Hydraulics and Fluid Mechanics - Mechanical Engineering Questions and Answers

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Coefficient of resistance is the ratio of

actual velocity of jet at vena contracta to the theoretical velocity

area of jet at vena contracta to the area of orifice

loss of head in the orifice to the head of water available at the exit of the orifice

actual discharge through an orifice to the dieoretical discharge

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Euler's equation in the differential form for the motion of liquids is given by

\(\frac { dp } { \rho } + g.dz + v.dv\) = 0

\(\frac { dp } { \rho } - g.dz + v.dv\) = 0

ρ.dp + g.dz + v.dv = 0

ρ.dp - g.dz + v.dv = 0

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In order to measure the flow with a venturimeter, it is installed in

horizontal line

inclined line with flow upwards

inclined line with flow downwards

any direction and in any location

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The discharge through a large rectangular orifice is given by (where H₁ = Height of the liquid above the top of the orifice, H₂ = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and C_d = Coefficient of discharge)

Q = \(\frac { 2 } { 3 }\) Cd x b \(\sqrt2g\) (H₂ - H₁)

Q = \(\frac { 2 } { 3 }\) Cd x b \(\sqrt2g\) (H₂^1/2 - H₁^1/2)

Q = \(\frac { 2 } { 3 }\) Cd x b \(\sqrt2g\) (H₂^3/2 - H₁^3/2)

Q = \(\frac { 2 } { 3 }\) Cd x b \(\sqrt2g\)(H₂² - H₁²)