GATE 2017-2018 :: GATE Agricultural
- A 200 mm well fully penetrates a confined aquifer. After a long period of pumping at a rate of 1400 litres per minute, the drawdowns in the observation wells located at 25 m and 40 m from the pumping well are found to be 2.6 m and 1.9 m, respectively. The transmissivity of the aquifer in m2 day-1 is
- It is proposed to construct bench terraces on a 10% hill slope. If the batter slope is ½ H : 1 V, the percentage area that will be lost for cultivation due to bench terracing is
- Air at 700C and 0.015 humidity ratio is cooled adiabatically by spraying water. The final temperature of the air is 550C. Specific heat capacities of dry air and water vapour are 1.005 and 1.88 kJ kg-1 K-1, respectively and latent heat of vapourization of water at 00C is 2501.7 kJ kg-1. The absolute humidity of the outlet air, in kg water vapour per kg dry air is
- A single effect vacuum evaporator has 100 tubes of 25 mm diameter. One thousand kg feed of milk per hour with 15% TS is concentrated to 20% TS in the evaporator. Film heat transfer coefficients on either sides of the tube are 5000 and 800 W m2 K-1. Thermal conductivity of 1.5 mm thick SS tubes is 15 W m-1 K-1. Latent heat of vapourization under vacuum is 2309 kJ kg-1. For 100C temperature difference across the tube wall, the height of each tube, in m is
- One thousand units of mixed fruit bar, each weighing 100 g with a surface area of 0.01 m2, are frozen from 700C molten mass condition to -200C frozen storage condition within 3 hours. The specific heat capacity values of the bar are 3.6 kJ kg-1 K-1 and 1.97 kJ kg-1 K-1 before and after freezing point (0 °C) respectively. If the latent heat of crystallization is 250 kJ kg-1, the cooling capacity of the refrigeration unit required in tons of refrigeration is
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A diesel engine running in dual fuel mode with diesel as pilot fuel and producer gas as primary fuel produces 3.5 kW at rated engine speed and is coupled directly to a generator for producing electricity. The amount of diesel and producer gas consumed per hour is 460 ml and 12.5 m3, respectively. Assuming calorific value of diesel and producer gas as 35280 and 3.97 MJ m-3, respectively, the brake thermal efficiency of the engine in percentage is
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A diesel engine running in dual fuel mode with diesel as pilot fuel and producer gas as primary fuel produces 3.5 kW at rated engine speed and is coupled directly to a generator for producing electricity. The amount of diesel and producer gas consumed per hour is 460 ml and 12.5 m3, respectively. If generator efficiency is 90%, the maximum electricity produced, in kW is
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The hourly discharge observations at the mouth of a watershed due to 2 cm excess rainfall during 0 to 1 h and 3 cm excess rainfall during 1 to 2 h are given in the table below. Assume a constant base flow of 1 m3 s-1.
The area of the watershed, in km2 is -
The hourly discharge observations at the mouth of a watershed due to 2 cm excess rainfall during 0 to 1 h and 3 cm excess rainfall during 1 to 2 h are given in the table below. Assume a constant base flow of 1 m3 s-1.
The peak of 1 h unit hydrograph in m3 s-1 for the watershed and its time of occurrence in h, respectively are -
Soybean is to be planted with a precision planter that meters 54 seeds per revolution of the metering disc powered from a ground wheel of diameter 490 mm. The desired plant population is 44800 per ha with a row to row spacing of 0.75 m. The germination percentage is 84. The planter is to be operated at 2.5 km h-1 with a 10% skid of ground wheel.The angular speed of ground wheel in rpm is
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