61. Manometers measure the __________ pressure.
Vacuum as well as the atmospheric
Difference in
Absolute
Gage
✅ The correct answer is option B.
Fluid Mechanics MCQs
62. Pick out the wrong statement about cavitation.
Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation
Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities
Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise
Large scale cavitation can not damage pipeline, restrict fluid flow and damage steam turbine blades
✅ The correct answer is option D.
63. Which of the following factors does not contribute to the pressure drop in a pipeline ?
Velocity of fluid
Size of pipe
Length of pipe and number of bends
None of these
✅ The correct answer is option D.
64. One horsepower is equal to
550 lbf.ft/second
550 kgf.m/second
Both A and B
550 lbf.ft./hr
✅ The correct answer is option A.
65. Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.)
√d
d1/3
d2
d2/3
✅ The correct answer is option A.
66. Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.
For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the venturimeter
Discharge of fluid through a venturimeter depends upon the gage difference irrespective of the orientation of venturimeter
Venturimeter occupies less space than an orificemeter
Venturimeter incurs less power loss compared to an equivalent orificemeter
✅ The correct answer is option C.
67. Power loss in an orificemeter is __________ that in a venturimeter.
Less than
Same as
More than
Data insufficient, cannot be predicted
✅ The correct answer is option C.
68. Transition from laminar flow to turbulent flow is aided by the
Surface roughness and curvature (i.e.sharp corners)
Vibration
Pressure gradient and the compressibility of the flowing medium
All of the above
✅ The correct answer is option D.
69. A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is __________ litres.
600
660
1.1
60
✅ The correct answer is option B.
70. Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as
V1.8
V-0.2
V2.7
V2
✅ The correct answer is option D.