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fluid mech 1
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 101
 Answered
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Question 1 of 101
1. Question
1 pointsShear stress in a turbulent flow is given by the formula τ = η (du / dy) Where η (eta) is
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Question 2 of 101
2. Question
1 pointsMagnitude of eddy viscosity for laminar flow is
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Question 3 of 101
3. Question
1 pointsKinematic eddy viscosity (ε) is the ratio of
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Question 4 of 101
4. Question
1 pointsFriction factor for laminar flow is given by
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Incorrect

Question 5 of 101
5. Question
1 pointsWhat is temporal mean velocity?
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Question 6 of 101
6. Question
1 pointsThe friction factor in fluid flowing through pipe depends upon
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Incorrect

Question 7 of 101
7. Question
1 pointsWhat is the effect of change in Reynold’s number on friction factor in turbulent flow?
Correct
Incorrect

Question 8 of 101
8. Question
1 pointsWhat is the formula for determining the size of equivalent pipe for two pipes of lengths L^{[1]}^{[2]}, L_{2} and diameters d_{1}, d_{2} respectively?
Correct
Incorrect

Question 9 of 101
9. Question
1 pointsWhich of the following is a dimensionless equation?
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Question 10 of 101
10. Question
1 pointsWhich of the following number is applicable in open hydraulic structure such as spillways, where gravitational force is predominant?
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Question 11 of 101
11. Question
1 pointsSquare root of the ratio of inertia force to elastic force is called as
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Question 12 of 101
12. Question
1 pointsBoundary layer thickness is the distance from the boundary to the point where velocity of the fluid is
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Question 13 of 101
13. Question
1 pointsThe component of the total force exerted by fluid on a body in the direction parallel to the direction of motion is called as
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Question 14 of 101
14. Question
1 pointsThe sum of components of shear forces in the direction of flow of fluid is called
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Question 15 of 101
15. Question
1 pointsThe body whose surface does not coincide with the streamline when places in a flow is called as
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Question 16 of 101
16. Question
1 pointsThe body whose surface does not coincide with the streamline when places in a flow is called as
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Question 17 of 101
17. Question
1 pointsWhich type of body is an airfoil?
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Question 18 of 101
18. Question
1 pointsBulk modulus is the ratio of
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Question 19 of 101
19. Question
1 pointsWhen is a liquid said to be not in a boiling or vaporized state?
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Question 20 of 101
20. Question
1 pointsOne litre of a certain fluid weighs 8N. What is its specific volume?
 2.03 x 10^{– 3} m^{3}/kg
 20.3 x 10^{– 3} m^{3}/kg
 12.3 x 10^{– 3} m^{3}/kg
 1.23 x 10^{– 3} m^{3}/kg
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Incorrect

Question 21 of 101
21. Question
1 pointsWhat is the correct formula for absolute pressure?
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Question 22 of 101
22. Question
1 pointsAccording to Archimede’s principle, if a body is immersed partially or fully in a fluid then the buoyancy force is _______ the weight of fluid displaced by the body.
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Question 23 of 101
23. Question
1 pointsThe unit of physical quantity which does not depend on the unit of any other physical quantity is called as
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Question 24 of 101
24. Question
1 pointsWhich of the following is not a primary quantity?
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Question 25 of 101
25. Question
1 pointsWhat are the dimensions of force?
 [M L T^{ – 2 }]
 [M L T ^{– 1 }]
 [M L 2 T – 2 ]
 [M L^{ 2 }T ^{2 }]
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Incorrect

Question 26 of 101
26. Question
1 pointsWhich of the following quantities has the dimensions [M^{0} L^{0} T ^{0}]
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Question 27 of 101
27. Question
1 pointsHow is the intensity of shear stresses over the boundary layer?
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Question 28 of 101
28. Question
1 pointsThe velocity gradients over the boundary layer are
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Question 29 of 101
29. Question
1 pointsWhat is the effect of free stream velocity on thickness of boundary layer?
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Question 30 of 101
30. Question
1 pointsIf viscosity of fluid is more, the thickness of boundary layer is
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Question 31 of 101
31. Question
1 pointsThe region in the turbulent boundary layer zone, adjacent to the solid surface of the plate is called as
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Question 32 of 101
32. Question
1 pointsNewton’s law of viscosity states that
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Question 33 of 101
33. Question
1 pointsWhat is an ideal fluid?
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Question 34 of 101
34. Question
1 pointsThe below diagram is a graph of change in shear stress with respect to velocity gradient in a fluid. What is a type of the fluid?
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Question 35 of 101
35. Question
1 pointsThe fluid will rise in capillary when the capillary is placed in fluid, if
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Question 36 of 101
36. Question
1 pointsWhen the angle between surface tension with the liquid (θ) is greater than 90^{o}, the liquid becomes
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Question 37 of 101
37. Question
1 pointsIf stream function (Ψ) satisfies the Laplace equation, it is a possible case of
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Question 38 of 101
38. Question
1 pointsWhich acceleration has a nonzero value in uniform flow?
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Question 39 of 101
39. Question
1 pointsViscous forces are not present in
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Question 40 of 101
40. Question
1 pointsThe component of acceleration due to change in the direction of velocity vector is called as
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Question 41 of 101
41. Question
1 pointsBlood circulation through arteries is
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Question 42 of 101
42. Question
1 pointsWhat is the correct formula for Euler’s equation of motion?
Where,
ρ = density of the fluid p = pressure force g = acceleration due to gravity v = velocity of the fluid
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Question 43 of 101
43. Question
1 pointsWhich of the following sentences are true for Bernoulli’s equation?
 Bernoulli’s principle is applicable to ideal incompressible fluid
 The gravity force and pressure forces are only considered in Bernoulli’s principle
 The flow of fluid is rotational for Bernoulli’s principle
 The heat transfer into or out of fluid should be zero to apply Bernoulli’s principle
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Question 44 of 101
44. Question
1 pointsWhich of the following devices does not use Bernoulli’s equation as its working principle?
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Question 45 of 101
45. Question
1 pointsVenturimeter consists of short converging conical tube which has a total inclination angle of
 11 ± 1^{o}
 21 ± 1^{o}
 30 ± 1^{o}
 60 ± 1^{o}
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Incorrect

Question 46 of 101
46. Question
1 pointsThe cylindrical portion of short length, which connects converging and diverging section of venturimeter, is called as
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Question 47 of 101
47. Question
1 pointsShear stress in static fluid is
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Question 48 of 101
48. Question
1 pointsWhich branch of fluid mechanics deals with translation, rotation and deformation of the fluid element without considering the force and energy causing such motion is called as
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Question 49 of 101
49. Question
1 pointsInter molecular cohesive force in the fluids is
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Question 50 of 101
50. Question
1 pointsThe specific weight of the fluid depends upon
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Question 51 of 101
51. Question
1 pointsWhich property of the fluid offers resistance to deformation under the action of shear force?
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Question 52 of 101
52. Question
1 pointsIn which method of describing fluid motion, the observer remains stationary and observes changes in the fluid parameters at a particular point only?
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Question 53 of 101
53. Question
1 pointsThe rate of increase of velocity with respect to change in the position of fluid particle in a flow field is called as
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Question 54 of 101
54. Question
1 pointsThe actual path followed by a fluid particle as it moves during a period of time, is called as
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Question 55 of 101
55. Question
1 pointsThe imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at the point, is called as
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Question 56 of 101
56. Question
1 pointsCorrect
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Question 57 of 101
57. Question
1 pointsThe study of force which produces motion in a fluid is called as
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Question 58 of 101
58. Question
1 pointsWhich of the following forces generally act on fluid while considering fluid dynamics?
 Viscous force
 Pressure force
 Gravity force
 Turbulent force
 Compressibility force
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Question 59 of 101
59. Question
1 pointsThe net force of an ideal flow is equal to the sum of nonzero values of
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Question 60 of 101
60. Question
1 pointsWhen the net force acting on a fluid is the sum of only gravity force, pressure force and viscous force, the equation is called as
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Question 61 of 101
61. Question
1 pointsIn a steady, ideal flow of an incompressible fluid, total energy at any point of the fluid is always constant. This theorem is known as
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Question 62 of 101
62. Question
1 pointsThe flow of fluid will be laminar when,
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Question 63 of 101
63. Question
1 pointsHow should be the viscosity of the flowing fluid for laminar flow?
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Question 64 of 101
64. Question
1 pointsBelow diagram shows the velocity distribution of fluid flow through a pipe. Flow is laminar.
What is the ratio of maximum velocity to average velocity?
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Question 65 of 101
65. Question
1 pointsCoefficient of friction for laminar flow is given as
Where, Re = Reynold’s number
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Question 66 of 101
66. Question
1 pointsWhat is the ratio of maximum velocity to average velocity, when the fluid is passing through two parallel plates and flow is laminar?
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Question 67 of 101
67. Question
1 pointsThe head loss through fluid flowing pipe due to friction is
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Question 68 of 101
68. Question
1 pointsWhat is DarcyWeisbach formula for heat loss due to friction?
Where, f = Darcy’s coefficient of friction
 h_{f} = (f l V^{2}) / (g d)
 h_{f} = (f l V^{2}) / (2 g d)
 h_{f} = (4 f l V^{2}) / (2 g d)
 h_{f} = (16 f l V^{2}) / (2 g d)
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Question 69 of 101
69. Question
1 pointsMinor losses occur due to
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Question 70 of 101
70. Question
1 pointsMinor losses do not make any serious effect in
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Question 71 of 101
71. Question
1 pointsWhat is the correct formula for loss at the exit of a pipe?
 h_{L} = 0.5 (V^{2} / 2g)
 h_{L} = (V^{2} / 2g)
 h_{L} = (2 V^{2} / g)
 h_{L} = (4 V^{2} / g)
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Question 72 of 101
72. Question
1 pointsFree air is the air at
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Question 73 of 101
73. Question
1 pointsStandard air is the air at
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Question 74 of 101
74. Question
1 points1 m of air at atmospheric condition weighs approximately
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Question 75 of 101
75. Question
1 pointsAdiabatic compression is one in which
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Question 76 of 101
76. Question
1 pointsThe capacity of a compressor is 5 m /mih. 5 m /min refers to
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Question 77 of 101
77. Question
1 pointsThe overall isothermal eiffciency of compressor is defined as the ratio of
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Question 78 of 101
78. Question
1 pointsThe most efficient method of compressing air is to compress it
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Question 79 of 101
79. Question
1 pointsMaximum work is done in compressing air when the compression is
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Question 80 of 101
80. Question
1 pointsThe pressure and temperature conditions of air at the suction of compressor are
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Question 81 of 101
81. Question
1 pointsIsothermal compression effeicency can be attained by running the compressor
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Question 82 of 101
82. Question
1 pointsThe compressor capacity with decrease in suction temperature
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Question 83 of 101
83. Question
1 pointsIsothermal compression efficiency, even when running at high speed, can be approached by using
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Question 84 of 101
84. Question
1 pointsCompression efficiency is compared against
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Question 85 of 101
85. Question
1 pointsAeroplanes employ following type of compressor
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Question 86 of 101
86. Question
1 pointsInter cooling in compressors
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Question 87 of 101
87. Question
1 pointsAn ideal air compressor cycle without clearance on pv diagram can be represented by following processes
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Question 88 of 101
88. Question
1 pointsAn ideal air compressor cycle with clearance on pv diagram can be represented by following processes
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Question 89 of 101
89. Question
1 pointsThe work done per unit mass of air in compression will’be least when n is equal to
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Question 90 of 101
90. Question
1 pointsIsothermal compression though most efficient, but is not practicable because
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Question 91 of 101
91. Question
1 pointsRatio of indicated H.P. and brake H.P. is known as
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Question 92 of 101
92. Question
1 pointsThe ratio of work doen per cycle to the swept volume in case of compressor is called
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Question 93 of 101
93. Question
1 pointsCylinder clearance in a compressor should be
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Question 94 of 101
94. Question
1 pointsRatio of compression is the ratio of
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Question 95 of 101
95. Question
1 pointsclearance volume in actual reciprocating compressors is essential
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Question 96 of 101
96. Question
1 pointsThe net work input required for compressor with increase in clearance volume
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Question 97 of 101
97. Question
1 pointsRatio of indicated h.p. to shaft h.p. in known as
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Question 98 of 101
98. Question
1 pointsVolumetric efficiency is
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Question 99 of 101
99. Question
1 pointsVolumetric efficiency of air compressors is of the order of
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Question 100 of 101
100. Question
1 pointsVolumetric efficiency of a compressor with clearance volume
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Question 101 of 101
101. Question
1 pointsVolumetric efficiency of a compressor without clearance volume
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