Test: Turbulent Flow in Pipes - Civil Engineering (CE) MCQ

# Test: Turbulent Flow in Pipes - Civil Engineering (CE) MCQ

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## 9 Questions MCQ Test GATE Civil Engineering (CE) 2025 Mock Test Series - Test: Turbulent Flow in Pipes

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Test: Turbulent Flow in Pipes - Question 1

### The cause of turbulence in fluid flow may be

Test: Turbulent Flow in Pipes - Question 2

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

Detailed Solution for Test: Turbulent Flow in Pipes - Question 2

In turbulent flow shear stress
τ = τ0 (1 - y/r0
where,
y = Distance measured from pipe wall
ζ0 = Shear stress at boundary

Test: Turbulent Flow in Pipes - Question 3

### In the case of turbulent flows in circular pipes, the maximum velocity um and the mean velocity V are related as (um - V)lu =

Detailed Solution for Test: Turbulent Flow in Pipes - Question 3

Turbulent flow
For smooth pipe,

Average velocity,

y = distance measured from pipe boundary
u = shear velocity

from equation (i)

(iii) - (ii) gives
(b) Rough pipe

It gives,

same for both pipes rough or smooth

Test: Turbulent Flow in Pipes - Question 4

The distance from pipe boundary, at which the turbulent shear stress is one-third the wall shear stress, is

Detailed Solution for Test: Turbulent Flow in Pipes - Question 4

In turbulent flow shear stress at distance y from pipe boundary,

Test: Turbulent Flow in Pipes - Question 5

A flow in which the quantity of liquid flowing per second is not constant, is called

Detailed Solution for Test: Turbulent Flow in Pipes - Question 5

A fluid motion is said to be turbulent when the fluid particles move in an entirely haphazard or disorderly manner, that results in a rapid and continuous mixing of the fluid leading to momentum transfer as flow occurs. At any point in a turbulent flow the velocity and pressure are the functions of time thereby rendering such a flow as unsteady.

Test: Turbulent Flow in Pipes - Question 6

Which of following conditions would entail a greater energy dissipation in turbulent flow?
1. Smaller eddy size
2. Lower viscosity
3. Large intensity of turbulence

Select the correct answer using the codes given below:

Detailed Solution for Test: Turbulent Flow in Pipes - Question 6

Explanation:

1. Smaller eddy size: Turbulent flow consists of swirling vortices or "eddies". The smaller the eddy, the higher the rate of energy dissipation. This is because smaller eddies have a higher surface area to volume ratio, leading to higher friction and thus more energy dissipation.

2. Lower viscosity: Viscosity is a measure of a fluid's resistance to shear or flow. Lower viscosity means less resistance to flow, allowing for more turbulence and thus more energy dissipation.

3. Large intensity of turbulence: The greater the turbulence, the more energy is dissipated. Turbulence involves the random and chaotic motion of fluid particles, which leads to a high rate of energy dissipation.

So, all these factors - smaller eddy size, lower viscosity, and large intensity of turbulence - would entail a greater energy dissipation in turbulent flow.

Test: Turbulent Flow in Pipes - Question 7

Match List-I (Nature of flow) with List-II (Friction factor equation) and select the correct answer using the codes given below the lists:
List- I
1.Turbulent flow with rough boundary
2. Turbulent flow with smooth boundary
3. Turbulent flow with Re < 105
4. Laminar flow

Test: Turbulent Flow in Pipes - Question 8

Turbulent flow generally occurs

Detailed Solution for Test: Turbulent Flow in Pipes - Question 8

Reynolds number, Re = Vd/v
When Re < Rec Laminar flow occurs at very small velocities or through narrow passage (small d) or for highly viscous fluids (high v) the Re will be small and flow will remain laminar. For high velocities through large passage Reynolds number will be sufficient to cause turbulence.

Test: Turbulent Flow in Pipes - Question 9

A pipe line carrying water has surface-protrusions of average height 0.10 mm. If the shear stress developed is 7.85 N/m2, then the pipe surface will act as

Detailed Solution for Test: Turbulent Flow in Pipes - Question 9

ks = 0.10 mm
τ = 7.85 N/m2

Since roughness value lies between 4 and 100 the pipe act as in transition.

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