GATE XE 2023 Paper 1 — page 51

Questions 151–153 of 175. Imported answers require review unless explicitly marked reviewed.

If D₁₀ for Salmonella in egg yolk is 0.75 kGy, calculate the radiation dose in kGy (rounded off to 2 decimal places) required for reducing the Salmonella count in egg yolk by 8 log cycles.

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The average moisture binding energy of a plant protein based snack at 8% moisture content (dry basis) is 3200 cal.mol⁻¹. If the water activity of the snack at the above moisture content is 0.30 at 30 °C, the water activity of the same at 45 °C is __________ (rounded off to 2 decimal places). The value of Gas constant R = 1.987 cal.mol⁻¹.K⁻¹.

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Cow milk is pasteurized at a flow rate of 1 kg.s⁻¹ in a counter-current heat exchanger using hot water as the heating medium. The milk enters the heat exchanger at 15 °C and exits at 50 °C. The specific heat of cow milk is 3.5 kJ.kg⁻¹.°C⁻¹ and remains constant at the inlet and exit of the heat exchanger. The inlet and exit temperatures of the hot water are 75 °C and 60 °C respectively. If the overall heat transfer coefficient is 1800 W.m⁻².°C⁻¹, the heat transfer surface area in m² is _____ (rounded off to 2 decimal places). Assume steady state conditions.

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2023 · Paper 1

Question 151

Question 152

Question 153