While designing a blower for backwash for sand filters with air scouri – McqOptions

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1.	While designing a blower for backwash for sand filters with air scouring what is the velocity considered?
A.	t36 m/h
B.	t30 m/h
C.	t24 m/h
D.	t20 m/h
Answer» D. t20 m/h

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