GATE (CE) 2022: Environment Engineering

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Question 1

Which one of the following statement is FALSE about Jackson Turbiditimeters?

• AThe lowest turbidity value that can be measured on this instrument is 25
• BA Jackson turbiditimeter is also called a Jackson’s candle turbiditimeter
• CThe longer the light path, the lower the turbidity
• DHeight of column will be less for less turbid water and vice-versa

Question 2

A 180 cc of water sample drawn on to a empty dry crucible whose initial mass is found to be 98.636 gm. After oven drying at 103’C its final mass is 98.697gm. Then it is kept in a muffle furnace at 700’C for an hour. After cooling the mass of the sample in crucible is 98.654gm. The volatile solids present in the water sample (in mg/lit) is

Answer

Question 3

A water treatment plant is to treat 50 MLD by international standards. The amount (in kg) of bleaching powder (having 64% impurity) needed per day, if the chlorine demand of the water is 2 mg/l, will be ______ kg.

• A273.44
• B277.78
• C283.91
• D286.11

Question 4

Match List-I (Treatment method) with List-II (Important design parameter) and select the correct answer using the codes given below the lists:

• A4,- 1,- 3,- 2
• B4,- 3,- 1,- 2
• C1,- 2,- 3,- 4
• D1,- 3,- 2,- 4

Question 5

If the intensity of sound source is decreased 16 times to its earlier intensity, then the intensity level of source will be decreased by _____ dB.

Answer

Question 6

A rectangular sedimentation tank is designed for a surface overflow rate (surface overloading) of 400 litre/hour/m². The percentage of the suspended particles of diameter 0.01 mm that will be removed in the tank is ___________.
[Take kinematic viscosity of water = 1 mm²/sec and specific gravity of particle = 2.65]

Answer

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