# Mechanical Engineering - Hydraulics and Fluid Mechanics

### Exercise :: Hydraulics and Fluid Mechanics - Section 3

1.

In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.

 A. equal to B. one-fourth C. one-third D. one-half

Explanation:

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2.

Viscous force is the __________ of shear stress due to viscosity and cross-sectionar area of flow.

 A. sum B. different C. product D. ratio

Explanation:

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3.

The density of air is same at different heights.

 A. Correct. B. Incorrect

Explanation:

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4.

The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)

 A. w.A B. wx C. wAx D. wA/x

Explanation:

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5.

A body floating in a liquid is said to be in a stable equilibrium, if its metacentre coincides with its centre of gravity.

 A. True B. False