1
GATE CE 2024 Set 1
MCQ (More than One Correct Answer)
+1
-0.33

The primary air pollutant(s) is/are

A

Sulphur dioxide

B

Lead

C

Ozone

D

Sulphuric acid

2
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.

3
GATE CE 2024 Set 1
Numerical
+2
-0.833

Activated carbon is used to remove a pollutant from wastewater in a mixed batch reactor, which follows first-order reaction kinetics.

At a reaction rate of 0.38 /day, the time (in days) required to remove the pollutant by 95% is _______________ (rounded off to 1 decimal place).

Your input ____
4
GATE CE 2024 Set 1
Numerical
+2
-0.833

A water treatment plant treats 25 MLD water with a natural alkalinity of 4.0 mg/L (as CaCO3). It is estimated that, during the coagulation of this water, 450 kg/day of calcium bicarbonate (Ca(HCO3)2) is required based on the alum dosage.

Consider the atomic weights as: Ca-40, H-1, C-12, O-16.

The quantity of pure quick lime, CaO (in kg) required for this process per day is _______ (rounded off to 2 decimal places).

Your input ____
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