Sources and Coveyances Water · Environmental Engineering · GATE CE

Marks 1

What is the CORRECT match between the air pollutants and treatment techniques given in the table?

Air pollutants	Treatment techniques
P - NO₂	i - Flaring
Q - SO₂	ii - Cyclonic separator
R - CO	iii - Lime scrubbing
S - Particles	iv - NH₃ injection

GATE CE 2024 Set 2

Which one of the following products is NOT obtained in anaerobic decomposition of glucose?

GATE CE 2024 Set 2

The primary air pollutant(s) is/are

GATE CE 2024 Set 1

Marks 2

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).

GATE CE 2024 Set 2

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).

GATE CE 2024 Set 2

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:

GATE CE 2024 Set 1

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 _____.

GATE CE 2014 Set 1