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 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

3 / 50

3. If the Froude number in open channel flow is less than 1.0, the flow is called

a) critical flow

b) super-critical flow

c) sub-critical flow

d) none of the above

4 / 50

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

a) adhesion

b) cohesion

c) corrosion

d) fusion

5 / 50

5. 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

6 / 50

6. *Molecules of fluids get attracted due to

a) capillary action

b) surface tension

c) adhesion

d) cohesion

7 / 50

7. 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

8 / 50

8. 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

9 / 50

9. Head loss due to friction in a pipe is given by the Darcy-Weisbach equation

a) h_f = 4fLV^2/2gd

b) h_f = fLV^2/2gd

c) h_f = 0.5V^2 / 2g

d) h_f = (v_1-v_2)^2 / 2g

10 / 50

10. *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

11 / 50

11. The basic head loss in a long pipe is:

a) fittings

b) sudden increase in diameter

c) sudden decrease in diameter

d) friction

12 / 50

12. Rotation is defined as the movement of a fluid element in such a way that both of its axes rotate in...

a) the same direction

b) different directions

c) both of the above

d) none of the above

13 / 50

13. 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

14 / 50

14. The inlet length of a venturimeter

a) is equal to the outlet length

b) is more than the outlet length

c) is less than the outlet length

d) none of the above

15 / 50

15. *Stoke is the unit of

a) surface tension

b) viscosity

c) kinematic viscosity

d) none of the above

16 / 50

16. 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

17 / 50

17. The viscosity of liquids varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

18 / 50

18. *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

19 / 50

19. Falling drops of water become spheres due to

a) adhesion

b) cohesion

c) surface tension

d) viscosity

20 / 50

20. 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

21 / 50

21. 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%

22 / 50

22. *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

23 / 50

23. For uniform flow in the channel

a) the total energy line, hydraulic gradient line, and the bottom of the channel are parallel

b) the total energy line and water surface are horizontal, while the bottom of the channel is inclined

c) total energy line, water surface, and the bottom of the channel are parallel

d) none of the above

24 / 50

24. In an open channel flow

a) the velocity distribution is symmetrical about the pipe axis

b) the maximum velocity occurs at a little distance below the water surface

c) flow cross-section is fixed

d) the flow takes place at the expense of hydraulic pressure

25 / 50

25. *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

26 / 50

26. *Cavitations is caused by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

27 / 50

27. *If a pitot tube is placed with its nose facing sideways, the liquid

a) rises in the tube

b) falls in the tube

c) neither rises nor falls in the tube

d) all of the above

28 / 50

28. Euler's number is the ratio of

a) inertia force to pressure force

b) pressure force to elastic force

c) elastic force to viscous force

d) viscous force to inertia force

29 / 50

29. *Head loss increases with

a) an increase in velocity

b) a decrease in velocity

c) a decrease in length of the pipe

d) an increase in the diameter of the pipe

30 / 50

30. Mass density of liquid (p) is given by

a) p = mass/volume

b) p = metric slug/m^2

c) p = kgsec^3/m^4

d) all of the above

31 / 50

31. *Pressure within a soap bubble is

a) equal to vapor pressure

b) less than external pressure

c) more than external pressure

d) equal to external pressure

32 / 50

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

a) fluid

b) liquid

c) solid

d) gas

33 / 50

33. In an inclined position, a venturimeter records

a) less reading

b) same reading

c) more reading

d) none of the above

34 / 50

34. *Surface float is used to measure

a) pressure

b) difference in pressure

c) viscosity of flow

d) none of the above

35 / 50

35. 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

36 / 50

36. *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

37 / 50

37. *The imaginary line joining each head of water is called

a) hydraulic gradient line

b) residual line

c) loss of gradient line

d) none of the above

38 / 50

38. 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

39 / 50

39. *Bernoulli's equation assumes that

a) fluid is non-viscous

b) fluid is homogeneous

c) flow is along the streamline

d) all of the above

40 / 50

40. 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

41 / 50

41. 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

42 / 50

42. *Losses are more in

a) laminar flow

b) critical flow

c) turbulent flow

d) transition flow

43 / 50

43. 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

44 / 50

44. *The equation of continuity of fluids is applicable only if

a) the flow is steady

b) the flow is in-compressible

c) the flow is one-dimensional

d) all of the above

45 / 50

45. 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

46 / 50

46. *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

47 / 50

47. 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

48 / 50

48. 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

49 / 50

49. 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

50 / 50

50. Weber number is the ratio of inertia force to

a) surface tension

b) gravitational force

c) elasticity

d) viscosity

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