Fluid Mechanics And Hydraulics
6 Questions
| Total Attempts: 417
Civil Engineering
Questions and Answers
- 1.The displacement thickness of a boundary layer is
- A.
The distance to the point where (v/V) = 0.99
- B.
The distance where the velocity 'v' is equal to the shear velocity V*, that is, where v=V*
- C.
The distance by which the main flow is to be shifted from the boundary to maintain the continuity equation
- D.
One half the actual thickness of the boundary layer
- 2.The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is
- A.
D>m>e
- B.
D>e>m
- C.
E>m>d
- D.
E>d>m
- 3.Drag force is a function of
- A.
Projected area of the body
- B.
Mass density of the fluid
- C.
Velocity of the body
- D.
The correct answer is A, B and C
- 4.Apart form inertia force, which of the following forces is most important in motion of submarines under water?
- A.
Viscous force
- B.
Gravity force
- C.
Compressive force
- D.
Surface tension force
- 5.A spillway model constructed to a scale of 1:4 gives a discharge of 5 m3/s. The discharge from the prototype would be
- A.
160 m3/s
- B.
640 m3/s
- C.
10 m3/s
- D.
20 m3/s
- 6.A river model is made to a length scale ratio of 1/100 and depth scale ratio of 1/16. A peak discharge of 25,600 m3/s in the river will be simulated in the model with a discharge of
- A.
10 cumec.
- B.
4 cumec.
- C.
1.6 cumec.
- D.
0.64 cumec.
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