GATE Dairy and Food Engineering: Preservation of Food – Previous Year Questions
15 GATE previous year questions on Preservation of Food (Dairy and Food Engineering, Agricultural Engineering) with answers and explanations, from every paper.
- GATE 2021 AG Q20 – The fishy flavour defect of butter is associated with decomposition of .
- GATE 2021 AG Q61 – For C. botulinum, reference process F₀=150 s and z=10°C. Can cold-spot temperatures are71.1°C during0–20 min,98.9°C during20–40 min, and 110°C…
- GATE 2022 AG Q35 – Milk contains 4×10⁵ C. botulinum spores/mL (D=1.2 min at 121.1°C) and 7×10⁶ L. monocytogenes spores/mL (D=.9 min at 121.1°C). At uniform121.1°C, find…
- GATE 2022 AG Q46 – Match I vitamin E; II calcium salts; III edible waxes; IV methyl bromide to P insect-killing fumigant; Q reduces shrinkage losses; R antioxidant with…
- GATE 2023 AG Q26 – Microbial death follows 10(N 0/N)=1+(t-t l)/D,where t is time,t l lag time and D decimal reduction time. Which statement is correct?
- GATE 2023 AG Q45 – Cheese packaging has LDPE1.5 mm and PET1.3 mm layers, area 6.25 cm²,and oxygen pressure difference.30 atm. Oxygen permeabilities are4.18×10⁻⁸ and…
- GATE 2023 AG Q64 – Carrot slices have water activity.89. Adding NaCl to 20% sucrose solution(initial activity.987) lowers solution activity to .85. Find added NaCl…
- GATE 2024 AG Q33 – Freeze100 kg shrimp from 25°C to−18°C. Freezing point is 0°C;specific heats above/below it are3.64 and 2.01 kJ/(kg·°C),and latent heat is 240 kJ/kg.…
- GATE 2024 AG Q44 – Thermophilic spores in milk have D₁₂₁=60 seconds and z=11°C. Find time at 141°C for a 10-log population reduction, in seconds.
- GATE 2024 AG Q65 – Fish fillets at−1°C are frozen in IQF air at−40°C. Characteristic dimension10 cm, density1200 kg/m³,printed conductivity2.5 W/(m²·K),convection…
- GATE 2025 AG Q24 – Which generally result from blanching fresh fruits and vegetables? Select all that apply.
- GATE 2025 AG Q41 – Which are NOT correct assumptions for deriving Plank’s food-freezing-time equation? Select all that apply.
- GATE 2025 AG Q63 – Cans contain .5 kg peas each and are processed at 121°C. One group starts with 5×10¹⁰ Clostridium spores/can;another with Bacillus spores. Desired…
- GATE 2026 AG Q42 – A reverse-Carnot refrigerator operates between −30°C and 20°C with refrigeration capacity 70 kW. Find the nearest condenser heat-rejection rate in kW.
- GATE 2026 AG Q47 – Milk can be pasteurized at 91°C for 3 s or at 73°C for 30 s to give the same sterilization value 10. Find the nearest thermal-death-time temperature…