Drag is the force component exerted on an immersed object,

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 N_Re 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

Drag is the force component exerted on an immersed object,

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