Hydraulics Online Test - Paper 3

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Vikash chaudhary

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

1. Gauge pressure is

a) absolute - atmosphere

b) absolute + atmosphere

c) atmospheric ± absolute

d) none of the above

2 / 50

2. If fluid or flow parameters at any given instant remain the same at every point in space, it is called:

a) steady flow

b) laminar flow

c) uniform flow

d) rotational flow

3 / 50

3. 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

4 / 50

4. The imaginary line drawn such that the tangents at its all points indicate the direction of the velocity of the fluid particle at each point is called

a) path line

b) stream line

c) potential line

d) streak line

5 / 50

5. *The energy possessed by a fluid by virtue of its existing pressure is called

a) elevation energy

b) kinetic energy

c) potential energy

d) all of the above

6 / 50

6. For any channel section, the specific energy increase with

a) decreases in depth of super critical flow

b) increases in depth of super critical flow

c) increases in depth of sub critical flow

d) none of the above

7 / 50

7. Specific weight of liquid

a) remains constant at every place

b) does not remain constant at every place

c) varies from place to place

d) does not vary on any other planet except earth

8 / 50

8. *The wetted perimeter of a channel is given by

a) 4.75Q^2

b) 4.75Q

c) 4.75√Q

d) none of the above

9 / 50

9. *Hydraulic gradient line (H.G.L.) represents the sum of

a) pressure head and kinetic head

b) kinetic head and datum head

c) pressure head, kinetic head, and datum head

d) pressure head and datum head

10 / 50

10. The most economical section of a circular channel for the maximum discharge is when

a) depth of water = 0.95 diameter of the circular section

b) hydraulic mean depth = 0.286 diameter of the circular section

c) wetted perimeter = 2.6 diameters of the circular section

d) all of the above

11 / 50

11. *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

12 / 50

12. *The condition for the maximum velocity and discharge is given by (closed flow)

a) 0.81D & 0.95D

b) 0.82D & 0.94D

c) 0.83D & 0.93D

d) 0.84D & 0.92D

13 / 50

13. Which of the following quantities are dimensionless?

a) surface tension

b) specific weight

c) angular velocity

d) Mach number

14 / 50

14. *Orifice-meter is used to measure:

a) pressure at the point

b) discharge

c) average speed

d) velocity

15 / 50

15. If the total head of the nozzle of a pipe is 37.5m and the discharge is 1 cubic meter per second, then the power generated is

a) 500 HP

b) 550 HP

c) 400 HP

d) 450 HP

16 / 50

16. *The discharge through a rectangular channel is maximum when

a) m = d/2

b) d=b/2

c) m=2d

d) both (a) and (b) above

17 / 50

17. Flow in pipes is turbulent if the Reynolds number is

a) less than 2100

b) more than 3000

c) between 2100 and 3000

d) none of the above

18 / 50

18. 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

19 / 50

19. "Manning's formula is used for

a) flow in open channels

b) head loss due to friction in open channels

c) head loss due to friction in pipes flowing full

d) flow in pipes

20 / 50

20. Pick up the correct statement from the following

a) total energy gradient is the graphical representation of the total head at any section of a pipeline

b) vertical distance between the total energy line and hydraulic grade line is equal to the velocity head

c) vertical distance between the total energy line and total energy gradient represents the loss of head

d) all of the above

21 / 50

21. *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

22 / 50

22. If H is the height of the liquid above the sill, the effect of end contraction on each side, according to Francis' formula, is

a) 0.1H

b) 0.2H

c) 0.3H

d) 0.4H

23 / 50

23. *The specific weight of water 1000 kg/m^3

a) at normal pressure of 760 mm

b) at 4°C temperature

c) at mean sea level

d) all of the above

24 / 50

24. For a circular channel, the wetted perimeter is given by (where θ=half the angle subtended by the water at the center and R= radius of circular channel)

a) 2Rθ

b) 3Rθ

c) 4Rθ

d) all of the above

25 / 50

25. Discharge over an ogee weir remains the same as that of

a) sharp-crested weir

b) triangular weir

c) Cipolleti weir

d) drowned weir

26 / 50

26. *The hydraulic ram is a device

a) for lifting water without an electric motor

b) for accelerating water flow

c) for lifting heavy loads

d) none of the above

27 / 50

27. Super-critical flow occurs in

a) normal slope

b) mild slope

c) steep slope

d) all of the above

28 / 50

28. *If a pitot tube is placed with its nose facing downstream, the liquid

a) does not rise in the tube

b) rises in the tube to a height √v^2/sg

c) falls in the tube to a depth √v^2/2g

d) none of the above

29 / 50

29. *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

30 / 50

30. A ideal fluid

a) is frictionless and incompressible

b) obey Newton's law of viscosity

c) is similar to gas

d) is very viscous

31 / 50

31. 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

32 / 50

32. *Barometers are used to measure

a) pressure in water channels, pipes, etc.

b) difference in pressure at two points

c) atmospheric pressure

d) very low pressure

33 / 50

33. *Molecules of fluids get attracted due to

a) capillary action

b) surface tension

c) adhesion

d) cohesion

34 / 50

34. The thickness of a sharp-crested weir is kept less than

a) one-third of the height of water on the sill

b) one-half of the height of water on the sill

c) two-thirds of the height of water on the sill

d) four-thirds of the height of water on the sill

35 / 50

35. *The discharge passing through the crest having a length of 1.25m, a height of the flow of water 0.25m, and C_d = 0.035 is

a) 0.0116 cm³/sec

b) 0.116 cm³/sec

c) 0.0160 cm³/sec

d) 0.00116 cm³/sec

36 / 50

36. *Cavitations is caused by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

37 / 50

37. *The floating method is used for the measurement of

a) discharge

b) head

c) pressure

d) none of the above

38 / 50

38. The viscosity of gases varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

39 / 50

39. *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

40 / 50

40. *Losses are more in

a) laminar flow

b) critical flow

c) turbulent flow

d) transition flow

41 / 50

41. 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

42 / 50

42. *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

43 / 50

43. The capillary rise or fall of the liquid is given by

a) h = σ cos θ / 4ρgd

b) h = 4σ cos θ / ρgd

c) h = 8σ cos θ / ρgd

d) none of the above

44 / 50

44. At the vena contracta, the jet has the minimum cross-sectional area, and so the velocity of the liquid at this section will be

a) minimum

b) maximum

c) average

d) critical

45 / 50

45. *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

46 / 50

46. *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

47 / 50

47. Crest of a weir is lower than d/s water level

a) submerged weir

b) Cipolletti weir

c) triangular weir

d) sharp-crested weir

48 / 50

48. As per our convenience which one is correct with respect to the dimensionless number?

a) WIS-MIE-RIV-FIG-EIP

b) WIE-MIS-RIV-FIG-IEP

c) MIE-WIS-RIG-FIV-PIE

d) WIG-MIS-RIE-FIV-IPE

49 / 50

49. 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

50 / 50

50. *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

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