In this blog, I am going to share 15 important questions for fluid mechanics
Q1. If there is no spillage of water in force vortex motion then the rise of liquid level at the end is equal toAns-fall of liquid level
Q2. What is the height of the parabola in the free vortex?
Ans- (ωR)^2 /2g
Q3. What is vortex motion?
Ans-motion of fluid in a curved path is known as vortex motion
Q4. Equation of forced vortex motion
Ans-V =rω
Q5 what is forced vortex motion
Ans-in forced vortex motion the fluid moves in curved path under the action of external agency that is torque.
Ex. Liquid in a container when rotated, motion of fluid in the impeller of centrifugal pump
Q6. What is free vortex motion
Ans-free vortex motion the fluid moves in a curved path ,not under the the influence of external agency but due to to internal action of of load
Ex. Flow of fluid in a pipe bend, motion of flood in in the Diffuser of centrifugal pump, whirlpool,wash basin.
Q7. Free water vortex motion is irrotational or rotational
Ans- Irrotational motion
Q8 force vortex motion is rotational or irrotational
Ans-rotational
Q9. A potential function
Ans-describe the flow, if it is irrotational
Q10. Flow in a pipe takes place from
Ans-higher energy to lower energy
Q11. Velocity at a point in a pipe flow may be measured by installing
Ans--pitot tube at that point
Q12. When the depth of immersion of a plane surface is increased the centre of pressure will
Ans- come closer to centroid
Q13. What is Reynolds number
Ans-It is the ratio of inertia force to viscous force
Q14. The pressure at a point is equal in all direction
Ans-when the fluid is at rest
Q15. An object weighing 100N in air was found to weight 75N in when fully submerged in water then the relative density of the object
Ans-4