Soil-Water-Plant Relationship - Irrigation and Drainage Engineering - Agricultural Engineering Previous Year Questions

1

2007 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2007

A soil 0.8 m deep has volumetric water content of 0.12. The quantity of water needed to bring the volumetric water content to 0.30 is

A

0.144 m of water

B

0.180 m of water

C

0.336 m of water

D

0.420 m of water

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2

2007 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2007

The depth for minimum specific energy is

A

0.56 m

B

0.66 m

C

0.86 m

D

1.06 m

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3

2008 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2008

A clayey soil has a field capacity of 0.38 m³ m⁻³ and wilting point of 0.24 m³ m⁻³. If the specific weight of the soil is 12.75 kN m⁻³ and the effective root-zone depth is 0.8 m, the available moisture holding capacity is

A

15.6 cm

B

11.2 cm

C

1.12 cm

D

20.8 cm

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4

2008 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2008

A spherical tank of 2 m diameter is filled with an edible oil of specific gravity 0.92. If the pressure measured at the highest point in the tank is 70 kPa, the total pressure (kPa) in the tank will be

A

80.5

B

85.3

C

88.1

D

92.2

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5

2008 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2008

The frequency of irrigation will be

A

1 day

B

3 days

C

7 days

D

5 days

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6

2008 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2008

Hydraulic heads in m at P and Q respectively will be

A

100, 130

B

160, 170

C

60, 40

D

170, 160

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7

2009 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2009

The empirical method for computing the consumptive use of a crop using the mean monthly temperature and day light hours is

A

Thornthwaite

B

Blaney Criddle

C

Hargreaves

D

Lowry Johnson

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8

2009 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2009

The diameter of a grain storage bin is 4 m and the depth is 16 m. It is completely filled with wheat having bulk density of 800 kg m^-3. The angle of friction between wheat and wall is 24°. The ratio of lateral and vertical pressure intensity is 0.4. The lateral pressure intensity of wheat in kPa on the bin wall at 2 m depth is

A

2.85

B

5.28

C

8.25

D

8.52

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9

2009 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2009

Statement for Linked Answer Questions 59 and 60:
A check basin of size 15 m × 12 m is to be irrigated using a stream of 26 litre per second. The depth of crop root zone is 1.3 m and the apparent specific gravity of the root zone soil is 1.6. The water holding capacity of the soil is 16 %. Irrigation is to be applied when the soil moisture content in the crop root zone attains 12%. Deep percolation loss is neglected.
The net irrigation requirement in mm is

A

43.2

B

63.2

C

73.2

D

83.2

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10

2009 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2009

The duration of irrigation in minutes to replenish up to field capacity is

A

4.8

B

9.6

C

16.6

D

24.6

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11

2011 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2011

Capillary water is held in the soil due to

A

absorption force

B

surface tension force

C

gravitational force

D

osmotic force

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12

2011 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2011

If the root zone depth is 0.8 m, the volume of water required to irrigate the field in m³ will be

A

2700

B

3150

C

3600

D

4050

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13

2013 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2013

A 10 ha field has \(1.2 \text{ m}\) deep layer of sandy loam soil underlain by sandy soil up to a depth of \(5 \text{ m}\). A pre-irrigation rainfall brings moisture content of the top \(0.3 \text{ m}\) layer to its field capacity. The moisture content of rest of the sandy loam layer remains at permanent wilting point. The volumetric moisture content at field capacity and permanent wilting point are 32 and 16%, respectively for the sandy loam soil. The field is irrigated with a stream size of \(240 \text{ L s}^{-1}\) for 24 hours. Considering the drainage from the sandy loam soil as deep percolation, application efficiency and deep percolation ratio in percent respectively are

A

56.40 and 43.60

B

69.44 and 30.56

C

75.18 and 24.82

D

92.60 and 7.40

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14

2013 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2013

the corresponding head in m is

A

0.00015

B

0.035

C

0.283

D

67.13

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15

2014 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2014

A crop has effective root zone depth of 1200 mm and monthly (30 days) crop evapotranspiration of 260 mm. The effective rainfall during 30 days period is 20 mm. The field capacity and permissible soil moisture depletion (volume basis) are 16% and 8%, respectively. The irrigation interval in days for the crop will be

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16

2016 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2016

In a cropped field, the following data are observed.
Moisture content at field capacity (weight basis) = 36%
Current moisture content (weight basis) = 24%
Bulk density of soil = 1.5 Mg m^-3
Effective root zone depth = 0.8 m
Conveyance efficiency = 80%
Application efficiency = 90%
To bring soil moisture content to field capacity, the depth of irrigation in mm will be ______

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17

2017 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2017

Antecedent Moisture Conditions (AMC) for a soil are defined on the basis of total rainfall occurred during previous _____ days.

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18

2017 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2017

Thickness of capillary zone above the water table varies

A

linearly with the pore-size of soil

B

inversely with the height of water table

C

linearly with the height of water table

D

inversely with the pore-size of soil

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19

2017 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2017

The soil of a cropped field has field capacity of 25% and wilting point of 13% on weight basis. The effective root-zone depth of the crop is 0.70 m and the consumptive use of water by the crop is 5 mm day⁻¹. Apparent specific gravity of the soil is 1.50. If the allowable soil moisture depletion is 40%, the permissible moisture depletion between irrigations and the frequency of irrigation are

A

5 cm; 10 days

B

10 cm; 7 days

C

8 cm; 12 days

D

4 cm; 8 days

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20

2018 · Agricultural Engineering · Irrigation and Drainage Engineering · Soil-Water-Plant Relationship

Agricultural Engineering (AG) 2018

The elevations of pressure gauge and porous cup of the tensiometer installed in unsaturated zone are 145.8 m and 144.2 m, respectively. Pressure measured at the gauge is -19.62×10³ N m⁻². The specific weight of water is 9810 N m⁻³. The estimated pressure at the porous cup is ______ N m⁻².

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