Civil Engineering
2023 · Paper 1
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Complete GATE CE 2023 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 64–65 of 65. Imported answers require review unless explicitly marked reviewed.
Question 64
Open questionCENAT2 marksNeeds review
The wastewater inflow to an activated sludge plant is 0.5 m³/s, and the plant is to be operated with a food to microorganism ratio of 0.2 mg/mg-d. The concentration of influent biodegradable organic matter to the plant (after primary settling) is 150 mg/L, and the mixed liquor volatile suspended solids concentration to be maintained in the plant is 200 mg/L. Assuming that complete removal of biodegradable organic matter in the tank, the volume of aeration tank (in m³, in integer) required for the plant is ________________.
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Open questionCENAT2 marksNeeds review
Trigonometric levelling was carried out from two stations P and Q to find the reduced level (R. L.) of the top of hillock, as shown in the table. The distance between Stations P and Q is 55 m. Assume Stations P and Q, and the hillock are in the same vertical plane. The R. L. of the top of the hillock (in m) is ________________________ (round off to three decimal places).
Station | Vertical angle of the top of hillock | Staff reading on benchmark | R. L. of benchmark |
|---|---|---|---|
P | 18°45′ | 2.340 m | 100.000 m |
Q | 12°45′ | 1.660 m | |
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