Hydraulics and Fluid Mechanics – Section 2

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

Correct Answer: C. 1.84 LH3/2

22. Laminar flow __________ place at very low velocities.

A. takes
B. does not take

Correct Answer: A. takes

23. A manometer can be used to measure vacuum pressures.

A. Agree
B. disagree

Correct Answer: A. Agree

24. The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by

hfm-se2-24

Correct Answer: Option D

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

Correct Answer: A. Agree

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

Correct Answer: A. tan θ = a/g

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

Correct Answer: 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)

hfm-se2-28

Correct Answer: Option A

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

Correct Answer: A. velocity

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

Correct Answer: C. free vortex

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