Storage Systems - Agricultural Process Engineering - Agricultural Engineering Previous Year Questions

1

2007 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2007

Angle of internal friction for rice grain is 27 °, bulk density of rice at 14% moisture content is 833 kg m⁻³ and coefficient of friction between rice and concrete wall is 0.5. For a silo of 5 m diameter and 20 m height, the ratio between the lateral pressures at the bottom of the silo obtained by Rankine and Janssen formulae is

A

1.63

B

3.16

C

6.13

D

9.47

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2

2010 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2010

Choose the most appropriate word from the options given below to complete the following sentence:
If we manage to ________ our natural resources, we would leave a better planet for our children.

A

uphold

B

restrain

C

cherish

D

conserve

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3

2011 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2011

For a mass of grain stored in a bin, the angle of internal friction of the grain is 30°. The ratio of normal pressure to the applied pressure within the bin is

A

0.25

B

0.33

C

0.50

D

1.00

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4

2011 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2011

The average interstitial velocity in a packed bed is 2.5 m s^-1 and the superficial velocity under minimum fluidized condition based on the cross-section of the empty container is 1 m s^-1. Solid particles having density of 1200 kg m^-3 and size of 0.15 mm are to be fluidized using air at 3 atm absolute pressure and 50 °C temperature having a density of 3.5 kg m^-3. The empty bed cross section is 0.4 m² and the bed contains 400 kg of solid. Pressure drop at minimum fluidized condition in Pa is

A

3.5 × 10³

B

6.5 × 10³

C

9.7 × 10³

D

17.1 × 10³

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5

2014 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2014

With increasing grain height in a deep cylindrical grain bin, the pressure at its base will

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6

2014 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2014

In a food processing plant hot water at 90°C is needed at the rate of 140% of the commodity capacity. Steam at atmospheric pressure is used for heating the water available at 25°C. Latent heat of condensation at atmospheric pressure is 2257 kJ kg⁻¹, net calorific value of hull is 12552 kJ kg⁻¹ and specific heat capacity of water is 4.184 kJ kg⁻¹ K⁻¹. Steam is generated by utilizing the hulls received as by-product from the same plant at the rate of 22% of the commodity capacity. Assuming 20% heat loss, percentage of hull used with respect to the total available amount of hull is ______________.

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7

2016 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2016

A circular grain silo with conical bottom, as shown in figure, is filled with wheat (true density 1200 kg m⁻³) with porosity of 0.6. Five hundred metric tonne of wheat fills 80% of its capacity (by volume). The total height (h) of the silo from its grain outlet end in m is __________

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8

2017 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2017

A cylindrical shallow bin is filled with grains having angle of repose of 33°. The limiting height to diameter ratio of the bin is __________.

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9

2017 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2017

A cylindrical silo, 3 m in diameter and 20 m high, is filled with barley having bulk density of 625 kg m⁻³. Coefficient of friction between grain and the bin wall is 0.45 and the ratio of lateral pressure to vertical pressure is 0.4. The lateral pressure at the base of the bin in kPa will be ________.

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10

2018 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2018

Which one of the following chemicals is NOT used for fumigation in either horizontal or vertical storage structures to kill insects?

A

Methyl bromide

B

Phosphine

C

Phostoxin

D

Silver sulphate

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11

2018 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2018

A 2 m³ biogas plant is to be operated using cow-dung as feedstock. The cow-dung is mixed with water in proportion of 1:1 (by weight) to form a slurry of density 1090 kg m⁻³. The yield of biogas is 0.036 m³ kg⁻¹ of cow-dung. If the hydraulic retention time is 40 days, volume of the digester of the biogas plant will be ______ m³.

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12

2018 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2018

A horizontal screw conveyor of length 3.2 m conveys solid grain having bulk density of 725 kg m⁻³. The screw diameter, shaft diameter and pitch of the screw are 0.6 m, 0.24 m and 0.48 m, respectively. If the screw is operating with 80% of its volumetric capacity at a speed of 50 rpm, the actual discharge of the screw is ______ ton h⁻¹.

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13

2018 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2018

Solid food particles having nominal size of 0.2 mm with shape factor of 0.8 and density of 1040 kg m⁻³ are to be fluidized using air at 28°C. The density and pressure of air at the above-mentioned condition are 1.175 kg m⁻³ and 1.013×10⁵ Pa, respectively. The voidage at minimum fluidizing condition is 0.48. Use the value of ‘g’ as 9.81 m s⁻². If cross section of the empty bed is 0.5 m² and contains 520 kg of solids, the pressure drop at minimum fluidization condition is ______ kPa.

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14

2019 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2019

Angle of internal friction of a certain grain (bulk density = 650 kg m^-3) is 30°. A bin filled with this grain experiences a pressure of 60 kPa at its base. Ignoring the factor of safety, the safe height (in meter) to which water (density = 1000 kg m^-3) can be filled in this bin (rounded off to two decimal places) is ____________.

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15

2020 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2020

A cylindrical silo with 3.0 m diameter and height to diameter ratio of 5:1 is filled with 60 metric ton wheat grains having bulk density of 725 kg m⁻³. The coefficient of friction between grain and silo wall is 0.42 and the ratio of lateral pressure to vertical pressure is 0.5. The vertical pressure at the bottom of silo in kPa (round off to 2 decimal places) is ________. [use 1 kgf = 9.81 N]

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16

2021 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2021

A cylindrical storage bin with an internal diameter of 4 m and a height of 16 m is completely filled with paddy having bulk density of 640 kg·m⁻³. The angle of internal friction between grain and bin wall is 30° and the ratio of horizontal to vertical pressures is 0.4. When the grain filling rises from 4 m to 16 m in height, the lateral pressure increases by a multiple of _______. [round off to 2 decimal places]

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17

2025 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2025

A cylindrical concrete silo of 6 m internal diameter and 24 m height is filled with rough rice having bulk density of 635 kg.m⁻³. The angle of friction between concrete wall and rough rice is 30°. The ratio between lateral and vertical pressure is 0.4. The ratio of lateral pressure at 10 m depth to the 5 m depth is __________. (Rounded off to 2 decimal places)

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18

2026 · Agricultural Engineering · Agricultural Process Engineering · Storage Systems

Agricultural Engineering (AG) 2026

A circular mild steel storage bin of 8 m height contains wheat having bulk density of 800 kg.m⁻³. The coefficient of static friction between wheat grain and bin wall is 0.40 and hydraulic radius of the bin is 1 m. Equivalent diameter of the bin, in m, is

A

4

B

8

C

1

D

2

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