Mechanical Operations - Food Engineering - Life Sciences Previous Year Questions

1

2009 · Life Sciences · Food Engineering · Mechanical Operations

Life Sciences (XL) 2009

Match the properties in Group 1 with the downstream operations in Group 2 :

Group 1	Group 2
P. Size	1. Extraction
Q. Density	2. Distillation
R. Volatility	3. Filtration
S. Solubility	4. Sedimentation

A

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

B

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

C

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

D

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

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2

2012 · Life Sciences · Food Engineering · Mechanical Operations

Life Sciences (XL) 2012

Make the correct match between specific food processing operations in Group I with their mechanism of action in Group II.

A

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

B

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

C

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

D

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

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3

2016 · Life Sciences · Food Engineering · Mechanical Operations

Life Sciences (XL) 2016

The rate of cream separation in a disc bowl centrifuge can be increased by ______ .

A

Increasing the size of the bowl

B

Lower viscosity of fluid

C

Increasing RPM of the bowl

D

All of these

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4

2018 · Life Sciences · Food Engineering · Mechanical Operations

Life Sciences (XL) 2018

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

Group I	Group II
P. Cleaning	1. Quality separation
Q. Grading	2. Clarification
R. Size reduction	3. Screening
S. Filtration	4. Comminution

A

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

B

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

C

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

D

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

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5

2022 · Life Sciences · Food Engineering · Mechanical Operations

Life Sciences (XL) 2022

Homogenization of milk leads to disintegration of fat globules by

A

Turbulence and pasteurization

B

Pasteurization and cavitation

C

Pasteurization and pressurization

D

Turbulence and cavitation

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6

2022 · Life Sciences · Food Engineering · Mechanical Operations

Life Sciences (XL) 2022

Match the size reduction equipment in Column I with the method of operation in Column II.

Column I	Column II
P. Hammer mill	1. Compression
Q. Burr mill	2. Impact
R. Crushing rolls	3. Cutting
S. Rotary knife	4. Attrition

A

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

B

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

C

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

D

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

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7

2022 · Life Sciences · Food Engineering · Mechanical Operations

Life Sciences (XL) 2022

Identify the correct pair(s) of milling equipment and the grain for which it is used.

A

Mist polisher–Rice

B

Break roll–Wheat

C

Rubber roll–Pigeon pea

D

Beall degermer–Maize

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8

2023 · Life Sciences · Food Engineering · Mechanical Operations

Life Sciences (XL) 2023

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.

A

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

B

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

C

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

D

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

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9

2024 · Life Sciences · Food Engineering · Mechanical Operations

Life Sciences (XL) 2024

Which of the following statements is/ are true?

A

Hagen-Poiseuille's law is used for calculation of molecular diffusion.

B

Fick's law is used for calculation of energy requirement in size reduction.

C

Rittinger's law is used for calculation of energy requirement in size reduction.

D

Stokes law is used for derivation of terminal velocity.

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10

2025 · Life Sciences · Food Engineering · Mechanical Operations

Life Sciences (XL) 2025

In a typical grinding operation, 80% of the feed material passes through a sieve opening of 4.75 mm; whereas, 80% of the ground product passes through 0.5 mm opening. If the power required to grind 2 tonnes/h of the feed material is 3.8 kW, the work index of the material is ______. (rounded off to 2 decimal places)

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11

2026 · Life Sciences · Food Engineering · Mechanical Operations

Life Sciences (XL) 2026

Which one of the following statements is true for a high-pressure homogenizer?

A

Homogenization takes place only due to uniform mixing of solid and liquid

B

Solid particles in the suspension are disintegrated due to the high shear rate exerted by the liquid

C

High pressure steam is injected to dissolve the solids

D

Solid particles in the suspension are compressed into a cake under high pressure

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12

2026 · Life Sciences · Food Engineering · Mechanical Operations

Life Sciences (XL) 2026

During constant pressure cake filtration, for an incompressible cake deposited uniformly over a constant filter surface area,

A

the cake resistance remains constant

B

the cake resistance increases in proportion to the cake thickness

C

the filtration rate remains constant

D

the filtration rate decreases with time

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