Hydraulics Online Test - Paper 3

Created by

Vikash chaudhary

This is a FREE online test. Beware of scammers who ask for money to attend this test.

Get fresh, new questions in each attempt.

Total Questions: 50
Time Allotted: 50 minutes
Passing Score: 70%
Randomization: Yes
Certificate: Yes
Do not refresh the page!
👍 All the best!

1 / 50

1. 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

2 / 50

2. 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

3 / 50

3. 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

4 / 50

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

a) fittings

b) sudden increase in diameter

c) sudden decrease in diameter

d) friction

5 / 50

5. For the same specific force, the two depths at which the same discharge occurs are called

a) alternate depths

b) conjugate depths

c) critical depths

d) normal depths

6 / 50

6. 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

7 / 50

7. 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

8 / 50

8. *The pressure in pipe flow is normally

a) less than atmospheric pressure

b) equal to atmospheric pressure

c) more than atmospheric pressure

d) none of the above

9 / 50

9. *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

10 / 50

10. Super-critical flow occurs in

a) normal slope

b) mild slope

c) steep slope

d) all of the above

11 / 50

11. 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

12 / 50

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

a) plasticity

b) viscosity

c) compressibility

d) none of the above

13 / 50

13. *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

14 / 50

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

a) vein

b) nappe

c) sill

d) none of the above

15 / 50

15. One horsepower is equal to

a) 1 kW

b) 0.746 kW

c) 0.836 kW

d) 0.756 kW

16 / 50

16. *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

17 / 50

17. 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

18 / 50

18. 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

19 / 50

19. The viscosity of gases varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

20 / 50

20. *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

21 / 50

21. Open channel flow is

a) one in which the liquid is flowing in a conduit and has a free surface

b) one in which the liquid is flowing in a closed conduit running full

c) a covered channel running full

d) one in which the liquid is flowing in a conduit under pressure

22 / 50

22. *An ideal flow of a liquid obeys

a) continuity equation

b) Newton's second law of viscosity

c) Newton's second law of motion

d) dynamic viscosity

23 / 50

23. *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

24 / 50

24. The term z is known as

a) potential energy

b) pressure energy

c) potential energy per unit weight

d) none of the above

25 / 50

25. 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

26 / 50

26. 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

27 / 50

27. *In flow, the liquid particles may possess

a) potential energy

b) kinetic energy

c) pressure energy

d) all of the above

28 / 50

28. 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

29 / 50

29. *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

30 / 50

30. A siphon is used

a) to connect water reservoirs at different levels intervened by a hill

b) to supply water to a town from a higher level to a lower level

c) to fill up a tank with water at a higher level from a lower level

d) none of the above

31 / 50

31. *Piezometers 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

32 / 50

32. *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

33 / 50

33. 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

34 / 50

34. *Cipolletti weir is a trapezoidal weir having a side slope of

a) H:V::1:2

b) H:V::2:1

c) H:V::1:4

d) none of the above

35 / 50

35. Total pressure on the top of a closed cylindrical vessel completely filled with liquid is directly proportional to

a) radius

b) (radius)^2

c) (radius)^3

d) (radius)^4

36 / 50

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

a) more

b) less

c) equal

d) not defined

37 / 50

37. *Rotameter is used for measuring

a) density of fluids

b) value of fluids in a pipe

c) discharge of fluids

d) pressure in fluids

38 / 50

38. 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

39 / 50

39. 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

40 / 50

40. Gauge pressure is

a) absolute - atmosphere

b) absolute + atmosphere

c) atmospheric ± absolute

d) none of the above

41 / 50

41. 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

42 / 50

42. 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

43 / 50

43. An oil of specific gravity 0.7 and pressure 0.14 kgf/cm^2 will have the height of oil as

a) 70 cm of oil

b) 2 m of oil

c) 20 cm of oil

d) 80 cm of oil

44 / 50

44. In a venturimeter, the divergent cone is kept

a) shorter than the convergent cone

b) longer than the convergent cone

c) equal to the convergent cone

d) none of the above

45 / 50

45. *Back water curve is caused if there is a

a) friction head loss is more than the bed slope

b) obstruction due to weir in the channel

c) there is an increase in width of the channel

d) none of the above

46 / 50

46. 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

47 / 50

47. 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

48 / 50

48. *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

49 / 50

49. If the Froude number in open channel flow is equal to 1.0, the flow is called

a) critical flow

b) streaming flow

c) shooting flow

d) none of the above

50 / 50

50. The error 1% in measuring H will produce a

a) 1%

b) 1.5%

c) 2%

d) 2.5%

Please provide accurate information so we can send your Achievement Certificate by mail.

NameEmailPhone Number

Your score is

Please provide your feedback.

Thank you for your valuable feedback.

Buy Hydraulics MCQ PDF for Offline Study

Hydraulics Online Test – Paper 3

Please provide accurate information so we can send your Achievement Certificate by mail.

Related MCQs