Fluid Mechanics & Machinery

In a Fluid statics which one of following statements is correct?

• Shear stress is zero

• No relative motion between adjacent fluid layers

• Velocity gradient is zero

• All the these

Center of pressure is the point of application of the _______ force on the surface.

• Total Pressure force

• total buoyancy force

• both pressure and buoyancy force

• none of these

Centre of pressure on a horizontal plane surface under uniform pressure is at ________

• Above the centroid of surface

• centroid of the surface

• below the centroid of surface

• none of these

A rectangular plate 2m wide and 5m long is immersed in water in such a way as horizontally 1m below the free surface of water. Then Total Pressure value is ______kN

• 98.1

• 0098

• 100

• 9.81

A rectangular plate 7m wide and 15m long is immersed in water in such a way as horizontally 2m below the free surface of water. Then Position of centre of pressure is ______

• 1m deep from free liquid surface

• 2m deep from free liquid surface

• 0.5m deep from free liquid surface

• 5m deep from free liquid surface

Metallic body which floats at interface of mercury of specific gravity 13.6 and water. The 50% of volume of body is submersed in mercury and 50% in water. Then Density of metallic body is given by _______

• 6670 Kg/ cubic m

• 7600 Kg/ cubic m

• 7000 Kg/ cubic m

• 7300 Kg/ cubic m

In a stable equilibrium for stability of submersed body,______

• G is above B

• G is below B

• G and B are at the same point

• none of these

In a unstable equilibrium for stability of submersed body,______

• G is above B

• G is below B

• G and B are at the same point

• none of these

In a Neutral equilibrium for stability of submersed body,______

• G is above B

• G is below B

• G and B are at the same point

• none of these

In a stable equilibrium of stability of floating bodies, _______

• M is above B

• M is below B

• M and B are at the same point

• none of these