Mechanical Engineering - Hydraulics and Fluid Mechanics

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

Answer: Option B

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

Answer: Option C

Explanation:

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3. 

The density of air is same at different heights.

A. Correct.
B. Incorrect

Answer: Option B

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

Answer: Option C

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

Answer: Option B

Explanation:

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