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Environmental Engineering: Nuclear Quiz 3

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Question 1

A vertical cut is to be made in a saturated clay with C = 18 KN/m2, Φ = 00 and γ = 16 KN/m3. What is the theoretical depth to which the clay can be excavated without side collapse?

Question 2

A saturated stiff clay has unit weight 2 gm/cm3 and unconfined compressive strength 2 kg/cm2. The depth of tension crack that would develop in this clay is_______.(Ka = 1)

Question 3

If the concentration of Na+, Ca++ and Mg++ in a water sample are 345,60 and 18 mg/l respectively, then the Sodium Absorption Ratio (SAR) of this water will be ________.

Question 4

If the BOD5, 20 of waste is 125 mg/L and the reaction rate constant (to the base ‘e’) at 20 °C is 0.325/day, then the ultimate BOD is ______ mg/L.

Question 5

A reactor has an inflow of sewage 180 liters/min. The influent COD is 1000 mg/l and the effluent COD is 250 mg/l. The waste water contains 50% of biodegradable waste. The volume of methane gas produced per day is _____ m3.

Question 6

At a water treatment plant, 15 million litres of water is treated daily, using alum dosage of 18 mg per litre. The amount of carbon dioxide released _____ kg.

Question 7

Available chlorine in bleaching powder solution is 0.6 mg/ml. To obtain a chlorine dose of 0.1 mg/lit in a 200 ml water sample, the amount of bleaching powder solution to be added

Question 8

Consider the following statements:
1) The alkalinity of the fresh water is alkaline but as time passes it becomes acidic.
2) The fresh domestic waste water is dark in colour but as time passes it becomes grey.

Question 9

Which of the following statement(s) is (are) CORRECT?
1. Underground waters are generally softer than the surface waters.
2. For drinking purpose, water with hardness below 75 ppm are generally tasteless, and hence, the prescribed hardness limit for public supplies range between 75 to 115 ppm.
3. One degree of hardness means the soap destroying power produced by 14.25 milligrams of calcium carbonate in one litre of water.

Question 10

Two primary settling basins of 45 m in diameter with single effluent weirs located on the peripheries of the tank. For a water flow of 40,000 m3/d, the weir loading per day (in m3/m day ) is
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