Fluid Mechanics - Soil and Water Conservation Engineering - Agricultural Engineering Previous Year Questions

1

2007 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2007

A fluid in which shear stress is more than the yield value and proportional to the rate of shear strain is called

A

Newtonian fluid

B

Non-Newtonian fluid

C

Ideal plastic fluid

D

Real fluid

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2

2007 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2007

The left limb of a U-tube manometer is connected to a pipe in which water flows and the right limb containing mercury is open to the atmosphere. The center of the pipe is 200 mm below the level of mercury in the right limb and difference of mercury levels in the two limbs is 300 mm. The pressure in the pipe line is

A

19 kPa

B

29 kPa

C

39 kPa

D

49 kPa

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3

2008 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2008

The velocity of flow of water through a drop inlet pipe spillway is 4 m s⁻¹ and the friction loss coefficient is 0.12. Maximum slope that can be provided to the pipe to maintain pipe flow condition is

A

8.9%

B

9.8%

C

10.3%

D

10.8%

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4

2008 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2008

In the Moody diagram, the third parameter is ε/D. Here, ε is

A

the equivalent uniform sand grain roughness

B

an arbitrarily chosen roughness magnitude

C

median size in a non-uniform sand grain roughness

D

mean height of the actual roughness of commercial pipes

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5

2008 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2008

Atmospheric pressure at a place is equal to 10 m of water. A liquid has a specific weight of 12 kN m⁻³. The absolute pressure at a point 2 m below the free surface of liquid in kPa is

A

2.4

B

12.4

C

24.0

D

122.1

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6

2008 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2008

The weight of a hollow sphere is 100 N. If it floats in water just fully submerged, the external diameter of the sphere is

A

112 mm

B

213 mm

C

269 mm

D

315 mm

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7

2008 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2008

The velocity of a fluid in a pipe A of diameter D is v m s⁻¹. This pipe is connected with another pipe B of diameter 2D. Reynold's number in pipe A in relation to pipe B is

A

same

B

half

C

double

D

triple

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8

2009 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2009

An earthen embankment with a pipe spillway is constructed to create temporary storage in a gully. The pipe of 10 m length has to carry a peak discharge of 1 m³ s^-1 at an available head of 4 m. Entrance loss coefficient for the square entrance is 0.50 and the friction loss coefficient is 0.15. Required diameter of the pipe in m is

A

0.50

B

0.60

C

0.75

D

1.00

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9

2010 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2010

While deriving the Chezy formula for uniform flow, it is assumed that there is a balance between

A

gravity and inertial forces

B

inertial and viscous forces

C

frictional and gravity forces

D

frictional and inertial forces

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10

2011 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2011

If the density of a fluid changes from point to point in a flow region, the flow is called

A

steady flow

B

unsteady flow

C

non-uniform flow

D

compressible flow

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11

2011 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2011

The viscosity of a Newtonian fluid depends primarily on X and to a lesser degree on Y. X and Y are

A

X = temperature, Y = flow velocity

B

X = flow velocity, Y = pressure

C

X = temperature, Y = pressure

D

X = roughness of the surface across which the fluid flows, Y = flow velocity

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12

2013 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2013

A hemispherical vessel of \(300 \text{ mm}\) diameter is completely filled with oil and water. If the oil layer is \(50 \text{ mm}\) deep on the top, the volume of water in the vessel in litres is

A

1.27

B

3.73

C

7.07

D

14.14

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13

2017 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2017

A trapezoidal notch, placed over an emergency spillway, has the following details: Top width = 2 m Bottom width = 1 m Height = 0.5 m Coefficient of discharge for the triangular portion = 0.65 Coefficient of discharge for the rectangular portion = 0.68 For a flow head of 0.4 m over the notch, the discharge in L s⁻¹ will be about

A

155

B

353

C

508

D

663

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14

2019 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2019

Water is flowing at a velocity of 1.6 m s^-1 in a pipe of diameter 8 cm and length 100 m. Assuming the value of coefficient of friction for pipe, f = 0.005 and acceleration due to gravity, g = 9.81 m s^-2, the head loss (in meter) due to friction in the pipe is

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15

2019 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2019

A parabolic grassed water channel 8 m wide at the top and 60 cm deep is laid on a slope of 3%. Assuming the value of 'n' in Manning's formula as 0.04 m^-1/3 s, the discharge capacity (in m³ s^-1) of the channel (rounded off to two decimal places) is ______________.

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16

2019 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2019

A parabolic grassed water channel 8 m wide at the top and 60 cm deep is laid on a slope of 3%. Assuming the value of 'n' in Manning's formula as 0.04 m−1/3 s, the discharge capacity (in m3 s−1) of the channel (rounded off to two decimal places) is ________.

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17

2022 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2022

The ratio of inertial forces to viscous forces is knows as ______.

A

Froude number

B

Reynolds number

C

Power number

D

Biot number

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18

2022 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2022

The pressure drop through a well-designed constriction is to be used for measuring the velocity of flow through a circular pipe. If the pressure drop from a 0.1 m diameter section to a 0.05 m diameter section of the pipe is 7.5 kPa, the velocity in m s⁻¹ in the 0.1 m diameter section of the pipe is __________.
(Take density of liquid = 1000 kg m⁻³)

A

0.5

B

1.0

C

1.5

D

2.0

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19

2023 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2023

A trapezoidal grassed waterway with side slope (H:V) of 1:1 carries a design discharge of 1 m³ s⁻¹. The bed slope and Manning’s roughness coefficient of this channel are 1% and 0.04, respectively. The design depth of the best hydraulic trapezoidal grassed waterway section in m is __________ (rounded off to 2 decimal places).

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20

2023 · Agricultural Engineering · Soil and Water Conservation Engineering · Fluid Mechanics

Agricultural Engineering (AG) 2023

A vector \[\vec{F} = 5\hat{i} - 10\hat{j} + 8\hat{k}\] is passing through the origin of a 3-D frame. Considering the tendency of rotation in the counter clockwise direction as positive, the moment about a point A: (3, 4, 8) is

A

\(-16\hat{i} + 112\hat{j} + 50\hat{k}\)

B

\(112\hat{i} + 16\hat{j} - 50\hat{k}\)

C

\(50\hat{i} - 112\hat{j} + 16\hat{k}\)

D

\(-112\hat{i} - 16\hat{j} + 50\hat{k}\)

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