21. The Francis formula for the discharge over Cippoletti weir is
A. 1.84 LH1/2
B. 1.84 LH
C. 1.84 LH3/2
D. 1.84 LH5/2
22. Laminar flow __________ place at very low velocities.
A. takes
B. does not take
23. A manometer can be used to measure vacuum pressures.
A. Agree
B. disagree
24. The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by
25. The tendency of a liquid to uplift a submerged body, because of the upward thrust of the liquid, is known as buoyancy.
A. Agree
B. Disagree
26. An open tank containing liquid is made to move from rest with a uniform acceleration. The angle θ which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)
A. tan θ = a/g
B. tan θ = 2 a/g
C. tan θ = a/2g
D. tan θ = a2/2g
27. The discharge over a triangular notch is
A. inversely proportional to H3/2
B.directly proportional to H3/2
C.inversely proportional to H5/2
D.directly proportional to H5/2
28. The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece)
29. The loss of pressure head in case of laminar flow is proportional to
A. velocity
B. (velocity)2
C. (velocity)3
D. (velocity)4
30. The flow of water through the hole in the bottom of a wash basin is an example of
A. steady flow
B. uniform flow
C. free vortex
D. forced vortex