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Test: Dual Media And Mixed Media Filter - Civil Engineering (CE) MCQ


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10 Questions MCQ Test Environmental Engineering - Test: Dual Media And Mixed Media Filter

Test: Dual Media And Mixed Media Filter for Civil Engineering (CE) 2024 is part of Environmental Engineering preparation. The Test: Dual Media And Mixed Media Filter questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Dual Media And Mixed Media Filter MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Dual Media And Mixed Media Filter below.
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Test: Dual Media And Mixed Media Filter - Question 1

What is the specific gravity of Anthracite used in a dual media filter?

Detailed Solution for Test: Dual Media And Mixed Media Filter - Question 1

Explanation: The specific gravity of Anthracite is 1.4 and due to this, the beds of it can be expanded at a same backwash rate as sand bed when the size of anthracite grains is twice of sand grains.

Test: Dual Media And Mixed Media Filter - Question 2

 In which of the following filter, two layers filtering media is provided for filtration?

Detailed Solution for Test: Dual Media And Mixed Media Filter - Question 2

Explanation: In dual media filter, filtration takes place from coarse to fine media by the provision of two layers filtering media called as dual media and that is why it is called as a dual media filter.

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Test: Dual Media And Mixed Media Filter - Question 3

 What is the size of sand used in a dual media filter?

Detailed Solution for Test: Dual Media And Mixed Media Filter - Question 3

Explanation: The size of sand used in a dual media filter is 0.5-1mm and it has a thickness of 20 to 30 cm.

Test: Dual Media And Mixed Media Filter - Question 4

 The coarser layer used in a dual media filter is of

Detailed Solution for Test: Dual Media And Mixed Media Filter - Question 4

Explanation: Anthracite is a coarser filter medium used in the dual media filter. It is costlier than sand and it is used as a substitute for sand.

Test: Dual Media And Mixed Media Filter - Question 5

The thickness of Anthracite used in dual media filter is

Detailed Solution for Test: Dual Media And Mixed Media Filter - Question 5

Explanation: Anthracite is used as a top layer in dual media filter having a thickness of 30-40cm.

Test: Dual Media And Mixed Media Filter - Question 6

 How the performance of rapid sand filter can be improved?

Detailed Solution for Test: Dual Media And Mixed Media Filter - Question 6

Explanation: The performance of rapid sand filter can be improved by capping sand filters with coal where the top 15 cm layer of sand is replaced with Anthracite.

Test: Dual Media And Mixed Media Filter - Question 7

The size of Anthracite used in dual media filter is

Detailed Solution for Test: Dual Media And Mixed Media Filter - Question 7

Explanation: The size of Anthracite used in dual media filter is 1.25-2.5mm and it is placed over a sand of 0.5 to 1mm size.

Test: Dual Media And Mixed Media Filter - Question 8

 In mixed media filter, the filtration is done from ______

Detailed Solution for Test: Dual Media And Mixed Media Filter - Question 8

Explanation: In mixed media filter, the filtration is from coarse to fine and impurities and suspended matter are stored and removed throughout the full depth of the bed.

Test: Dual Media And Mixed Media Filter - Question 9

What is the ratio in which coal, sand and garnet are present in the mixed media filter?

Detailed Solution for Test: Dual Media And Mixed Media Filter - Question 9

Explanation: In mixed media filter, the coal is placed on top, sand in the middle and garnet at the bottom in the proportion of 60%, 30%, 10% respectively.

Test: Dual Media And Mixed Media Filter - Question 10

 Which of the following order is correct regarding the specific gravity of the materials used in the mixed media filter?

Detailed Solution for Test: Dual Media And Mixed Media Filter - Question 10

Explanation: Anthracite coal has a specific gravity of 1.42, sand has a specific gravity of 2.65 and Garnet sand has a specific gravity of 4.2. So, coal has lower, sand has medium and Garnet sand has the highest specific gravity between them.

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