Test: Laminar Flow in Pipes - 1 - Civil Engineering (CE) MCQ

# Test: Laminar Flow in Pipes - 1 - Civil Engineering (CE) MCQ

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## 10 Questions MCQ Test GATE Civil Engineering (CE) 2024 Mock Test Series - Test: Laminar Flow in Pipes - 1

Test: Laminar Flow in Pipes - 1 for Civil Engineering (CE) 2024 is part of GATE Civil Engineering (CE) 2024 Mock Test Series preparation. The Test: Laminar Flow in Pipes - 1 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Laminar Flow in Pipes - 1 MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Laminar Flow in Pipes - 1 below.
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Test: Laminar Flow in Pipes - 1 - Question 1

### In a laminar flow between two static parallel plates, the velocity at mid-point is found to be 2.0 m/s. If the space between the plates is 10 cm, then the discharge per unit width (in m3/s/m) will be

Detailed Solution for Test: Laminar Flow in Pipes - 1 - Question 1

The average velocity
= 2/3 x 2 = 4/3 m/s
The discharge per unit width
= 4/3 x 0.1 = 0.13 m3/s/m

Test: Laminar Flow in Pipes - 1 - Question 2

### An oil of viscosity 9 poise is flowing through a horizontal pipe of 60 mm diameter. If the flow is laminar, the pressure drop in 100 m length of the pipe is 1800 kN/m2. The average velocity of flow of the oil is

Detailed Solution for Test: Laminar Flow in Pipes - 1 - Question 2

1 poise = 0.1 N-s/m2
∴

∴

Test: Laminar Flow in Pipes - 1 - Question 3

### The Chezy's coefficient C is related to Darcy- Weisbach friction factor ‘f’ as

Detailed Solution for Test: Laminar Flow in Pipes - 1 - Question 3

(Darcy-Weisbach equation for non- circular section)

Equating both equations, we get

Test: Laminar Flow in Pipes - 1 - Question 4

A circular pipe of radius R carries a laminar flow of a fluid. The average velocity is indicated as the local velocity at what radial distance, measured from the centre?

Detailed Solution for Test: Laminar Flow in Pipes - 1 - Question 4

For laminar flow in a circular pipe, the local velocity may be given as,

For laminar flow in a circular pipe, the average velocity may be given as,
......(ii)

Equating (i) and (ii), we get,

Test: Laminar Flow in Pipes - 1 - Question 5

The velocity at which the laminar flow ceases, is known as

Detailed Solution for Test: Laminar Flow in Pipes - 1 - Question 5

The velocity at which the flow changes from the laminar to turbulent for the case of a given fluid at a given temperature and in a given pipe is known as critical velocity. The state of flow in between these two types of flow is known as ‘transitional state’.

Test: Laminar Flow in Pipes - 1 - Question 6

The ratio of maximum velocity to average velocity for steady flow between fixed parallel plates is:

Detailed Solution for Test: Laminar Flow in Pipes - 1 - Question 6

For a laminar flow between parallel plates:

Test: Laminar Flow in Pipes - 1 - Question 7

The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is

Detailed Solution for Test: Laminar Flow in Pipes - 1 - Question 7

Shear stress distribution between the parallel plates is given by,

It has same maximum value at either boundary and decreases linearly to zero at the mid plane.

Test: Laminar Flow in Pipes - 1 - Question 8

The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is

Test: Laminar Flow in Pipes - 1 - Question 9

Consider the following statements with reference to steady laminar flow
1. shear stress is zero at the centre.
2. discharge varies directly with viscosity of the fluid flowing.
3. velocity is maximum at the centre.
4. hydraulic gradient varies directly with the velocity.

Which of these statements is/are correct?

Detailed Solution for Test: Laminar Flow in Pipes - 1 - Question 9

Test: Laminar Flow in Pipes - 1 - Question 10

In a laminar flow through a circle pipe of diameter 20 cm, the maximum velocity is found to be 1 m/s. The velocity at a radial distance of 5 cm from the axis of the pipe will be

Detailed Solution for Test: Laminar Flow in Pipes - 1 - Question 10

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## GATE Civil Engineering (CE) 2024 Mock Test Series

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