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GATE (CE) 2022: Environment Engineering #50

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Question 1

Two wells are fully penetrating in a confined aquifer at two different locations. The ratio of permeability and thickness of the two wells in aquifer are 5 and 10, respectively. The transmissivity ratio of these two wells is ________.

Question 2

A 250 ml sample of water has an initial pH or 10. A volume of 12.25 ml if 0.02 N H₂SO₄ is required to titrate the sample to pH 4.5. What is the total alkalinity of the water in milligrams per litre as CaCO₃?

Question 3

Match List I with List II and select the correct codes

Question 4

Which of the following statements are CORRECT?
1). Turbidity rod with platinum needle is inserted inside the water and the depth at which platinum needle just become invisible gives turbidity in ppm.
2). Jackson turbidimeter is based on scattering principle.
3). In Baylis turbidimeter, the light intensity is measured in the direction of incident light only where as in Nephelometer, the light intensity is measured at right angles to the incident ray.

Question 5

Read the following statements carefully:
Statement I: The D.O. value increases with increase in pressure and reduces with increase of chloride content.
Statement II: The presence of D.O. in water is necessary to keep it fresh but much higher value of D.O. is also not desirable.
Select the correct option:

Question 6

A water treatment plant is required to process 34570 m³/d of raw water (density = 1000 kg/m³, kinematic viscosity = 10^-6 m²/s). The rapid mixing tank imparts a velocity gradient of 1000s^-1 to blend 45 mg/L of alum with the flow for detention time of 2.5 minutes. The power input (in kW) required for rapid mixing is

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ESE & GATE CE Environmental Engineering

Jun 25ESE & GATE CE