GATE XE topic:engineering PYQs & Answers — Page 70

Questions 691–700 of 1772. Imported answers require independent review unless marked reviewed.

Extrusion cooking is accomplished in four different stages, which are indicated as I, II, III and IV in the figure given below. Choose the correct option representing the name of each stage.

Diagram for Engineering Sciences question 144

Your answerChoose one option.

I – Feeding, II – Cooking, III – Kneading, IV – Expansion

I – Kneading, II – Feeding, III – Cooking, IV – Expansion

I – Feeding, II – Kneading, III – Cooking, IV – Expansion

I – Cooking, II – Kneading, III – Feeding, IV – Expansion

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Match the method/ value used for measuring lipid characteristics in Column I with the corresponding properties indicated by them, in Column II.

Column I P. Thiobarbituric acid test Q. Rancimat method R. Peroxide value S. Iodine value

Column II

Induction time

Degree of unsaturation

Carbon content

Hydroperoxide content

Your answerChoose one option.

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

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

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

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

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Match the peeling technique in Column I with the vegetable, for which it is used in industry, given in Column II.

Column I P. Knife peeling Q. Abrasion peeling R. Flame peeling S. Flash peeling

Column II

Brinjal

Tomato

Potato

Cucumber

Your answerChoose one option.

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

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

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

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

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Match the process in Column I with the related food component in Column II.

Column I P. Caramelization Q. Denaturation R. Oxidation S. Bleach

Column II

Lipid

Sugar

Pigment

Enzyme

Your answerChoose one option.

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

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

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

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

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Identify the correct statement(s) related to grain polysaccharides among the followings.

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

Dextrin are a group of low molecular weight polysaccharides produced by dry hydrolysis of starch.

Amylose is a linear polymer of D-glucose units joined by α (1→6) glycoside linkages.

Amylopectin is a branched chain polymer of D-galactose monomer units.

Retrogradation is a process of reassociation of amylose and formation of crystalline structure by gelatinized starch upon cooling.

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Identify the correct pair(s) of governing law with respective process operation.

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

Stoke’s law - Mass transfer

Kirchhoff’s law - Radiation heat transfer

Fourier’s law – Conduction heat transfer

Fick’s law - Molecular diffusion

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A hammer mill is used to grind blackgram. The size distribution of the blackgram is such that 80% passes through a 6-mesh (particle size = 3.36 mm) screen. The power requirement to produce a powder, 80% of which passes through a 45-mesh (particle size = 0.354 mm) screen is 4.5 kW. The power in kW required to produce a finer powder 80% of which passes through a 60-mesh (particle size = 0.25 mm) screen will be __________ (rounded off to 2 decimal places). Assume the feed rate to the mill is constant in both the cases. Use Bond’s law of size reduction.

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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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GATE XE topic:engineering PYQs

Question 144

Question 145

Question 146

Question 147

Question 148

Question 149

Question 150

Question 151

Question 152

Question 153