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BARC 2020: Environment Nuclear Quiz 1

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Question 1

Dechlorination of water is achieved by adding

Question 2

The pH of water admitted into a treatment plant was 5.0 in the morning. Due to raw water inflow, the pH changed to 7.0 in the next few hours. Considering a linear variation of the concentration of hydrogen with time, the time mean pH value of the water over this 24 hour is _______

Question 3

A ground water sample is tested for ion concentration as given below:

The total hardness and carbonate hardness in mg/l as Cao present in the above water sample are:

Question 4

Calculate the maximum hourly demand of a community whose population is 2 lakh and annual demand is 12×10⁶ KL.

Question 5

At a water treatment plant, 8 million litres of water is treated daily, using alum dosage of 20 mg per litres. The total quantity of alum used is ______ kg.

Question 6

A trickling filter plant treats 1500 cum per day of sewage with a BOD₅ of 220 mg/l and a suspended solid concentration of 250 mg/l. Estimate the total solid production assuming that primary clarification removes 30% of BOD and 60% of influent solids. Taking the solid production as a .5 Kg/kg of the applied BOD.

Question 7

Suppose 1000 ml graduated cylinder in the figure below contains a sludge of 2 percent solids. Now assume that all the solids are allowed to settle and that the liquid is decanted until the total volume is 500 ml. The new solid fraction is

Question 8

A septic tank in constructed in a building for serving 100 persons. The volume of the tank is 8 m³. If the tank is required to be cleaned when it is filled 62.5% of its capacity, then find the cleaning period of the tank in months. Assume rate of accumulation of sludge as 2.5 litres per capita per month.

Question 9

Find the percentage reduction in volume of the sludge when the moisture content of the sludge gets reduced to 88% from earlier 92%.

Question 10

An average operating data for conventional activated sludge treatment plant is as follows:
Influent BOD (So) = 200 mg/l
Effluent BOD(S) = 25 mg/l
MLSS(X) =3000 mg/l
Effluent suspended solids (Xe) = 40 mg/l
Waste sludge suspended solids (Xr) = 12000 mg/l
Wastewater flow (Q) = 50000 m³/day
Quantity of waste sludge (Qw) = 250 m³/day
Aeration period = 0.31 days
Find the sludge age in days

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ESE & GATE CE Environmental Engineering

Oct 4ESE & GATE CE