Hydraulics Online Test - Paper 3

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Total Questions: 50
Time Allotted: 50 minutes
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1 / 50

1. *To measure atmospheric pressure, we use

a) barometers

b) piezometer

c) manometers

d) differential manometers

2 / 50

2. *An orifice is called a large orifice if the water head is

a) two times the diameter of the pipe

b) three times the diameter of the pipe

c) four times the diameter of the pipe

d) five times the diameter of the pipe

3 / 50

3. When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as:

a) submerged weir

b) narrow-crested weir

c) broad-crested weir

d) ogee weir

4 / 50

4. *Viscosity of a liquid

a) drops with temperature

b) rises with temperature

c) does not vary with temperature

d) remains constant up to a certain temperature

5 / 50

5. *Bernoulli's equation is applied to

a) venturimeter

b) orifice meter

c) pitot tube

d) all of the above

6 / 50

6. *Venturimeter is used to measure

a) rate of flow

b) velocity

c) depth of flow

d) all of the above

7 / 50

7. Cavitations is collapsed by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

8 / 50

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

a) steady flow

b) unsteady flow

c) non-uniform flow

d) compressible flow

9 / 50

9. For the laminar flow through a circular pipe, the maximum velocity is

a) the maximum velocity=1.5 times the average velocity

b) the maximum velocity=2.0 times the average velocity

c) the maximum velocity=2.5 times the average velocity

d) none of the above

10 / 50

10. *Molecules of fluids get attracted due to

a) capillary action

b) surface tension

c) adhesion

d) cohesion

11 / 50

11. Find the capillary rise/fall in a glass tube when immersed in mercury with the following given data: surface tension, σ = 0.52 gmf/cm, angle of contact, θ = 130°, S.G. of mercury = 13.6, diameter of the pipe = 2.5 mm.

a) 0.393 cm rise

b) 0.393 cm fall

c) neither fall nor rise

d) all of the above

12 / 50

12. Hooke's law for solids is analogous to

a) Newton's law of viscosity

b) Pascal's law

c) Boundary layer theory

d) continuity equation

13 / 50

13. 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

14 / 50

14. If the fluid particles move in straight lines and all the lines are parallel to the surface, the flow is called

a) steady

b) uniform

c) compressible

d) laminar

15 / 50

15. A substance which deforms continuously under the action of shear stress is called

a) fluid

b) liquid

c) solid

d) gas

16 / 50

16. *The rate of flow through a venturimeter varies as

a) H^1/2

b) H^3/2

c) H^4/2

d) H^5/2

17 / 50

17. In the case of a broad-crested weir, the depth of water h at the end of the still is given by

a) h = H/2

b) h = 2H/3

c) h = 3H/4

d) h = H

18 / 50

18. *Pascal's law states that pressure at a point is equal in all directions

a) in a liquid at rest

b) in a fluid at rest

c) in a laminar flow

d) in a turbulent flow

19 / 50

19. 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

20 / 50

20. *The most economical section of a circular channel for the maximum velocity is when

a) depth of water = 0.810 diameter

b) hydraulic mean depth = 0.304 diameter of the circular section

c) wetted perimeter = 2.245 diameters of the circular section

d) all of the above

21 / 50

21. Critical depth (he) is given by (where q= rate of flow per unit width of channel)

a) (q^2/g)^1/3

b) (q^2/g)^1/4

c) (q^2/g)^1/2

d) none of the above

22 / 50

22. In an open channels the analysis of a sugar is done by using

a) continuity equation

b) momentum equation

c) energy equation

d) none of the above

23 / 50

23. *The orifice used for low discharge is

a) rectangular

b) circular

c) square

d) triangular

24 / 50

24. In fluids, steady flow occurs when

a) the condition of flow change steadily with time

b) the condition of flow do not change with time

c) the condition of flow remains the same at adjacent points

d) the velocity vector remains constant at a point

25 / 50

25. Practical fluids possess

a) viscosity

b) surface tension

c) compressibility

d) all of the above

26 / 50

26. *The magnitude of water hammer depends upon

a) the length of the pipeline

b) elastic properties of liquid

c) elastic properties of the pipe material

d) diameter of the pipeline

27 / 50

27. 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

28 / 50

28. 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

29 / 50

29. Mouthpieces are used to measure

a) velocity

b) pressure

c) head

d) rate of flow

30 / 50

30. *Chazy's formula is given by

a) v = C√mi

b) v = m√ci

c) v = C√mci

d) v = i√mc

31 / 50

31. *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

32 / 50

32. The upward water pressure at the base of the structure is called

a) up

b) down

c) uplist

d) downlift

33 / 50

33. *If the velocity, pressure, density, etc., change at a point with respect to time, the flow is called

a) uniform

b) compressible

c) unsteady

d) incompressible

34 / 50

34. The attraction among different particles of the same material is

a) adhesion

b) cohesion

c) corrosion

d) fusion

35 / 50

35. The difference in pressure head measured by a mercury-oil differential manometer for a 20 cm difference of mercury level will be (specific gravity of oil-0.8)

a) 2.72m of oil

b) 2.52m of oil

c) 3.20m of oil

d) 0.2m of oil

36 / 50

36. *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

37 / 50

37. *The actual velocity through an orifice is........... than the theoretical velocity.

a) more

b) less

c) equal

d) not defined

38 / 50

38. The viscosity of liquids varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

39 / 50

39. *Uniform flow is said to occur when

a) the size and shape of the cross-section in a particular length remain constant

b) the size and shape of the cross-section change along a length

c) the frictional loss in the particular length of the channel will be more than the drop in elevation

d) the frictional loss in the particular length of the channel will be less than the drop in elevation

40 / 50

40. The depth of flow at which the specific energy is minimum is called

a) normal depth

b) critical depth

c) alternate depth

d) all of the above

41 / 50

41. 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

42 / 50

42. *The flow in which the path of individual particles of liquid cross each other is called

a) uniform flow

b) turbulent flow

c) stream line flow

d) none of the above

43 / 50

43. The term P/pg is known as

a) kinetic energy

b) pressure energy per unit weight

c) kinetic energy per unit weight

d) none of the above

44 / 50

44. From a nozzle exposed to the atmosphere, the liquid jet traverses

a) a straight line

b) a circular path

c) a parabolic path

d) an elliptical path

45 / 50

45. *The phenomenon occurring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream, causing a distinct rise of the liquid surface, is

a) water hammer

b) hydraulic jump

c) critical discharge

d) all of the above

46 / 50

46. With a clinging nappe of a weir, the excess discharge is

a) 6% to 7%

b) 8% to 10%

c) 12% to 15%

d) 25% to 30%

47 / 50

47. *An independent mass of a fluid does not possess

a) elevation energy

b) kinetic energy

c) pressure energy

d) none of the above

48 / 50

48. When the pipes are connected in parallel, the total loss of head

a) is equal to the sum of the loss of head in each pipe

b) is the same as in each pipe

c) is equal to the reciprocal of the sum of the loss of head in each pipe

d) none of the above

49 / 50

49. A steady uniform flow is through a

a) long pipe at decreasing rate

b) long pipe at constant rate

c) long pipe at increasing rate

d) none of the above

50 / 50

50. The flow in which each liquid particle has a definite path is called

a) stream line flow

b) uniform flow

c) steady flow

d) turbulent flow

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