Mechanical Engineering - Hydraulics and Fluid Mechanics

26. 

An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 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

Answer: Option A

Explanation:

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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

Answer: Option D

Explanation:

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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)

A. 0.855 a2gH
B. 1.855 aH2g
C. 1.585 a2gH
D. 5.85 aH2g

Answer: Option A

Explanation:

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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

Answer: Option A

Explanation:

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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

Answer: Option C

Explanation:

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