“Loss of Head” is:
Correct Answer: Increased resistance to filtration in a sand filter (related to filtration capacity)
Description: RAPID SAND OR MECHANICAL FILTERS
Filtration removes the remaining alum not removed by sedimentation. As filtration proceeds, the suspended impurities and bacteria clog the filters resulting in their reduced efficiency called "loss of head”.
Backwashing
Rapid sand filters need frequent washing daily or weekly, depending upon the loss of head. Washing is accomplished by reversing the flow of water through the sand bed, which is called "backwashing". It helps in dislodging the impurities and cleaning up the sand bed.
Essentials of preventive and community dentistry
Soben Peter
5th edition
Category:
Dental
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now