GATE CE 2017 Paper 2 — page 18

Questions 52–54 of 65. Imported answers require review unless explicitly marked reviewed.

A municipal corporation is required to treat 1000 m

/day of water. It is found that an overflow rate of 20 m/day will produce a satisfactory removal of the discrete suspended particles at a depth of 3 m. The diameter (in meters, rounded to the nearest integer) of a circular settling tank designed for the removal of these particles would be

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The analysis of a water sample produces the following results:

Ion	milligram per milli-equivalent for the ion	Concentration (mg/L)
Ca	20.0	60
Mg	12.2	36.6
Na	23.0	92
K	39.1	78.2
Cl	35.5	71
SO	48.0	72
HCO	61.0	122

The total hardness (in mg/L as CaCO

) of the water sample is

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The radii of relative stiffness of the rigid pavements P and Q are denoted by

and

, respectively. The geometric and material properties of the concrete slab and underlying soil are given below:

Pavement	Thickness of Slab	Subgrade Reaction Modulus
	Concrete	Soil
P
Q

The ratio (up to one decimal place) of

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2017 · Paper 2

Question 52

Question 53

Question 54