# Mechanical Engineering - Hydraulics and Fluid Mechanics

### Exercise :: Hydraulics and Fluid Mechanics - Section 2

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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