GATE XE 2020 Paper 1 — page 51

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

A hammer mill, operating at a feed rate of 108 ton h⁻¹, consumes 10 kW power for reducing size of wheat grain from 3.2 mm to 1.25 mm. If Bond’s law holds good, the feed rate (round off to 2 decimal places) for reducing the size of the wheat grain to 0.75 mm at the same power consumption level is ______ ton h⁻¹.

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During spray drying of a milk sample, inlet and outlet temperatures are maintained at 132 °C and 80 °C, respectively. If the ambient temperature is 29 °C, the thermal efficiency (round off to 2 decimal places) of the dryer will be ______ %.

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An orange juice flowing at 0.80 kg s⁻¹ enters a counter current double pipe heat exchanger at 20 °C and leaves at 72 °C. Inlet and outlet temperatures of the hot water used as heating medium in the exchanger are 81 °C and 74 °C, respectively. The specific heat of the orange juice is 3.74 kJ kg⁻¹ K⁻¹ and overall heat transfer coefficient is 492 W m⁻² K⁻¹. The heat transfer surface area (round off to 2 decimal places) will be ______ m².

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2020 · Paper 1

Question 20

Question 21

Question 22