GATE XE topic:food-engineering PYQs & Answers — Page 4

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Questions 31–40 of 60. Imported answers require independent review unless marked reviewed.

Topic practice 60 questionsPage 4 of 6

Which of the following combinations of analytical equipment, property measured and food property are correct?

Your answerSelect all correct options. You can choose more than one.

Particle size analyzer - particle size distribution - span value

Texture profile analyzer - morphology - chewiness

Differential scanning calorimeter - glass transition temperature - degree of cakeing

Capillary viscometer - viscosity - sensory

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Choose the correct pair(s) of Governing Law and corresponding application(s)

Your answerSelect all correct options. You can choose more than one.

Hagen Poiseuille law - Pressure drop

Rittinger’s law - Vapor pressure

Stefan Boltzmann law - Radiation heat transfer

Raoult’s law - Size reduction

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An orange juice sample is concentrated from 10% to 40% (by weight) total soluble solids in a single effect evaporator with a feed rate of 3600 kg hr−1 at 25°C. The evaporator operates at sufficient vacuum to allow the product moisture to evaporate at 55°C. The specific heat of both feed and concentrated juice is 4.0 kJ kg−1 °C−1. If enthalpy of water vapour at 55°C is 2600 kJ kg−1, heat transfer rate through the heating surface area of the evaporator in kilowatt (in integer) will be _____.

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Dry air is fed into a tray dryer. The percentage relative humidity of the air leaving the dryer is 60% at 70°C and 101.35 kPa. If, saturated vapour pressure of water at 70°C is 31.2 kPa, humidity of the air leaving the dryer in kg water per kg dry air (round off to 3 decimal places) will be _____. (Given: Molecular weight of water and air are 18.02 g mol−1 and 28.97 g mol−1 respectively)

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In a cold storage plant, 5000 kg potato having a constant specific heat capacity of 3.65 kJ kg−1 °C−1 are cooled from 28 °C to 2 °C in 24 hours. The heat of respiration of potato per 24 hours is 3.12 kJ kg−1 during the storage. Assuming the efficiency of the storage plant to be 70%, the capacity of the plant in ton of refrigeration (round off to 2 decimal places) is _____. (Given: 1 ton of refrigeration = 3.517 kilowatt)

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The velocity of 2.2 μm diameter fat particles inside a centrifuge, running at 600 rpm and 20 °C, is 0.25 mm s⁻¹. The velocity of 1.5 μm diameter fat particles inside the same centrifuge running at 750 rpm and same temperature (round off to 2 decimal places) will be _____ mm s⁻¹.

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The whole milk at 22 °C is pumped through a stainless steel pipe at a flow rate of 3 L s⁻¹. The length and inner diameter of the pipe are 40 m and 4 cm, respectively. If viscosity and density of the milk at the pumping temperature of 0.2 Pa s and 1032 kg m⁻³, respectively, the Reynolds number (rounded off to nearest integer) will be ______.

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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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GATE XE topic:food-engineering PYQs

Question 18

Question 19

Question 20

Question 21

Question 22

Question 8

Question 19

Question 20

Question 21

Question 22