Hydraulics Online Test - Paper 3

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Total Questions: 50
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1 / 50

1. A vessel having a depth of 30 cm is filled with water up to a depth of 10 cm from the top level. Find the pressure exerted at a depth of 5 cm and 15 cm from the top of the vessel respectively

a) 0, 50 kg/m^2

b) 0, 150 kg/m^2

c) 0, 100 kg/m^2

d) 50 kg/m^2, 50 kg/m^2

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2. Which of the following quantities are dimensionless?

a) surface tension

b) specific weight

c) angular velocity

d) Mach number

3 / 50

3. *Chazy's formula is given by

a) v = C√mi

b) v = m√ci

c) v = C√mci

d) v = i√mc

4 / 50

4. Water hammer is a phenomenon that occurs

a) when pressure increases sudden closure of the valve

b) when pressure decreases sudden opening of the valve

c) due to the elastic material of the pipe

d) due to the incompressible nature of the fluid

5 / 50

5. *Molecules of fluids get attracted due to

a) capillary action

b) surface tension

c) adhesion

d) cohesion

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6. *Variation in volume of liquid with variation in pressure is called

a) plasticity

b) viscosity

c) compressibility

d) none of the above

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7. If the specific gravity of oil is 0.7, then find the density of oil

a) 1000 kg/cm^3

b) 900 kg/cm^3

c) 800 kg/cm^3

d) 700 kg/cm^3

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8. *What affects the quantity of mass of a fluid?

a) acceleration due to gravity

b) distance from the center of the earth

c) elevation of the body

d) none of the above

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9. Mach number is the ratio of inertia force to

a) viscosity

b) Froude number

c) gravitational force

d) elasticity

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10. If the forces are due to inertia and gravity, and frictional resistance plays only a minor role, the design of channels is made by comparing

a) Reynold number

b) Froude number

c) Weber number

d) Mach number

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11. *Rotameter is used for measuring

a) density of fluids

b) value of fluids in a pipe

c) discharge of fluids

d) pressure in fluids

12 / 50

12. *The difference between the total energy gradient line and the total energy line is

a) kinetic head

b) pressure head

c) datum head

d) loss of head

13 / 50

13. An intensifier is used to increase

a) pressure

b) temperature

c) energy

d) none of the above

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14. *Capillarity of water is

a) directly proportional to surface tension

b) inversely proportional to the angle of contact

c) inversely proportional to the diameter of the pipe

d) all of the above

15 / 50

15. The two depths at which the specific energy is the same are called

a) alternate depths

b) conjugate depths

c) critical depths

d) normal depths

16 / 50

16. A fluid particle may possess the displacement of

a) translation

b) rotation

c) distortion

d) all of the above

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17. *The magnitude of capillary rise is more in:

a) silts

b) sands

c) clays

d) gravels

18 / 50

18. *A flow is said to be laminar when

a) the fluid particles move in a zig-zag way

b) the Reynolds number is high

c) the fluid particles move in layers parallel to the boundary

d) none of the above

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19. The ratio of the percentage error in the discharge and the percentage error in the measurement of head over a triangular notch is

a) 2/3

b) 3/2

c) 2/5

d) 5/2

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20. Liquids

a) cannot be compressed

b) do not occupy definite shape

c) are not affected by change in pressure and temperature

d) none of the above

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21. *The width of a weir with end contraction is

a) equal to the width of the channel

b) less than the width of the channel

c) half the width of the channel

d) none of the above

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22. To ensure that water does not rise more than 100 cm above the crest, for a discharge of 5.00 m^3/sec, the length of the weir will be (Cd = 0.62)

a) 2.48 m

b) 2.73 m

c) 2.50 m

d) 2.51 m

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23. *The main assumption of Bernoulli's equation is

a) the velocity of energy of liquid particles across any cross-section of a pipe is uniform

b) no external force except gravity acts on the liquid

c) there is no loss of energy of the liquid while flowing

d) all of the above

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24. *The types of instrument used to measure low pressure with accuracy is

a) piezometer

b) barometer

c) micro manometer

d) mechanical gauge

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25. *The discharge through a trapezoidal channel is maximum when

a) half of the width = sloping side

b) top width = 1/2 sloping side

c) top width = 1.5 sloping side

d) none of the above

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26. *If the velocity, pressure, density, etc., do not change at a point with respect to time, the flow is called

a) uniform

b) incompressible

c) non-uniform

d) steady

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27. *The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at its centroid if

a) the area is horizontal

b) the area is vertical

c) the area is inclined

d) all of the above

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28. The ratio of the percentage error in the discharge and the percentage error in the measurement of head over a rectangular notch is

a) 1/2

b) 2/3

c) 3/2

d) 3/4

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29. The continuity equation

a) expresses the relationship between work and energy

b) relates the momentum per unit volume between two points on a stream line

c) relates the mass rate of flow along a stream line

d) requires that Newton's second law of motion be satisfied at every point in the fluid.

30 / 50

30. The section of the Jet leaving an orifice, having the minimum cross-section area, is called

a) orifice meter

b) venturimeter

c) mouthpiece

d) vena contracta

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31. To avoid an interruption in the flow of a siphon, the air vessel is provided

a) at the inlet

b) at the outlet

c) at the summit

d) at the point between the inlet and outlet

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32. In an inclined pipe, the pressure difference at its two ends is due to

a) sudden head drop at the inlet

b) exit head drop

c) frictional loss head

d) all of the above

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33. If S is the height of the crest above the base of the channel and H is the head of water over the weir, whose length is L and discharge is Q m^3/sec, the velocity of approach V_a is

a) √2gh

b) Q/L(H-L)

c) Q/L(H+L)

d) L(H+S)/Q

34 / 50

34. Falling drops of water become spheres due to

a) adhesion

b) cohesion

c) surface tension

d) viscosity

35 / 50

35. *Differential manometers are used to measure

a) pressure in water channels

b) difference in pressure at two points

c) atmospheric pressure

d) very low pressure

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36. Total head of a particle in motion is the sum of

a) potential head and kinetic head

b) kinetic head and pressure head

c) potential head and pressure head

d) potential head, kinetic head, and pressure head

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37. The viscosity of gases varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

38 / 50

38. *In flow, the liquid particles may possess

a) potential energy

b) kinetic energy

c) pressure energy

d) all of the above

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39. When the pipes are connected in series, the total rate of flow

a) is equal to the sum of the rate of flow in each pipe

b) is equal to the reciprocal of the sum of the rate of flow in each pipe

c) is the same as flowing through each pipe

d) none of the above

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40. *The upper surface of the notch over which water flows is known as

a) vein

b) nappe

c) sill

d) none of the above

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41. A rise or fall of liquid in a glass tube of a very small diameter when dipped is

a) directly proportional to the force per unit length of periphery

b) directly proportional to the sine of the angle of contact

c) directly proportional to the specific weight of the liquid

d) inversely proportional to the diameter of the glass tube

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42. *The rate of flow through a V-notch varies as:

a) H

b) H1/2

c) H3/2

d) H5/2

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43. *The hydraulic ram is a pump that works on

a) the principle of water hammer

b) the principle of centrifugal action

c) the principle of reciprocation action

d) all of the above

44 / 50

44. Reynolds number is the ratio of initial force and

a) viscosity

b) elasticity

c) gravitational force

d) surface tension

45 / 50

45. *Which of the following statements is valid?

a) a fluid with low viscosity resists motion because its molecular structure gives it a lot of internal friction

b) viscosity describes the internal friction of a moving fluid

c) two fluids with the same dynamic viscosities have the same kinematic viscosities irrespective of their densities

d) intensity of liquid pressure at the bottom of a tank is w.g.h/3

46 / 50

46. *Bernoulli's equation is applied to

a) venturimeter

b) orifice meter

c) pitot tube

d) all of the above

47 / 50

47. For a long pipe, the head loss

a) at the entrance is ignored

b) at the outlet is ignored

c) at the entrance and outlet both are ignored

d) due to friction is ignored

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48. The Manning's formula for flow in an open channel is given by

a) v = n R^2/3 S^1/2

b) none of the above

c) v = 1/n R^2/3 S^1/2

d) v = 1/n R^1/2 S^2/3

49 / 50

49. A ideal fluid

a) is frictionless and incompressible

b) obey Newton's law of viscosity

c) is similar to gas

d) is very viscous

50 / 50

50. *1 m head is equivalent to

a) 0.1 kg/cm^2

b) 0.2 kg/cm^2

c) 0.3 kg/cm^2

d) 0.4 kg/cm^2

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