GATE XL Food Engineering PYQs & Answers — Page 4

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

The oxygen transmission rate through a 2.54 x 10⁻³ cm thick low density polyethylene film with air on one side and inert gas on the other side is 3.5 x 10⁻⁶ mL cm⁻² s⁻¹. Oxygen partial pressure difference across the film is 0.21 atm. The permeability coefficient of the film to oxygen is ______ x 10⁻¹¹ mL (STP) cm cm⁻² s⁻¹ (cm Hg)⁻¹.

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Ambient air at 30°C dry bulb temperature and 80% relative humidity was heated to a dry bulb temperature of 80°C in a heat exchanger by indirect heating. The amount of moisture gain (g kg⁻¹ dry air) during the process would be ______.

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Match the operation in Group I with the process in Group II

Group I P. Cleaning Q. Grading R. Size reduction S. Filtration

Group II

Quality separation

Clarification

Screening

Comminution

Your answerChoose one option.

P-1, Q-3, R-4, S-2

P-4, Q-1, R-3, S-2

P-2, Q-4, R-1, S-3

P-3, Q-1, R-4, S-2

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Identify an example of a classical diffusional mass transfer process with out involving heat, among the following.

Your answerChoose one option.

Drying of food grains

Carbonation of beverages

Distillation of alcohol

Concentration of fruit juice

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The rate of heat transfer per unit area from a metal plate is 1000 W m⁻². The surface temperature of the plate is 120°C and ambient temperature is 20°C. The convective heat transfer coefficient (W m⁻² °C⁻¹) using the Newton’s law of cooling will be ______.

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A 50% sucrose solution at 20 °C is flowing at a rate of 3.5 m³/h through a pipe with an inside diameter of 0.0475 m and length of 12 m. The viscosity and the density of the solution are 15.43 cp and 1232 kg/m³, respectively. The Reynolds number of the flow is ______.

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In a pineapple juice, fibre particles having mean diameter of 160 μm and density of 1075 kg/m³ are settling by gravity. If the density and viscosity of the juice are 1015 kg/m³ and 0.98 cp, respectively, terminal velocity of the fibre particles is ______ mm/s.

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Power consumption in liquid mixing is proportional to ______.

Your answerChoose one option.

Power number × liquid density × (rotational speed)³ × (impeller diameter)⁵

Power number × liquid density × (rotational speed)² × (impeller diameter)³

Liquid density × viscosity of the liquid × (rotational speed)² × (impeller diameter)³

Acceleration due to gravity × liquid density × (rotational speed)³ × (impeller diameter)⁵

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Water flowing at a rate of 1 kg/min is heated from 12 to 80 °C with flue gas supplied at a rate of 3 kg/min. The temperature and specific heat of the flue gas are 180 °C and 1.05 kJ/kg.K, respectively. If specific heat of water is 4.2 kJ/kg.K and the flow is parallel, then the logarithmic mean temperature difference will be ______ °C.

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In an evaporation process, a compressor picks up 0.05 m³ air in each revolution and compresses 500 kg of air per minute. If the specific volume of air is 0.9 m³/kg, then the compressor speed is _________ rpm.

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GATE XL Food Engineering PYQs

Question 9

Question 10

Question 15

Question 17

Question 20

Question 102

Question 103

Question 104

Question 111

Question 114