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Agricultural Engineering Gate 2020 Questions with Answer
Ques 27 GATE 2020
A cold storage takes 5 hours to bring down the temperature of 100 metric tons of potato from 35 °C to 8 °C. The specific heat capacity of potato is 3.1 kJ kg-1 °C-1. The coefficient of performance (COP) and the latent heat of vapourisation of the refrigerant (R-22) at an evaporation temperature of -10 °C are 3.66 and 230 kJ kg-1, respectively. Neglecting respiration heat load of potato, and assuming no power loss, the values of refrigerant flow rate and the power input to the compressor are
Ques 28 GATE 2020
Hydrothermal treatment of paddy makes
Ques 29 GATE 2020
Both particle formation and drying process are carried out by
Ques 30 GATE 2020
Fresh tomato juice containing 6% (w/w) total solids enters in a single effect evaporator at a feed rate of 500 kg h-1 to concentrate up to 36% (w/w) solids. In this process, the rate of water removal in kg h-1 (round off to 1 decimal place) is _______.
417.0 is the correct answer.
Ques 31 GATE 2020
Heat gain is occurring through a composite cold storage wall, made of brick and polyurethane foam insulation (thickness and thermal conductivity values are given below). If the exposed surfaces of brick and insulation are at 45 °C and 10 °C, respectively, the temperature at the interface of brick and insulation in °C (round off to 1 decimal place) is _______.
41.5 is the correct answer.
Ques 32 GATE 2020
A milk processing plant pasteurizes a batch of 12500 L whole milk to inactivate the pathogen Coxiella burnetii, (decimal reduction time of 14 seconds at 72 °C) prior to packing in 500 milliliter pouches. The initial count of the noted organism is 10 per milliliter. For this batch pasteurization process at 72 °C, resulting in no survivor in any of the packages, the process F-value in seconds is _______.
126 is the correct answer.
Ques 33 GATE 2020
Choose the correct combination of process (Column I) performed by corresponding machine component(s) (Column II)
Column I
P. Paddy dehusking
Q. Wheat milling
R. Pulse dehusking
S. Spice grinding
Column II
1. Abrasive emery roll cylinder
2. Attrition disk
3. Break roll and reduction roll
4. Rubber rolls
Ques 34 GATE 2020
Saturated steam at 121 °C is used to sterilize pineapple juice by direct steam injection. The initial temperature of the juice is 80 °C and after sterilization, the blend of diluted juice exits the sterilizer at 95 °C. The enthalpy values of steam and condensate water are given in Table below. Specific heat capacity of the juice is 3.9 kJ kg−1 °C−1. Assuming no energy loss to the surroundings in the process of sterilization, the ratio of juice sterilized to steam utilized is ____________.
Ques 35 GATE 2020
Hot refined oil at 120 °C enters a concentric tube-in-tube heat exchanger (HE) at the rate of 20 kg min−1. The oil is cooled by water entering at a temperature of 30 °C from the other end of the HE at the rate of 50 kg min−1. Specific heat capacities of oil and water are 1.9 and 4.2 kJ kg−1 °C−1, respectively. The effectiveness of the HE may be taken as 0.7. Assuming no heat loss to the surrounding under steady-state condition, the exit temperature of water from the HE in °C is
Ques 36 GATE 2020
Air-water vapour mixture at 30 °C DBT and 40% RH is heated to 65 °C DBT and 30 °C WBT and is used as drying medium under the constant rate period drying of spinach leaves. Specific heat capacities of dry air and pure water vapour are 1.005 and 1.88 kJ kg-1 °C-1, respectively. Using the properties given in Table below, the value of absolute humidity in kg water vapour per kg dry air (round off to 3 decimal places) for the dryer exit air at DBT of 45 °C is_______.
0.018 is the correct answer.
Ques 37 GATE 2020
Tray type paddy separator is employed to separate paddy from a binary mixture of paddy and brown rice at a feed rate of 1200 kg h-1. Mass fractions of paddy in feed, separated paddy and brown rice streams are 0.2, 0.75 and 0.02, respectively. The amount of paddy in separated paddy stream in kg h1 (round off to 2 decimal places) is _______.
222.00 is the correct answer.
Ques 38 GATE 2020
A cylindrical silo with 3.0 m diameter and height to diameter ratio of 5:1 is filled with 60 metric ton wheat grains having bulk density of 725 kg m3. The coefficient of friction between grain and silo wall is 0.42 and the ratio of lateral pressure to vertical pressure is 0.5. The vertical pressure at the bottom of silo in kPa (round off to 2 decimal places) is
[use 1 kgf = 9.81 N]
_______.
52.00 is the correct answer.
Ques 39 GATE 2020
The untimely loss of life is a cause of serious global concern as thousands of people get killed ________ accidents every year while many other die ________ diseases like cardio vascular disease, cancer, etc.
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