Hydraulics and Fluid Mechanics - Mechanical Engineering Questions and Answers

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The point at which the resultant pressure on an immersed surface acts, is known as

centre of gravity

centre of depth

centre of pressure

centre of immersed surface

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A tank of uniform cross-sectional area (A) containing liquid upto height (H₁) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H₁ to H₂ will be

\(\frac { 2 A\sqrt{H_1} } { C_d \times a\sqrt{2g} }\)

\(\frac { 2 A\sqrt{H_2} } { C_d \times a\sqrt{2g} }\)

\(\frac { 2 A(\sqrt{H_1} - \sqrt{H_2})} { C_d \times a\sqrt{2g} }\)

\(\frac { 2 A({H_1^\frac{3}{2}} - {H_2^\frac{3}{2}})} { C_d \times a\sqrt{2g} }\)

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The torque required to overcome viscous resistance of a collar bearing is (where R₁ and R₂ = External and internal radius of collar)

\(\frac { \mu n^2 N } { 60 t } (R_1 - R_2)\)

\(\frac { \mu n^2 N } { 60 t } (R_1^2 - R_2^2)\)

\(\frac { \mu n^2 N } { 60 t } (R_1^3 - R_2^3)\)

\(\frac { \mu n^2 N } { 60 t } (R_1^4 - R_2^4)\)

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A notch is used to measure __________ of liquids.

pressure

discharge

velocity

volume