Mechanical Engineering - Hydraulics and Fluid Mechanics

6. 

The discharge over a rectangular weir, considering the velocity of approach, is (where H1 = Total height of water above the weir = H + Ha H = Height of water, over the crest of the weir, and Ha = Height of water, due to velocity of approach)

A. Cd x L2g [H1 - Ha]
B. Cd x L2g [H13/2 - Ha3/2]
C. Cd x L2g [H12 - Ha2]
D. Cd x L2g [H15/2 - Ha5/2]

Answer: Option B

Explanation:

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7. 

A flow in which __________ force is dominating over the viscosity is called turbulent flow.

A. elastic
B. surface tension
C. viscous
D. inertia

Answer: Option D

Explanation:

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8. 

If an incompressible liquid is continuously flowing through a pipe, the quantity of liquid passing per second is different at different sections.

A. True
B. False

Answer: Option B

Explanation:

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9. 

The atmospheric pressure at sea level is

A. 103 kN/m2
B. 10.3 m of water
C. 760 mm of mercury
D. all of these

Answer: Option D

Explanation:

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10. 

When the pressure intensity at a point is less than the local atmospheric pressure, then the difference of these two pressures is called vacuum pressure.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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