Hydraulics and Fluid Mechanics - Mechanical Engineering Questions and Answers

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When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures.

sum

difference

arithmatic mean

geometric mean

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The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (Ï) and rotating at (Ï‰) rad/s is

ρ ω² r²

2ρ ω² r²

\(\frac { \rho \omega^2 r^2 } { 2 }\)

\(\frac { \rho \omega^2 r^2 } { 4 }\)

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When the Mach number is between __________ the flow is called super-sonic flow.

1 and 2.5

2.5 and 4

4 and 6

1 and 6

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The property of a liquid which controls its rate of flow is called viscosity.

True

False