UPSC Civil Service Exam Questions - Engineering

Q1:

Which of the following are claimed as advantageous in respect of aerobic sludge digestion as compared to anaerobic sludge digestion ?
1. Lower BOD concentration in supernatant liquor.
2. Production of a sludge with excellent dewatering propensity.
3. Greater production of methane.
4. Lesser operating cost.
5. Lesser capital cost.
Select the correct answer using the codes given below :

A 1, 2 and 4

B 2, 3, 4 and 5

C 3, 4 and 5

D 1, 2 and 5

ANS:D - 1, 2 and 5

No answer description is available.