GATE CE year:2020 PYQs & Answers — Page 7

Questions 61–70 of 130. Imported answers require independent review unless marked reviewed.

Topic practice 130 questionsPage 7 of 13

A road in a hilly terrain is to be laid at a gradient of 4.5%. A horizontal curve of radius 100 m is laid at a location on this road. Gradient needs to be eased due to combination of curved horizontal and vertical profiles of the road. As per IRC, the compensated gradient (in %, round off to one decimal place), is ________.

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24-h traffic count at a road section was observed to be 1000 vehicles on a Tuesday in the month of July. If daily adjustment factor for Tuesday is 1.121 and monthly adjustment factor for July is 0.913, the Annual Average Daily Traffic (in veh/day, round off to the nearest integer) is ________.

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In a drained triaxial compression test, a sample of sand fails at deviator stress of 150 kPa under confining pressure of 50 kPa. The angle of internal friction (in degree, round off to the nearest integer) of the sample, is ________.

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A soil has dry unit weight of 15.5 kN/m

, specific gravity of 2.65 and degree of saturation of 72%. Considering the unit weight of water as 10 kN/m

, the water content of the soil (in %, round off to two decimal places) is ____________.

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A fully submerged infinite sand slope has an inclination of 30° with the horizontal. The saturated unit weight and effective angle of internal friction of sand are 18 kN/m³ and 38°, respectively. The unit weight of water is 10 kN/m³. Assume that the seepage is parallel to the slope. Against shear failure of the slope, the factor of safety (round off to two decimal places) is ________.

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A one-dimensional consolidation test is carried out on a standard 19 mm thick clay sample. The oedometer’s deflection gauge indicates a reading of 2.1 mm, just before removal of the load, without allowing any swelling. The void ratio is 0.62 at this stage. The initial void ratio (round off to two decimal places) of the standard specimen is ____________.

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A 4 m wide rectangular channel carries 6 m³/s of water. The Manning’s ‘n’ of the open channel is 0.02. Considering g = 9.81 m/s², the critical velocity of flow (in m/s, round off to two decimal places) in the channel is ________.

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Velocity distribution in a boundary layer is given by

, where

is the velocity at vertical coordinate

is the free stream velocity and

is the boundary layer thickness. The values of

and

are 0.3 m/s and 1.0 m, respectively. The velocity gradient

(in s

, round off to two decimal places) at

, is ____________.

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A river has a flow of 1000 million litres per day (MLD), BOD₅ of 5 mg/litre and Dissolved Oxygen (DO) level of 8 mg/litre before receiving the wastewater discharge at a location. For the existing environmental conditions, the saturation DO level is 10 mg/litre in the river. Wastewater discharge of 100 MLD with the BOD₅ of 200 mg/litre and DO level of 2 mg/litre falls at that location. Assuming complete mixing of wastewater and river water, the immediate DO deficit (in mg/litre, round off to two decimal places), is ________.

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Two identically sized primary settling tanks receive water for Type-I settling (discrete particles in dilute suspension) under laminar flow conditions. The Surface Overflow Rate (SOR) maintained in the two tanks are 30 m

.d and 15 m

.d. The lowest diameters of the particles, which shall be settled out completely under SORs of 30 m

.d and 15 m

.d are designated as

and

, respectively. The ratio

(round off to two decimal places) is ____________.

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GATE CE year:2020 PYQs

Question 21

Question 21

Question 22

Question 22

Question 23

Question 23

Question 24

Question 24

Question 25

Question 25