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CE Quiz 10

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Question 1

For a waste sample, the ultimate BOD at 20°C is found to be 250 mg/l. For the same waste, the ultimate BOD at 30°C will be

Question 2

If the BOD curve with time is drawn as concave upwards, then on decreasing the temperature the curve will shift

Question 3

Which one of the following sewage treatment units has a Parshall flume?

Question 4

Match List I with List II and select the correct codes

Question 5

In an activated sludge process, the sludge volume index can be controlled by

Question 6

The rate of food removal in attached growth system depends on many factors. These include
1. Wastewater flow rate
2. Organic loading rate
3. Rate of diffusivity of both oxygen and food into the biofilm.
4. Temperature

Question 7

Which of the statements are true?
1) The sludge from the PST is composed of 70% volatile and 30% fixed solids.
2) Only 35% of the volatile solids form the digested sludge.
3) Processes in the sludge digestion are fermentation and methane formation.
4) Methane formers are very responsive to shock loading.

Question 8

The type of settling in the secondary sedimentation tank of activated sludge process is

Question 9

Statement 1: Sewers are always designed as gravity conduits.

Statement 2: The sewer pipes are designed for maximum daily discharge.

Question 10

Statement 1: When the sewage is discharged into a river, it leads to decrease in dissolved oxygen content.

Statement 2: Bacteria present in river requires oxygen for decomposition of organic matter.

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AE & JE Exams

Aug 18AE & JE Exams