The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids

Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will

A

Increase

B

Decrease

C

Remain unchanged

D

Data insufficient to predict relative pressure drop

In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant?

A

Rotational

B

Unsteady

C

Turbulent

D

Non-uniform

The boundary layer is that part of a moving fluid, in which the fluid velocity is

A

Affected by the fluid flow pressure

B

Constant

C

Affected by the presence of a solid boundary

D

All of the above

The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to

A

$$ - \frac{1}{3}$$

B

$$ - \frac{2}{3}$$

C

1

D

$$-1$$

The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is

A

[

A.

B. 1

B

> 1

C

2

Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is

A

1

B

> 1

C

> 5

Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.

A

3, 3, 1, 7

B

3, 2, 1, none

C

3, 2, 1, 7

D

3, 3, 2, none

E

All of the above

At the point of boundary layer separation in fluid flow, the

A

Shear stress is maximum

B

Velocity gradient is flat

C

Density variation is maximum

D

Shear stress is zero

In fluid flow, the boundary layer separation can not occur

A

In case of boundaries experiencing form drag

B

At points of abrupt changes in the flow directions

C

In laminar flow

D

None of these

Existence of boundary layer in fluid flow is because of the

A

Surface tension

B

Fluid density

C

Fluid viscosity

D

Gravity forces

The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids

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