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. A triangular notch is preferred to a rectangular notch because

a) only one reading is required

b) its formula is simple to remember

c) it gives more accurate results for low discharge (Q≤100m^3/sec)

d) it measures a wide range of flows accurately

2 / 50

2. The hydrostatic force exerted by 2 m deep water on the gate downstream is equal to

a) 40 kN

b) 10 kN

c) 20 kN

d) 30 kN

3 / 50

3. *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

4 / 50

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

a) kinetic head

b) pressure head

c) datum head

d) loss of head

5 / 50

5. Weber number is the ratio of inertia force to

a) surface tension

b) gravitational force

c) elasticity

d) viscosity

6 / 50

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

a) elevation energy

b) kinetic energy

c) pressure energy

d) none of the above

7 / 50

7. In an inclined position, a venturimeter records

a) less reading

b) same reading

c) more reading

d) none of the above

8 / 50

8. Hydraulic gradient line for an open flow channel is

a) below water level

b) same as water level

c) above water level

d) all of the above

9 / 50

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

a) silts

b) sands

c) clays

d) gravels

10 / 50

10. 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

11 / 50

11. The line joining the points to which the liquid rises in vertical piezometer tubes fitted at different cross-sections of a conduit is known as

a) hydraulic gradient

b) piezometric line

c) pressure grade line

d) all of the above

12 / 50

12. *The orifice used for low discharge is

a) rectangular

b) circular

c) square

d) triangular

13 / 50

13. In an open channel flow

a) the hydraulic gradient line is lower than the liquid surface

b) the hydraulic gradient line coincides with the liquid surface

c) the hydraulic gradient line is higher than the liquid surface

d) none of the above

14 / 50

14. *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

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 head of water representing in the case of HGL line is known as

a) static head

b) residual head

c) pressure head

d) all of the above

17 / 50

17. 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

18 / 50

18. The pressure less than atmospheric pressure is known as

a) suction pressure

b) vacuum pressure

c) negative pressure

d) all of the above

19 / 50

19. Velocity of flow may be determined using:

a) division of discharge to the area of flow

b) product of area and discharge divided by 100

c) product of wetted perimeter and hydraulic radius

d) all of the above

20 / 50

20. *Molecules of fluids get attracted due to

a) capillary action

b) surface tension

c) adhesion

d) cohesion

21 / 50

21. *Venturimeter is used to measure

a) rate of flow

b) velocity

c) depth of flow

d) all of the above

22 / 50

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

a) up

b) down

c) uplist

d) downlift

23 / 50

23. *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

24 / 50

24. 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

25 / 50

25. *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

26 / 50

26. *In flow, the liquid particles may possess

a) potential energy

b) kinetic energy

c) pressure energy

d) all of the above

27 / 50

27. If the Froude number in open channel flow is more than 1.0, the flow is called

a) critical flow

b) streaming flow

c) shooting flow

d) none of the above

28 / 50

28. Super-critical flow occurs in

a) normal slope

b) mild slope

c) steep slope

d) all of the above

29 / 50

29. 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

30 / 50

30. *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

31 / 50

31. 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

32 / 50

32. 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

33 / 50

33. *If the volume of a liquid weighing 2400 kg is 3 cubic meters, then 0.8 is its:

a) specific weight

b) specific mass

c) specific gravity

d) none of the above

34 / 50

34. *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

35 / 50

35. One horsepower is equal to

a) 1 kW

b) 0.746 kW

c) 0.836 kW

d) 0.756 kW

36 / 50

36. *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

37 / 50

37. Cavitations in flowing fluid occurs when

a) the total energy suddenly increases

b) the total energy suddenly decreases

c) the total energy is constant

d) none of the above

38 / 50

38. Gauge pressure is

a) absolute - atmosphere

b) absolute + atmosphere

c) atmospheric ± absolute

d) none of the above

39 / 50

39. Specific weight of sea water is more than that of pure water because of

a) dissolved air

b) dissolved salts

c) suspended matter

d) all of the above

40 / 50

40. *Orifice-meter is used to measure:

a) pressure at the point

b) discharge

c) average speed

d) velocity

41 / 50

41. *Losses are more in

a) laminar flow

b) critical flow

c) turbulent flow

d) transition flow

42 / 50

42. *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

43 / 50

43. The ratio of the mean velocity to the surface velocity in open channels is equal to

a) 0.55

b) 0.75

c) 0.88

d) 1.75

44 / 50

44. 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

45 / 50

45. *The term v^2/2g is known as

a) kinetic energy

b) pressure energy

c) kinetic energy per unit weight

d) none of the above

46 / 50

46. Chazy's formula is used to determine

a) head loss due to friction in pipes

b) velocity of flow in pipe

c) velocity of flow in channels

d) none of the above

47 / 50

47. The viscosity of liquids varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

48 / 50

48. Specific energy of a flowing fluid per unit weight is equal to

a) (v^2/2g) + h

b) (h^2/2g) + v

c) (v^2/2h) + g

d) (v^2/3g) + h

49 / 50

49. *The continuity equation deals with the law of conservation of

a) mass

b) momentum

c) energy

d) force

50 / 50

50. *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

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