With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on

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

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

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 velocity at which the flow changes from laminar flow to turbulent flow is called

A

Critical velocity

B

Velocity of approach

C

Sub-sonic velocity

D

Super-sonic velocity

Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the

A

Length of the pipe

B

Diameter of the pipe

C

Density of the fluid

D

Velocity of the fluid

Drag is the force component exerted on an immersed object,

A

Passing the centroid of the body at 60°to the direction of motion

B

The component being parallel to theflow direction

C

The component being normal to the flow direction

D

None of these

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 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

In which of the following body shapes, the pressure drag is large compared to the friction drag?

A

Stream line body

B

Two dimensional body

C

Bluff body

D

None of these

With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on

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