Irrigation Water Conveyance and Application Methods - Irrigation and Drainage Engineering - Agricultural Engineering Previous Year Questions

1

2007 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2007

The discharge through a 90° V-notch for a head of 0.5 m and coefficient of discharge of 0.6 is

A

0.25 m³ s⁻¹

B

0.50 m³ s⁻¹

C

0.65 m³ s⁻¹

D

0.75 m³ s⁻¹

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2

2007 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2007

A field is irrigated by constructing 100 m long furrows spaced at 0.75 m apart. The advance time to the end of furrows was 30 min with an inflow rate of 2 litre s⁻¹. After that the inflow rate was cutback to 0.5 litre s⁻¹ and continued for one hour. The average depth of irrigation is

A

2.4 cm

B

7.2 cm

C

9.0 cm

D

18.0 cm

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3

2007 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2007

A sprinkler system consists of two 192 m long laterals. On each lateral, sixteen sprinklers are located at an interval of 12 m. The spacing between the laterals is 10 m. The required capacity (in litre s⁻¹) of sprinkler system for application rate of 1.0 cm h⁻¹ is

A

5.33

B

10.66

C

14.22

D

17.06

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4

2007 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2007

A 50 km long canal with an average width of 25 m is used for irrigation. Mean daily evaporation as measured from a Class A evaporation pan is 5 mm d⁻¹. Considering the pan coefficient as 0.80, the mean daily evaporation loss from this canal is

A

5.00 × 10³ m³ d⁻¹

B

6.25 × 10³ m³ d⁻¹

C

5.00 × 10⁴ m³ d⁻¹

D

6.25 × 10⁵ m³ d⁻¹

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5

2007 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2007

To deliver 1.3 litre min⁻¹ discharge, the operating pressure of a 3 m long, 3 mm diameter bubbler tube is

A

1.64 kPa

B

16.46 kPa

C

164.61 kPa

D

1646.20 kPa

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6

2007 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2007

The specific energy of flowing water is

A

1.25 m

B

1.45 m

C

2.25 m

D

3.25 m

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7

2007 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2007

The required pump capacity is

A

67.95 litre min⁻¹

B

74.75 litre min⁻¹

C

82.22 litre min⁻¹

D

83.06 litre min⁻¹

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8

2008 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2008

A flow of 150 L s⁻¹ was supplied for 8 hours from a tank to irrigate 2 ha of land. It was found that the actual delivery rate at the farm was less than 150 L s⁻¹. If the conveyance loss was 864 m³ and percolation and runoff losses in the field were 240 and 760 m³ respectively, the water application efficiency of this system is

A

80%

B

61%

C

77%

D

71%

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9

2008 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2008

If the nozzle produces droplets with a volume median diameter of 200 micron at 1 MPa, the droplet size in micron at the desired flow rate is

A

104.17

B

160.91

C

248.60

D

594.89

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10

2008 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2008

The field irrigation requirement will be

A

21600 m³

B

10800 m³

C

2.16 x 10⁵ m³

D

27000 m³

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11

2009 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2009

A venturimeter of 75 mm diameter is fitted to a horizontal pipe of 150 mm diameter. Gauge pressure in the venturimeter in case of no flow is 2 m of water. Taking atmospheric pressure as 10 m of water, the theoretical flow through the pipeline in litres per second, when the throat point pressure is 2.60 m of water (absolute), is

A

15

B

30

C

60

D

75

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12

2010 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2010

A cross regulator is usually provided

A

at the head of the off-taking channel

B

in the main channel upstream of the off-taking channel

C

in the main channel downstream of the off-taking channel

D

in the watercourse to regulate the outlets

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13

2010 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2010

The Local Apparent Time (LAT) corresponding to 14 h 30' Indian Standard Time (IST) at a place in India (19° 07' N, 72° 51' E) in the month of April with a time correction of zero min will be

A

13 h 51' 24"

B

14 h 9' 39"

C

14 h 30'

D

15 h 8' 36"

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14

2010 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2010

The following figure shows two advance curves for surface irrigation.

The advance represented by curve M is slower than N. This could be attributed to
P. the inflow rate to the field is lower
Q. the intake rate of the soil is lower
R. the field slope is flatter
S. the hydraulic roughness is greater for curve N than for curve M

A

P, Q

B

P, R

C

Q, S

D

R, S

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15

2010 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2010

A pipeline carrying a discharge of 500 litres per minute branches into two parallel pipes, X and Y, as shown in the following figure. The length and diameter of pipes X and Y are shown in the figure. The friction factor, f, for all pipes is 0.030. The ratio of flow in pipes X and Y is

A

0.36

B

0.44

C

0.67

D

1.00

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16

2010 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2010

In order to evaluate irrigation distribution, an irrigator estimates the depth of infiltration, in mm, around a field as given below. 42 36 32 38 40 32 35 34 25 28 29 31 36 30 32 28 40 38 34 44 The distribution uniformity for the irrigation is

A

80.4

B

81.9

C

87.9

D

88.1

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17

2010 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2010

The discharge rate per nozzle in m³ h^-1 will be

A

0.175

B

0.215

C

0.350

D

0.430

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18

2011 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2011

A concrete-lined non-circular tunnel has a semi-circle at the top and a rectangular section at the bottom. The semi-circle has a diameter of 6 m whereas the rectangular section is 6 m wide and 3 m high. The tunnel carries a discharge of 128 m³ s^-1. If the friction factor f = 0.017, then the head loss in 1 km length of the tunnel in m will be

A

0.57

B

1.15

C

2.29

D

4.58

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19

2013 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2013

During land leveling of agricultural land for irrigation and drainage purposes, the acceptable deviation in elevation from the design value in metre is

A

0.015

B

0.025

C

0.055

D

0.150

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20

2013 · Agricultural Engineering · Irrigation and Drainage Engineering · Irrigation Water Conveyance and Application Methods

Agricultural Engineering (AG) 2013

Pan evaporation data recorded at a certain location over a period of one week are 4.0, 4.3, 4.6, 4.9, 5.12, 5.18, and 6.21 mm. If irrigation scheduling based on ratio of irrigation water (IW) to cumulative pan evaporation (CPE) is practiced, the depth of irrigation at an interval of a week for IW/CPE = 0.9 is

A

3.60

B

4.41

C

5.59

D

30.88

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