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Test: Design Elements Of Sedimentation - Civil Engineering (CE) MCQ


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10 Questions MCQ Test Environmental Engineering - Test: Design Elements Of Sedimentation

Test: Design Elements Of Sedimentation for Civil Engineering (CE) 2024 is part of Environmental Engineering preparation. The Test: Design Elements Of Sedimentation questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Design Elements Of Sedimentation MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Design Elements Of Sedimentation below.
Solutions of Test: Design Elements Of Sedimentation questions in English are available as part of our Environmental Engineering for Civil Engineering (CE) & Test: Design Elements Of Sedimentation solutions in Hindi for Environmental Engineering course. Download more important topics, notes, lectures and mock test series for Civil Engineering (CE) Exam by signing up for free. Attempt Test: Design Elements Of Sedimentation | 10 questions in 25 minutes | Mock test for Civil Engineering (CE) preparation | Free important questions MCQ to study Environmental Engineering for Civil Engineering (CE) Exam | Download free PDF with solutions
Test: Design Elements Of Sedimentation - Question 1

The detention period of a rectangular tank is given by

Detailed Solution for Test: Design Elements Of Sedimentation - Question 1

Explanation: The detention period of a rectangular tank is given by t0= LBH/Q where L is the length, B, is the breadth and H is the height of rectangular tank and Q= discharge rate.

Test: Design Elements Of Sedimentation - Question 2

The average time required by water to pass through the settling tank is called _______

Detailed Solution for Test: Design Elements Of Sedimentation - Question 2

Explanation: The average time required by water to pass through the settling tank is called ‘flowing through period’ which is always less than the detention period.

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Test: Design Elements Of Sedimentation - Question 3

Range of Displacement efficiency in the plain sedimentation tank is

Detailed Solution for Test: Design Elements Of Sedimentation - Question 3

Explanation: Displacement efficiency is defined as the ratio of flowing through period to the detention period and varies from 0.25 to 0.5 in the plain sedimentation tank.

Test: Design Elements Of Sedimentation - Question 4

 The quantity of water flowing per hour per unit horizontal area is called ____

Detailed Solution for Test: Design Elements Of Sedimentation - Question 4

Explanation: Overflow rate = Q/A where Q is discharge rate in litre per day, A is the horizontal area in m2.

Test: Design Elements Of Sedimentation - Question 5

 Settling tank efficiency is reduced by
1. Eddy current
2. Surface current
3. Density current

Detailed Solution for Test: Design Elements Of Sedimentation - Question 5

Explanation: Eddy current is set up by the inertia of the incoming fluid, surface current is induced due to wind in open tank and density current cause cold water to under run the warm water to flow across its surface.

Test: Design Elements Of Sedimentation - Question 6

 1cm per second settling velocity corresponds to a surface loading of ______ litre per day per m

Detailed Solution for Test: Design Elements Of Sedimentation - Question 6

Explanation: Surface loading = 864000*settling velocity = 864000*1=864000litre per day per m2 where settling velocity is in cm/Sec.

Test: Design Elements Of Sedimentation - Question 7

 What will be the surface area of the basin for a flow of 2*106 litre per day having a surface loading rate 10,000 litre/day/m2

Detailed Solution for Test: Design Elements Of Sedimentation - Question 7

Explanation: Surface area of basin= flow of water/surface loading rate = 2000000/10000=200m2.

Test: Design Elements Of Sedimentation - Question 8

 The detention period of the vertical flow clarifier is

Detailed Solution for Test: Design Elements Of Sedimentation - Question 8

Explanation: Typical design value of the detention period for the vertical flow clarifier is between 1 to 1.5 hours. They normally remove the flocculent.

Test: Design Elements Of Sedimentation - Question 9

 The design value of surface loading for horizontal flow circular sedimentation is 

Detailed Solution for Test: Design Elements Of Sedimentation - Question 9

Explanation: For the design of horizontal flow circular sedimentation, the surface loading rate is 30-40m3/m2/d and its design detention period period is 2-2.5 hours.

Test: Design Elements Of Sedimentation - Question 10

Detention time for a circular tank is given by

Detailed Solution for Test: Design Elements Of Sedimentation - Question 10

Explanation: Detention time for a circular tank is given by t = D2 (0.01D + 0.785H) /Q where D is the diameter of the tank, H is the vertical depth of wall and Q is the discharge rate.

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