GATE CE branch:ce PYQs & Answers — Page 128 — Exam Papers

Questions 1271–1280 of 1300. Imported answers require independent review unless marked reviewed.

Topic practice 1300 questionsPage 128 of 130

An effective rainfall of 2-hour duration produced a flood hydrograph peak of 200 m³/s. The flood hydrograph has a base flow of 20 m³/s. If the spatial average rainfall in the watershed for the duration of storm is 2 cm and the average loss rate is 0.4 cm/hour, the peak of 2-hour unit hydrograph (in m³/s-cm, up to one decimal place) is ______.

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For a given water sample, the ratio between BOD

and the ultimate BOD is 0.68. The value of the reaction rate constant

(on base

) (in day

, up to two decimal places) is

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The equivalent sound power level (in dB) of the four sources with the noise levels of 60 dB, 69 dB, 70 dB and 79 dB is ______.

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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 spherical grit particles, having a radius of 0.01 mm and specific gravity of 3.0, need to be separated in a settling chamber. It is given that • g = 9.81 m/s² • the density of the liquid in the settling chamber = 1000 kg/m³ • the kinematic viscosity of the liquid in the settling chamber = 10⁻⁶ m²/s Assuming laminar conditions, the settling velocity (in mm/s, up to one decimal place) is ______.

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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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Two wastewater streams A and B, having an identical ultimate BOD are getting mixed to form the stream C. The temperature of the stream A is 20°C and the temperature of the stream C is 10°C. It is given that • the 5-day BOD of the stream A measured at 20°C = 50 mg/l • BOD rate constant (base 10) at 20°C = 0.115 per day • temperature coefficient = 1.135 The 5-day BOD (in mg/l, up to one decimal place) of the stream C, calculated at 10°C, 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	Length of Slab	Breadth of Slab	Thickness of Slab	Modulus of Elasticity	Poisson’s Ratio	Subgrade Reaction Modulus
			Concrete			Soil
P
Q

The ratio (up to one decimal place) of

is

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The wastewater having an organic concentration of 54 mg/l is flowing at a steady rate of 0.8 m³/day through a detention tank of dimensions 2 m × 4 m × 2 m. If the contents of the tank are well mixed and the decay constant is 0.1 per day, the outlet concentration (in mg/l, up to one decimal place) is ______.

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An observer standing on the deck of a ship just sees the top of a lighthouse. The top of the lighthouse is 40 m above the sea level and the height of the observer’s eye is 5 m above the sea level. The distance (in km, up to one decimal place) of the observer from the lighthouse is

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