Environmental Engineering Mock Test 8

10%

Question 1 of 10

1. The maximum BOD removal efficiency of the Step aeration process of the activated sludge system is ___________

99%

80%

78%

92%

Question 1 of 10

Question 2 of 10

2. The filter material used in contact bed is ___________

Fine sand

Stone ballast

Gravel

Sand

Question 2 of 10

Question 3 of 10

3. How many stages are there in the sludge digestion process?

Question 3 of 10

Question 4 of 10

4. The design pressure of ____ is applied on pressure type flotation device.

2kg/cm²

1kg/cm²

3kg/cm²

6kg/cm²

Question 4 of 10

Question 5 of 10

5. The effective area of the diffuser plate used in the aeration tank is ___________

1160cm²

800cm²

780cm²

400cm²

Question 5 of 10

Question 6 of 10

6. 7% of solids concentration of thickened sludge is obtained from gravity thickener. What is the type of sludge?

Tertiary sludge

Primary sludge

Secondary sludge

Activated sludge

Question 6 of 10

Question 7 of 10

7. Which of the following sludge process has maximum aeration period?

Extended process

Tapered aeration

Step aeration process

Conventional process

Question 7 of 10

Question 8 of 10

8. The minimum size of sludge digestion tank is ___________

0.5m

Question 8 of 10

Question 9 of 10

9. The minimum weir loading rate of primary clarifier is ____m³/m/day.

50000

20000

125000

10000

Question 9 of 10

Question 10 of 10

10. The design value of food to microorganism ratio in the tapered aeration sludge process is ___________

0.4

0.8

0.1

0.2

Question 10 of 10