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Test: Problems In Filter Operation - Civil Engineering (CE) MCQ


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10 Questions MCQ Test Environmental Engineering - Test: Problems In Filter Operation

Test: Problems In Filter Operation for Civil Engineering (CE) 2024 is part of Environmental Engineering preparation. The Test: Problems In Filter Operation questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Problems In Filter Operation MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Problems In Filter Operation below.
Solutions of Test: Problems In Filter Operation questions in English are available as part of our Environmental Engineering for Civil Engineering (CE) & Test: Problems In Filter Operation 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: Problems In Filter Operation | 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: Problems In Filter Operation - Question 1

The loss of head during cleaning operation of a rapid sand filter is

Detailed Solution for Test: Problems In Filter Operation - Question 1

Explanation: When cleaned bed is put into operation, the loss of head through it is 15-30cm and it goes on increasing as impurities are arrested in filter media.

Test: Problems In Filter Operation - Question 2

The thickness of the suspended matter on top of the sand bed is

Detailed Solution for Test: Problems In Filter Operation - Question 2

Explanation: As the thickness of suspended matter on top of the sand bed increases, the head loss is increased. So, it is directly proportional to head loss.

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Test: Problems In Filter Operation - Question 3

When the loss of the head exceeds the static head, the head becomes _____

Detailed Solution for Test: Problems In Filter Operation - Question 3

Explanation: The head becomes negative when the loss of the head through the bed depth exceeds the static head.The negative head is the fall of liquid level in the piezometric tube below the center line of under drainage system.

Test: Problems In Filter Operation - Question 4

What is the permissible negative head loss of a rapid sand filter?

Detailed Solution for Test: Problems In Filter Operation - Question 4

Explanation: The permissible negative head loss of a rapid sand filter is 0.8-1.2m. When the permissible limits are reached, the filter run is terminated and the filter is back washed.

Test: Problems In Filter Operation - Question 5

Which type of problem is caused in filter due to accumulation of solids on the top surface of filter media?

Detailed Solution for Test: Problems In Filter Operation - Question 5

Explanation: Clogging of bed is caused due to accumulation of solids on the top surface of filter media, which results in the formation of mud balls and cracking of the bed.

Test: Problems In Filter Operation - Question 6

______ are formed in filters due to insufficient washing of sand grains.

Detailed Solution for Test: Problems In Filter Operation - Question 6

Explanation: Mud balls are formed in filters due to insufficient washing of sand grains. Mud accumulates on the sand surface and form a dense mat.

Test: Problems In Filter Operation - Question 7

The cracking of bed is more prominent

Detailed Solution for Test: Problems In Filter Operation - Question 7

Explanation:The cracking of bed is more prominent near the wall junction which allows dirty matter to penetrate into filter media which decreases the efficiency of filtration.

Test: Problems In Filter Operation - Question 8

In which type of filtration problem, layers of gravel are displaced?

Detailed Solution for Test: Problems In Filter Operation - Question 8

Explanation: During Sand leakage, layers of gravel are displaced during back-washing. This can be minimized by proper proportioning of sand and gravel layers.

Test: Problems In Filter Operation - Question 9

The tendency of jetting can be minimized by

Detailed Solution for Test: Problems In Filter Operation - Question 9

Explanation: The tendency of jetting can be minimized by surface washing. It can also be minimized by the use of an 8cm layer of coarse garnet between fine media and gravel.

Test: Problems In Filter Operation - Question 10

 _______ type of trouble in filter is caused by the released of dissolved air and gases from water.

Detailed Solution for Test: Problems In Filter Operation - Question 10

Explanation: Air binding is caused by the released of dissolved air and gases from water to form bubbles which occupy void space of the filter media and the drainage system.

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