Hydraulic and Fluid Machines - Interview Questions | Exam2Win

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21. Choose the wrong statement

A. The horizontal component of the hydro-static force on any surface is equal to the normal force on the verti�cal projection of the surface

B. The horizontal component acts through the centre of pressure for the vertical projection

C. The vertical component of the hydros-tatic force on any surface is equal to the weight of the volume of the liquid above the area

D. he vertical component passes through the centre of pressure of the volume

E. Centre of pressure acts at a greater depth than centre of gravity.

Explanation:

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

A. submerged body

B. volume of the floating body

C. volume of the fluid vertically above the body

D. displaced volume of the fluid

E. none of the above.

Explanation:

23. Choose the wrong statement

A. The centre of buoyancy is located at the centre of gravity of the displaced liquid

B. For stability of a submerged body, the centre of gravity of body must lie directly below the centre of buoyancy

C. If e.g. and centre of buoyancy coin�cide, the submerged body must lie at neutral equilibrium for all positions

D. For stability of floating cylinders or spheres, the e.g. of body must lie below the centre of buoyancy

E. All floating bodies are stable.

Explanation:

24. In a static fluid

A. resistance to shear stress is small

B. fluid pressure is zero

C. linear deformation is small

D. only normal stresses can exist

E. viscosity is nil.

Explanation:

25. The df pth of the centre of pressure on a vertical rectangular gate m wide and 6 m high, when the water surface coincides with the top of the gate, is

A. 2.4 m

B. 3.0 m

C. 4.0 m

D. "2.5 m

E. 5.0 m.

Explanation:

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