Mechanical Engineering - Hydraulics and Fluid Mechanics

41. 

A notch is, usually, made of a metallic plate.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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42. 

In an internal mouthpiece, if the jet after contraction expands and fills up the whole mouthpiece, then the mouthpiece is said to be running free.

A. True
B. False

Answer: Option B

Explanation:

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43. 

A channel is said to be of most economical cross-section, if

A. it gives maximum discharge for a given cross-sectional area and bed slope
B. it has minimum wetted perimeter
C. it involves lesser excavation for the designed amount of discharge
D. all of the above

Answer: Option D

Explanation:

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44. 

The top of the weir over which the water flows is known as

A. sill or crest
B. nappe or vein
C. orifice
D. none of these

Answer: Option A

Explanation:

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45. 

A moving fluid mass may be brought to a static equilibrium position, by aplying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called

A. Pascal's law
B. Archimede's principle
C. D-Alembert's principle
D. none of these

Answer: Option C

Explanation:

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