Agricultural Engineering Gate 2018 Questions with Answer

Ques 27 GATE 2018

Which one of the following statements related to parboiling of paddy is NOT correct?

Ques 28 GATE 2018

In refining of the rice bran oil for edible purpose, neutralization process is carried out mainly to remove

Ques 29 GATE 2018

Which one of the following chemicals is NOT used for fumigation in either horizontal or vertical storage structures to kill insects?

Ques 30 GATE 2018

Match the following agricultural/food by-products in Column I with their respective value added products in Column II.

Ques 31 GATE 2018

Molecular diffusivity (D_AB) of water vapour in air is 2.6×10^-5 m² s^-1 over an effective distance of 3 mm. Density and coefficient of viscosity of air are 1.2 kg m^-3 and 2×10^-5 kg m^-1 s^-1, respectively. Sherwood Number (N_Sh) for water vapour in air is

Ques 32 GATE 2018

A cylindrical tank of 1.5 m diameter and 4 m height is filled with a liquid by a pipe of 2.5 cm internal diameter. The density and dynamic viscosity of the liquid are 1050 kg m^-3 and 1.6×10^-3 N s m^-2, respectively. If flow in the pipe is turbulent, the maximum time required to fill the tank is

Ques 33 GATE 2018

In a falling film evaporator, the inside and outside diameters of the tube wall are 25 mm and 27 mm, respectively. The tube is made of SS304 (thermal conductivity=15 W m^-1 K^-1) and the inside convective film coefficient is 750 W m^-2 K^-1. Outside the tube wall, film coefficient of condensing steam is 7175 W m^-2 K^-1. Based on the inside area of the tube, the overall heat transfer coefficient is

Ques 34 GATE 2018

Mass flow rate of outside air through a duct is 735 kg h^-1. Absolute humidity of air is 0.025 kg water vapour per kg dry air at 40°C. This air is mixed with equal quantity of moist exhaust air coming out of a counter current dryer at 55°C. The mixed air is heated up to 75°C to dry barley, fed at 174 kg h^-1, at an initial moisture content of 31% (wet basis) to a final value of 7% (dry basis). The absolute humidity of the exhaust air from the dryer in ‘kg water vapour per kg dry air’ will be

Ques 35 GATE 2018

One ton of marine fishery products are to be brought down from 32°C temperature to -18°C in half an hour time using a plate freezer. The freezing point of 85% water (based on total mass of the product) present in the fish is -0.3°C. Specific heat capacities of fresh and frozen fish solids (15% of total mass) are 3.2 and 1.8 kJ kg^-1 K^-1, respectively. Specific heat capacity of fresh water is 4.2 kJ kg^-1 K^-1 and that of ice is 2.2 kJ kg^-1 K^-1. Latent heat of crystallization of water is 335 kJ kg^-1. For freezing the products, the compressor power consumption with a vapour compression refrigeration cycle (coefficient of performance, 3.66) is

Ques 36 GATE 2018

Mycobacterium tuberculosis is having decimal reduction time of 13.5 s at 72°C. The count of the organism is to be reduced by eight logarithmic cycles in milk pasteurization with adequate holding at a temperature of 85°C. If Q₁₀ value for the organism is 7.5, the minimum holding time for the desired sterility of this particular organism at 85°C is

Ques 37 GATE 2018

A horizontal screw conveyor of length 3.2 m conveys solid grain having bulk density of 725 kg m^-3. The screw diameter, shaft diameter and pitch of the screw are 0.6 m, 0.24 m and 0.48 m, respectively. If the screw is operating with 80% of its volumetric capacity at a speed of 50 rpm, the actual discharge of the screw is

Ques 38 GATE 2018

In a feed milling plant, it has been observed that 80% of the feed passes through IS sieve 340 (3.25 mm opening) and 80% of the ground feed passes through IS sieve 40 (0.42 mm opening). The power requirement to crush the material with a feed rate of 3 ton h^-1 is 6 kW. Power requirement to crush 2 ton h^-1 of the same feed using the above system so that 80% of the ground feed pass through IS sieve 15 (opening 0.157 mm) is

Ques 39 GATE 2018

Solid food particles having nominal size of 0.2 mm with shape factor of 0.8 and density of 1040 kg m^-3 are to be fluidized using air at 28°C. The density and pressure of air at the above-mentioned condition are 1.175 kg m^-3 and 1.013×10⁵ Pa, respectively. The voidage at minimum fluidizing condition is 0.48. Use the value of ‘g’ as 9.81 m s^-2. If cross section of the empty bed is 0.5 m² and contains 520 kg of solids, the pressure drop at minimum fluidization condition is