Hydraulics And Fluid Mechanics In Me - Study Mode

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[#401] An error of 1% in measuring head over the apex of the notch (H) will produce an error of _________ in discharge over a triangular notch.

(A) 1%

(B) 1.5%

(C) 2%

(D) 2.5%

Correct Answer

(D) 2.5%

[#402] Axial flow pump is started with its delivery valve

(A) Kept fully closed

(B) Kept fully open

(C) Irrespective of any position

(D) Kept 50% open

Correct Answer

(B) Kept fully open

[#403] Centrifugal pump is started with its delivery valve

(A) Kept fully closed

(B) Kept fully open

(C) Irrespective of any position

(D) Kept 50% open

Correct Answer

(A) Kept fully closed

[#404] In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle $$ heta $$. Sensitivity of inclined tube to sensitivity of U-tube is equal to

(A) $$sin heta $$

(B) $$frac{1}{{sin heta }}$$

(C) $$cos heta $$

(D) $$frac{1}{{cos heta }}$$

Correct Answer

(B) $$frac{1}{{sin heta }}$$

[#405] If V 1 and V 2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

(A) $$frac{{{{ ext{V}}_1} - {{ ext{V}}_2}}}{{{{ ext{V}}_1}}}$$

(B) $$frac{{{ ext{V}}_1^2 - { ext{V}}_2^2}}{{{ ext{V}}_1^2}}$$

(C) $$frac{{{{ ext{V}}_1}}}{{{{ ext{V}}_1} - {{ ext{V}}_2}}}$$

(D) $$frac{{{ ext{V}}_1^2}}{{{ ext{V}}_1^2 - { ext{V}}_2^2}}$$

Correct Answer

(B) $$frac{{{ ext{V}}_1^2 - { ext{V}}_2^2}}{{{ ext{V}}_1^2}}$$