : In an open channel, Froude number (Fr) is defined as: (A) V/√(gD) (B) √(gD)/V (C) V²/g (D) V/gD 19. : Flow is critical when Froude number is: (A) < 1 (C) = 1 (D) = 0 20. : The Reynolds number is used to determine: (A) Type of flow (laminar or turbulent) (B) Head loss in pipe (C) Flow velocity in canal (D) Flow depth in channel 21. : In Lacey’s theory, wetted perimeter (P) of a stable channel is proportional to: (A) √Q (B) Q^(1/3) (C) Q^(1/2) (D) Q^(3/2) 22. : For maximum discharge through a circular channel running half full, the hydraulic radius is: (A) D/4 (B) D/8 (C) D/2 (D) D/6 23. : The Darcy friction factor in pipe flow depends on: (A) Reynolds number and relative roughness (B) Only pipe diameter (C) Only velocity (D) Only slope 24. : The total head loss in a pipe system is equal to: (A) Friction losses + minor losses (B) Only friction losses (C) Only velocity head (D) Elevation head only 25. : The main design objective of canals and pipe flow systems is: (A) Preventing erosion, ensuring stability, and providing adequate discharge (B) Maximizing velocity only (C) Reducing wetted perimeter only (D) Increasing energy losses Agricultural Engineering MCQs🔹 1. 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