A. free vortex motion
B. forced vortex motion
C. free vortex at center and forced vortex outside
D. forced vortex at center and free vortex outside
✅ The correct answer is option D.
Fluid Mechanics MCQs
In a Sutro weir, the discharge is proportional to________________?
A. H1/2
B. H3/2
C. H5/2
D. H
✅ The correct answer is option D.
The major loss of energy in long pipes is due to_______________?
A. sudden enlargement
B. sudden contraction
C. gradual contraction or enlargement
D. friction
✅ The correct answer is option D.
The discharge over a broad crested weir is maximum when the depth of flow is_______________?
A. H/3
B. H/2
C. 2 H/5
D. 2 H/3
✅ The correct answer is option D.
For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be_________________?
A. 300
B. 337.5
C. 600
D. 675
✅ The correct answer is option D.
If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will________________?
A. rise until its weight equals the buoyant force
B. tend to move downward and it may finally sink
C. float
D. none of the above
✅ The correct answer is option B.
A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be________________?
A. 1 m
B. 10m
C. 100m
D. none of the above
✅ The correct answer is option C.
The maximum thickness of boundary layer in a pipe of radius r is____________________?
A. 0
B. r/2
C. r
D. 2r
✅ The correct answer is option C.
The hydraulic grade line is_________________?
A. always above the centre line of pipe
B. never above the energy grade line
C. always sloping downward in the direction of flow
D. all of the above
✅ The correct answer is option B.
A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of________________?
A. 3.75 m
B. 4.0 m
C. 4.2m
D. 4.5m
✅ The correct answer is option C.