Size Reduction and Material Handling - Agricultural Process Engineering - Agricultural Engineering Previous Year Questions

1

2007 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2007

Crushing efficiency of any grinder rarely exceeds

A

1%

B

5%

C

10%

D

20%

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2

2007 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2007

A pulse mill grinds Bengal gram of 2 mm volume-surface mean diameter to powder of 100 μm volume-surface mean diameter. The ratio of Rittinger's to Kick's constant in the grinding operation is

A

0.317 kWh kg⁻¹

B

3.15 mm

C

315.34 μm

D

152.793 kWh ton⁻¹

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3

2007 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2007

Air carrying particles of density of 700 kg m⁻³ and average diameter of 25 μm enters a cyclone of 0.7 m diameter at a tangential velocity of 30 m s⁻¹ at 0.35 m. The density and viscosity of air are 1.1614 kg m⁻³ and 1.85 × 10⁻⁵ Pa s respectively. The terminal radial velocity of the particle is

A

0.17 m s⁻¹

B

1.69 m s⁻¹

C

3.37 m s⁻¹

D

16.52 m s⁻¹

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4

2008 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2008

Mechanical separation is divided into

A

cleaning, sorting, sieving and filtration

B

grading, weighing, sieving and filtration

C

sedimentation, centrifugation, filtration and sieving

D

sedimentation, centrifugation, cleaning and sieving

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5

2008 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2008

The energy requirement calculated using Rittinger’s law will be

A

61.53

B

35.16

C

16.43

D

5.82

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6

2008 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2008

The energy requirement calculated using Kick’s law will be

A

72.39

B

32.76

C

27.55

D

14.85

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7

2008 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2008

The energy requirement calculated using Bond’s law will be

A

57.34

B

30.57

C

15.79

D

11.25

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8

2009 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2009

Particles having average diameter of 20 μm and particle density of 1000 kg m^-3 enter a cyclone of 500 mm diameter at a linear velocity of 20 m s^-1. The separation factor of the cyclone is

A

136

B

163

C

316

D

613

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9

2013 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2013

The work index of a material is 6.25. If 80% of the feed and 80% of the product pass through IS Sieve No. 340 (3.25 mm opening) and IS Sieve No. 40 (0.42 mm opening), respectively, the power consumed in kW to crush 5000 kg h^-1 of sorghum is

A

9.77

B

20.49

C

26.29

D

32.29

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10

2013 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2013

All engineering students should learn mechanics, mathematics and how to do computation.
Which of the above underlined parts of the sentence is not appropriate?

A

I

B

II

C

III

D

IV

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11

2014 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2014

Energy required to grind a given mass of particles from a mean diameter of 12 mm to 4 mm is 12 kJ kg−1. If energy consumed to grind the same mass of particles of 2 mm mean diameter to x mm mean diameter is 252 kJ kg−1, the value of x using Rittinger's Law will be ____.

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12

2018 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2018

In a feed milling plant, it has been observed that 80% of the feed passes through IS sieve 340 (3.25 mm opening) and 80% of the ground feed passes through IS sieve 40 (0.42 mm opening). The power requirement to crush the material with a feed rate of 3 ton h⁻¹ is 6 kW. Power requirement to crush 2 ton h⁻¹ of the same feed using the above system so that 80% of the ground feed pass through IS sieve 15 (opening 0.157 mm) is ______ kW.

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13

2021 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2021

In a size reduction operation, the power required to crush 2 ton of feed material per hour is 7.2 kW. Eighty per cent of the feed and product material pass through 4.75 mm and 0.5 mm sieve openings, respectively. The work index of the material is

A

6.5

B

7.4

C

11.9

D

14.8

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14

2022 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2022

Energy requirement (E) to produce a change (dX) in dimension X of a particular size can be expressed as \(\frac{dE}{dX} = \frac{c}{X^n}\) where, c is constant and n according to Rittinger's law is ______.

A

1/2

B

√2

C

3/2

D

2

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15

2022 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2022

Sweet sorghum with an initial average particle size of 4.0 mm was pulverized using a burr mill at two different gap settings between stones. The average feed rate of the material is 200 kg h⁻¹. The resultant flour was analyzed by IS sieves for particle size determination and was found to be 0.336 mm and 0.306 mm for the first and second gap settings, respectively. Using Kick’s law, if the power required to grind the sorghum at first setting is 7.2 kW, the power requirement in kW with the second setting is _______. [round off to two decimal places]

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16

2024 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2024

Match the following types of mill in Column I based on their grinding mechanisms in Column II.

Column I	Column II
P. Attrition mill	1. Compression and shear
Q. Ball mill	2. Impact and abrasion
R. Hammer mill	3. Crushing and shear
S. Roller mill	4. Impact and shear

A

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

B

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

C

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

D

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

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17

2024 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2024

Sorghum flour obtained from a grinder was analyzed by IS sieves for particle size determination. The data obtained are as follows:

IS sieve number	100	70	50	40	30	20	PAN
Mass of flour retained (g)	0	10.1	16.5	36.2	82.8	95.0	9.4

The average particle size of the flour, in mm, is ______. (Rounded off to 3 decimal places)

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18

2025 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2025

Locust beans having average particle diameter of 7 mm are ground at a rate of 10 ton.h⁻¹ to produce average particle diameter of 0.62 mm. The mill consumes 6.7 kW power at the given rate. For the same rate of grinding, using Rittinger's law, the power required to grind the beans to an average particle diameter of 0.25 mm is __________ kW. (Rounded off to 2 decimal places)

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19

2026 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2026

Air carrying dust particles enters a cyclone separator of 800 mm diameter at a tangential velocity of 30 m.s⁻¹ near the wall. The average diameter of the dust particles is 100 μm. The separation factor is nearest to (Take g = 9.81 m.s⁻²)

A

229.36

B

611.62

C

485.72

D

3.75

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20

2026 · Agricultural Engineering · Agricultural Process Engineering · Size Reduction and Material Handling

Agricultural Engineering (AG) 2026

In grinding of black pepper, 80% feed passes through 6 mm screen, and 80% product passes through 0.5 mm screen. The gross energy required is 10 kW.h per ton of material. Assuming Bond’s law holds good, and for the same feed conditions, if 80% product passes through 0.2 mm screen, the energy required, in kW.h per ton of material, is nearest to

A

18.17

B

9.09

C

5.50

D

11.00

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