Sewage Treatment Plant objective questions and answers

41. Self-cleansing velocity is

   A.Velocity at dry weather flow

   B.Velocity of water at flushing

   C.Velocity at which no accumulation remains in the drains

   D.Velocity of water in a pressure filter

42. In ISI units the power of sound is represented in

   A.Kgs

   B.Joules

   C.Newtons

   D.Watts

43. pH value of sludge during alkaline regression stage, is

   A.More than 7

   B.Less than 7

   C.Less than 6

   D.More than 6

44. The first stage of neutral process of sludge digestion, is

   A.Acid fermentation

   B.Acid regression

   C.Alkaline fermenttion

   D.None of these

45. In a sludge tank, the gas mainly produced, is

   A.Oxygen

   B.Nitrogen

   C.Hydrogen

   D.Carbon dioxide

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