HYDRAULICS & FLUID MECHANICS QUIZ

A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of

4.8 M

4.0 M

4.6 M

4.2 M

TRUE ANSWER : ?
YOUR ANSWER : ?

Free surface of a liquid tends to contract to the smallest possible area due to force of

viscosity

surface tension

cohesion

friction

TRUE ANSWER : ?
YOUR ANSWER : ?

The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to

9810 PA

981 PA

91 PA

1 PA

TRUE ANSWER : ?
YOUR ANSWER : ?

The surface tension of mercury at normal temperature compared to that of water is

more or less depending on size of glass tube

less

same

more

TRUE ANSWER : ?
YOUR ANSWER : ?

The line of action of the buoyant force acts through the centroid of the

displaced volume of the fluid

volume of the fluid vertically above the body

volume of the floating body

submerged body

TRUE ANSWER : ?
YOUR ANSWER : ?

The discharge over a broad crested weir is maximum when the depth of flow is (where H is the available head)

H/3

2 H/5

2 H/3

H/2

TRUE ANSWER : ?
YOUR ANSWER : ?

The continuity equation pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid (where pi and p2 are mass densities.)

steady flow

incompressible flow

uniform flow

frictionless flow

TRUE ANSWER : ?
YOUR ANSWER : ?

The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is

always below the centroid of the area

None of these

at the centroid of the submerged area

always above the centroid of the area

TRUE ANSWER : ?
YOUR ANSWER : ?

The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if

the area is inclined

All of these

the area is horizontal

the area is vertical

TRUE ANSWER : ?
YOUR ANSWER : ?

To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than

2.4 m above the hydraulic gradient

6.4 m above the hydraulic gradient

10.0 m above the hydraulic gradient

5.0 above the hydraulic gradient

TRUE ANSWER : ?
YOUR ANSWER : ?

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