Civil Engineering > GATE 2019 SET-1 > Fluid Mechanics
A circular duct carrying water gradually contracts from a diameter of 30 cm to 15 cm. The figure (not drawn to scale) shows the arrangement of differential manometer attached to the duct.
When the water flows, the differential manometer shows a deflection of 8 cm of mercury (Hg). The values of specific gravity of mercury and water are 13.6 and 1.0, respectively. Consider the acceleration due to gravity, g = 9.81 m/s2.
Assuming frictionless flow, the flow rate (in m3/s, round off to 3 decimal places) through the duct is _______.

Correct : 0.078 to 0.085

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