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Civil Set-1
Environmental Engineering
137

Environmental Engineering MCQ with Answers

137) For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as

4.5 to 6.0

6.5 to 8.0

8.5 to 10.0

10.5 to 12.0

Answer is:

6.5 to 8.0

Environmental Engineering MCQ with Answers

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Related Environmental Engineering MCQ with Answers

138) Sludge volume index is defined as the ratio of

percentage of sludge by volume to percentage of suspended solids by weight

percentage of sludge by volume to percentage of total solids by weight

percentage of suspended solids by weight to percentage of sludge by volume

percentage of total solids by weight to percentage of sludge by volume

Answer is:

percentage of sludge by volume to percentage of suspended solids by weight

139) For normal sludge, the value of sludge index for Indian conditions is

0 to 50

50 to 150

150 to 350

350 to 500

Answer is:

150 to 350

140) When there is no recirculation of sewage, then recirculation factor is

0

1

infinity

none of the above

Answer is:

1

141) For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be

X/4

X/2

X

2X

Answer is:

X/2

Environmental Engineering MCQ with Answers

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