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This mock test of Test: Turbulent Flow - 2 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam.
This contains 9 Multiple Choice Questions for Mechanical Engineering Test: Turbulent Flow - 2 (mcq) to study with solutions a complete question bank.
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QUESTION: 1

In a turbulent flow in a pipe, the shear stress is

Solution:

shear stress variation where y is distance from pipe wall, so, the shear stress varies linearly with the distance from the boundary to become zero at the center.

QUESTION: 2

Water of kinematic viscosity v = 1 centistoke flows through a 10 mm diameter pipe. The critical flow in this pipe would correspond to a discharge of approximately

Solution:

QUESTION: 3

Shear velocity is

Solution:

QUESTION: 4

Friction factor f in laminar and turbulent flow in a pipe varies as Re^{-1} and Re^{-0.25} respectively. If V\s the average velocity, the pressure drop in a horizontal pipe for laminar and turbulent flow respectively will be proportional to

Solution:

QUESTION: 5

For hydrodynamically smooth pipes, the friction factor f

Solution:

QUESTION: 6

The critical value of reynolds number for transition from laminar to turbulent boundary layer in external flows is taken as

Solution:

Critical Reynolds number for external flow

(Re)_{Cr} = 5 x 10^{5}

QUESTION: 7

The logarithmic velocity distributions observed in

Solution:

Logarithmic profile exist is in turbulent flow.

QUESTION: 8

In a fully turbulent flow through a rough pipe, the friction factor ‘f’ is (Re is Reynolds number and ξ_{s}/D is relative roughness)

Solution:

QUESTION: 9

Using the Prandtl's mixing length concept, how is the turbulent shear stress expressed?

Solution:

Turbulent shear stress

(Smarter way to solve this kind of question is to check for units)

### Turbulent Flow

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### Turbulent Flow

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