Mechanical Engineering - Hydraulics and Fluid Mechanics
Exercise :: Hydraulics and Fluid Mechanics - Section 3
1.
In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.
A.
equal to B.
one-fourth C.
one-third D.
one-half
Answer: Option B
Explanation:
2.
Viscous force is the __________ of shear stress due to viscosity and cross-sectionar area of flow.
Answer: Option C
Explanation:
3.
The density of air is same at different heights.
Answer: Option B
Explanation:
4.
The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)
Answer: Option C
Explanation:
5.
A body floating in a liquid is said to be in a stable equilibrium, if its metacentre coincides with its centre of gravity.
Answer: Option B
Explanation: