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Agricultural Engineering Gate 2021 Questions with Answer
Ques 53 GATE 2021
A pump, discharging water at a rate of 80 L s⁻¹, is used to irrigate 2 ha of land in 10 h. On irrigation, moisture content of the soil (on weight basis) in the root zone depth of 50 cm is increased from 18% to 30%. If bulk density of the soil is 1500 kg m⁻³, water application efficiency in per cent is [round off to 2 decimal places]
62.50 is the correct answer.
Ques 54 GATE 2021
Pumping test is carried out at a constant discharge of 5400 L min⁻¹ for 24 h in a main well of 30 cm diameter penetrated 25 m below the static water table. The water level in observation wells located at 30 m and 90 m away from the main well are lowered by 1.11 m and 0.53 m, respectively. Considering steady state flow condition, drawdown estimated in the main well in m is [round off to 2 decimal places] (Take π = 3.14)
4.13 is the correct answer.
Ques 55 GATE 2021
The shape of the Instantaneous Unit Hydrograph (IUH) of a catchment is an isosceles triangle with a peak of 60 m³ s⁻¹ and time to peak of 3 h. If the constant baseflow is 7.5 m³ s⁻¹, the peak of the 3 h Unit Hydrograph (UH) in m³ s⁻¹ is
Ques 56 GATE 2021
A horizontal axis lift type wind rotor of diameter 4 m is used to run a pump at a wind velocity of 15 km h⁻¹ at standard atmospheric pressure and temperature (density of air is 1.23 kg m⁻³). If velocity of wind leaving the rotor blade is reduced to one-third of the approaching wind velocity, the thrust acting on the blade of the wind rotor in N is [round off to 2 decimal places]
119.25 is the correct answer.
Ques 57 GATE 2021
A solar panel has length of 1.3 m and width of 0.65 m. The solar cells cover 90% of the panel area and its conversion efficiency is 13.7%. For a total solar radiation of 750 W m⁻², the panel output voltage is 18 V at its maximum power output. If two such panels are connected in series to supply power to run a thresher, the current in A that can be supplied by the two panels at the maximum power output is
Ques 58 GATE 2021
A small watershed receives rainfall of 90 mm in a day. For this watershed, irrespective of the land use, the amount of initial abstraction can be considered as 25% of the potential maximum retention (S) of soil. Initially, the entire watershed was under forest with S = 136 mm, which was converted into cultivated land with S = 64 mm. The change in the daily runoff volume due to this land use alteration for this specific rainfall event in percent is [round off to one decimal place]
143.3 is the correct answer.
Ques 59 GATE 2021
A windbreak, 15 m in height and 200 m in length, is established to protect the land from wind erosion in an arid area. The minimum wind velocity at the height of 15 m above the ground required to move the most erodible soil fraction is 9.6 m s⁻¹. If a year during period wind velocity at 15 m height is 16 m s⁻¹ and the wind direction deviates 40° from the line perpendicular to the windbreak, the area protected by the windbreak in ha is [round off to 2 decimal places]
2.85 is the correct answer.
Ques 60 GATE 2021
The approximate relationship between Sediment Delivery Ratio (SDR) and drainage area (A) shows that SDR varies
Ques 61 GATE 2021
Cohesionless soil is naturally deposited and makes a slope of infinite extent having slope angle of 25°. If the effective angle of internal friction of this soil is 30°, the factor of safety of slope is [round off to 2 decimal places]
1.23 is the correct answer.
Ques 62 GATE 2021
A shear annulus with inner and outer diameters of 240 mm and 300 mm, respectively is used to measure shear strength of soil in the field. When it is inserted into the soil and rotated, the torque measured at the soil failure is 50 N-m. Shear strength of the soil in kPa is (Take π = 3.14)
Ques 63 GATE 2021
It is proposed to develop bench terraces in an area having land slope of 10%. If the vertical interval between the bench terraces is 2.5 m and the batter slope is 100%, working width (in m) and the area lost for cultivation (in per cent), respectively will be
Ques 64 GATE 2021
The observed concentrations of magnesium (Mg²⁺), sodium (Na⁺), and bicarbonate (HCO₃) in saturated extract of a soil sample taken from the root zone are 5.68 meq L⁻¹, 9.90 meq L⁻¹, and 11.20 meq L⁻¹, respectively. If the concentration ratio of HCO₃/Ca²⁺ is 2.8, the sodium adsorption ratio is [round off to 2 decimal places]
4.50 is the correct answer.
Ques 65 GATE 2021
A sample of wet sandy-clay loam soil of mass 135 kg is collected for laboratory tests. The wet density, water content (weight basis) and specific gravity of solids of this soil sample are 1.8 g cm⁻³, 18%, and 2.7, respectively. The dry density (in g cm⁻³) and porosity (in per cent) of the soil sample, respectively, are
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