For a most economical rectangular channel, the hydraulic mean depth, is equal to

the depth of flow

one-third depth of flow

half the depth of flow

None of the above

Correct Answer : half the depth of flow

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An orifice is taken as large if

(H₂ - H₁) > H

(H₂ - H₁) > H/2

(H₂ - H₁) > H/4

(H₂ - H₁) > H/3

Correct Answer : Option (D) : (H₂ - H₁) > 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%

2.0%

2.5%

4.5%

Correct Answer : Option (C) : 2.5%

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