2. The specific volume of a liquid is the reciprocal of
Correct : B. mass density
3. Which one of the following is the unit of specific weight?
Correct : A. n = m3
4. [p] = [m]/[v] = [m] /[L3] = [ML-3].
Correct : D. [m0 l0 t0].
5. Which one of the following is the
Correct : B. [m-1 l3 t0].
6. the relation between their specific volumes v1 and v2?
Correct : B. v1 < v2
7. mark of one litre and weighed. The weight of the liquid is found to be 6.5 N. The specific weight of the liquid will be
Correct : A. 6:5 kn = m3
8. A beaker is filled with a liquid up to the mark of one litre and weighed. The weight of the liquid is found to be 6.5 N. The specific gravity of the liquid will be
Correct : A. 0.65
9. mark of one litre and weighed. The weight of the liquid is found to be 6.5 N. The specific volume of the liquid will be
Correct : B. 1:5 l =kg
10. continuity equation is
Correct : A. mass conservation
11. equation of mass conservation into the conservative integral form, which of these theorems is used?
Correct : D. gauss divergence theorem
12. ρV→. dS→ is positive when
Correct : A. the mass flow is outward
13. Hydraulic gradient line takes into consideration
Correct : B. potential and pressure heads only
14. Which of the following is true?
Correct : A. egl always drops in the direction of c
15. Which of the following is true?
Correct : D. hgl may or may not in the direction of flow
16. Which of the following is true?
Correct : A. hgl will never be above egl
17. The slope of HGL will be
Correct : C. equal than that of egl for a pipe of uniform cross-section
18. For a nozzle, the vertical intercept between EGL and HGL
Correct : A. increases
19. between EGL and HGL
Correct : B. decreases
20. Which of the following is true?
Correct : D. the slope of egl will always be independent of that of the axis of the pipe
21. the pressure vary with the length of the pipe?
Correct : A. linearly
22. When a problem states “The velocity of the water flow in a pipe is 20 m/s”, which of the following velocities is it talking about?
Correct : B. average velocity
23. Which of the factors primarily decide whether the flow in a circular pipe is laminar or turbulent?
Correct : D. the reynolds number
24. How is Reynolds number defined as?
Correct : D. ratio of inertia force to viscous force
25. A circular pipe of radius 7 cm is used for water flow transmission. This pipe is moulded into another pipe with a square cross-section keeping the length same. (Ignore the thickness of the pipe). Calculate the hydraulic diameter of the moulded pipe. (Take π = 22/7).
Correct : A. 11 cm
26. The Reynolds number is found out for a flow in a circular pipe. This circular pipe is moulded into a square pipe, keeping length of the pipe same. Ignore the thickness of the pipe. The Reynolds number changes by
Correct : B. 57% increase
27. The flow through a circular pipe is laminar. Now, the fluid through the pipe is replaced with a more viscous fluid and passed through the pipe again with the same velocity. What can we say about the nature of this flow?
Correct : C. the flow will remain laminar
28. What can be the maximum diameter of the pipe for the water flow of velocity 1 m/s (ν = 10-6) to be laminar in nature? Assume Lower critical Reynolds number to be 2100.
Correct : A. 2.1 mm
29. Which of the following flows have the highest critical Reynolds number (lower)?
Correct : A. flow in a pipe
30. The flow separation occurs when the fluid travels away from the
Correct : C. adverse pressure gradient
31. The swirl caused due to eddies are called as
Correct : A. vortices
32. Eddy viscosity is a turbulent transfer of
Correct : C. momentum
33. Which among the following is a device that converts a laminar flow into a turbulent flow?
Correct : C. turbulator
34. Boundary layer separation does not undergo detachment.
Correct : B. false
35. With the boundary layer separation, displacement thickness
Correct : A. increases
36. automatic control scheme during the fluid flow?
Correct : D. pilot static tube
37. What is D’Alembert’s Paradox?
Correct : B. drag force= 0
38. The steady- state flow must satisfy
Correct : A. kirchhoff’s law
39. depend on the friction factor?
Correct : D. weight
40. How do we calculate losses for a larger range of Reynolds number?
Correct : A. moody chart
41. Darcy- Weisbach equation gives relation between
Correct : C. head loss and pressure loss
42. Which among the following is formula for friction factor of circular pipes?
Correct : B. 64/re
43. Loss of head due to friction is
Correct : C. inversely proportional to hydraulic radius
44. The formula for hydraulic diameter is
Correct : A. 4a/p
45. What are the reasons for minor head loses in a pipe?
Correct : C. valves and bends
46. What happens to the head loss when the flow rate is doubled?
Correct : D. four times
47. Relative roughness is
Correct : A. ϵ/d
48. pipes can take up
Correct : A. pipes of different diameters
49. What is the total loss developed in a series of pipes?
Correct : C. sum of local losses plus the losses in each pipe
50. The total head loss for the system is equal to
Correct : D. height difference of reservoirs
51. that is developed in the pipe?
Correct : D. liquid velocity
52. Which among the following is the correct formula for head loss?
Correct : A. z1-z2
53. If the two reservoirs are kept at the same level, the head loss is
Correct : B. zero
54. How do we determine the total discharge through parallel pipes?
Correct : A. add them.
55. The pipe diameter is
Correct : B. directly proportional to mass flow rate
56. Define Viscosity.
Correct : C. resistance to flow of fluid
57. Coefficient of friction of a laminar flow is
Correct : C. 16/re
58. TOPIC 3.1 NEED FOR DIMENSIONAL ANALYSIS - METHODS OF DIMENSIONAL ANALYSIS
Correct : C. chemistry
59. Quantum physics deals with macroscopic phenomena.
Correct : B. false
60. Which of the following uses electromagnetic waves?
Correct : A. radio
61. Which is the universal attractive force?
Correct : D. gravitational force
62. Gravitational force is the weakest force in nature.
Correct : A. true
63. Which of the following is an example of electromagnetic force?
Correct : D. compression of spring
64. Why is climbing a lamp post harder than climbing up a tree?
Correct : A. because of parallel friction force
65. Gravitational force, despite being a weak force, governs the large scale motion.
Correct : A. true
66. When a body is falling freely under gravity, the total mechanical energy remains constant because of which of the following?
Correct : A. law of conservation of energy
67. What happens when a bullet is fired from a rifle?
Correct : C. rifle gives backward kick
68. Similitude is a concept applicable to the testing of
Correct : C. engineering models
69. Which among the following is the main application for Similitude?
Correct : C. hydraulics
70. A model of with same shape is
Correct : A. geometric similarity
71. Which among the following have similar fluid streamlines?
Correct : B. kinematic similarity
72. Which among the following have the same forces acting on them?
Correct : C. dynamic similarity
73. All the parameters in a similitude are described using
Correct : A. continuum mechanics
74. Physical similitude has exactly the same geometric shape of the prototype.
Correct : A. true
75. Which among the following is a standard scale for a similitude?
Correct : C. 1:25
76. In similitude, Fapplication=Fmodel*3.44
Correct : A. true
77. spread is called
Correct : B. diffusivity
78. Which among the following is the standard symbol for Archimedes number?
Correct : C. ar
79. symbol for Atwood number?
Correct : A. a
80. Which among the following is the standard symbol for Blake number?
Correct : B. ba
81. Which among the following is the standard symbol for Darcy friction factor?
Correct : B. fd
82. Fanning friction factor is
Correct : A. 0.25 times darcy friction factor
83. symbol for Froude number?
Correct : C. fr
84. Which among the following is the formula for Knudsen number?
Correct : A. λ⁄l
85. utilization of
Correct : C. work
86. fluid mechanics deals with heat transfer. It is
Correct : B. forward direction
87. The force analysis on a curved vane is understood using
Correct : A. velocity triangles
88. Jet propulsion works on the principle of
Correct : C. newton’s third law
89. How is absolute velocity at inlet denoted?
Correct : B. v1
90. The relative velocity is obtained by the equation
Correct : A. u – v1
91. If the friction is neglected, then
Correct : C. vr1 = vr2
92. If the pressure remains a constant, then
Correct : C. vr1 = vr2
93. from the sea can be taken by the pump.
Correct : A. true
94. Jet propulsion of ship is less efficient than screw propeller due to