Most economical section of a circular channel for maximum discharge________.

Civil Engineering : Hydraulics - Quiz(MCQ)

wetted perimeter = 2.83 depth of water

depth of water = 0.95 diameter of circular section

ydraulic mean depth = 0.286 diameter of circular section

All of the above

Correct Answer : All of the above

Explanation : * wetted perimeter = 2.83 depth of water
* depth of water = 0.95 diameter of circular section
* hydraulic mean depth = 0.286 diameter of circular section
* wetted perimeter = 2.6 diameter of circular section

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An orifice is taken as large if

(Hâ‚‚ - Hâ‚) > H

(Hâ‚‚ - Hâ‚) > H/2

(Hâ‚‚ - Hâ‚) > H/4

(Hâ‚‚ - Hâ‚) > H/3

Correct Answer : Option (D) : (Hâ‚‚ - Hâ‚) > H/3

A closed cylindrical vessel of 100 cm diameter and 200 cm high is completely filled with a liquid (sp. weight 1600 kg/m3) when rotated about its vertical axis at 100 r.p.m. The total pressure on its lid, is

459 kg

549 kg

945 kg

954 kg

Correct Answer : Option (D) : 954 kg

An error of 1% in measuring the head of water over the crest of a triangular notch, produces an error in the discharge which is equal to

1.5%

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Correct Answer : Option (C) : 2.5%