1
GATE CE 2024 Set 2
Numerical
+2
-0.833

A circular settling tank is to be designed for primary treatment of sewage at a flow rate of 10 million liters/day. Assume a detention period of 2.0 hours and surface loading rate of 40000 liters/m2/day. The height (in meters) of the water column in the tank is ______________ (rounded off to 2 decimal places).

Your input ____
2
GATE CE 2024 Set 2
Numerical
+2
-0.833

An organic waste is represented as C240O200H180N5S5.

(Atomic weights: S-32, H-1, C-12, O-16, N-14).

Assume complete conversion of S to SO2 while burning.

SO2 generated (in grams) per kg of this waste is __________ (rounded off to 1 decimal place).

Your input ____
3
GATE CE 2024 Set 1
MCQ (Single Correct Answer)
+2
-0.833

For assessing the compliance with the emissions standards of incineration plants, a correction needs to be applied to the measured concentrations of air pollutants. The emission standard (based on 11% Oxygen) for HCl is 50 mg/Nm3 and the measured concentrations of HCl and Oxygen in flue gas are 42 mg/Nm3 and 13%, respectively.

Assuming 21% Oxygen in air, the CORRECT statement is:

A

No compliance, as the corrected HCl emission is greater than the emission standard.

B

Compliance is there, as the corrected HCl emission is less than the emission standard.

C

Compliance is there, as there is no need to apply the correction since Oxygen is greater than 11% and HCl emission is lesser than the emission standard.

D

No compliance, as the Oxygen is greater than 11% in the flue gas.

4
GATE CE 2014 Set 1
Fill in the Blanks
+2
-0
A straight 100 m long raw water gravity main is to carry water from an intake structure to the jack well of a water treatment plant. The required flow through this water main is 0.21 $$m^3/s$$. Allowable velocity through the main is 0.75 m/s. Assume f = 0.01, g = 9.81 $$m/s^2$$. The minimum gradient (in cm/100m length) to be given to this gravity main so that the required amount of water flows without any difficulty is _____.
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