Related Questions

Drag is defined as the force exerted by the
A Fluid on the solid in a direction opposite to flow
B Fluid on the solid in the direction of flow
C Solid on the fluid
D None of these
When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow.
A Less than
B More than
C Equal to
D None of these
According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.
A No component is concentrated at the surface of the solution
B The component molecules are non polar and are of almost equal size
C In the formation of solution, chemical combination/molecular association between unlike molecules takes place
D The attractive forces between like and unlike molecules are almost equal
Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the
A Sizes of the component molecules are approximately equal
B Attractive forces between like and unlike molecules are approximately equal
C Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution
D All of the above
Drag co-efficient for flow past immersed body is the ratio of __________ to the product of velocity head and density.
A Shear stress
B Shear force
C Average drag per unit projected area
D None of these
With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on
A a circular disc of plate held normal to flow
B a sphere
C a cylinder
D a streamlined body
Deformation drag, which is caused by widespread deformation of fluid around the immersed body
A Occurs when NRe is very small
B Is primarily a friction drag
C Is independent of body length
D Depends mainly on cross-sectional shape
In which of the following the friction drag is generally larger than pressure drag?
A a circular disc or plate held normal to flow
B a sphere
C a cylinder
D an airfoil
The ratio of wall drag to total drag in the Stoke's law range is
A 0.5
B 1
C $$\frac{1}{3}$$
D $$\frac{2}{3}$$
The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is
A 0.5
B 1
C 2
D 0.33

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