Mechanics of Fluids Question Papers

1.Define continuum.
2.Differentiate between ideal fluid and real fluid.
3.Define surface tension.
4.Define kinematic viscosity.
5.Define specific gravity and specific volume.



PART - B [16+16+8 = 40 Marks]
6. Explain the type of fluids with neat sketch.
Answer all questions
7. a.i. Calculate the specific weight ,density and specific gravity of one litre of a
liquid which weighs 7N
ii. Derive the equation for Newton’s law of viscosity.

(Or)
b. Calculate the dynamic viscosity of an oil ,which is used for lubrication between a square
plate of size 0.8mx0.8m and an inclined plane with angle of inclination 30◦ . The weight of
the square plate is 30 kgf and it slides down the inclined plane with the uniform velocity of
0.3m/s . the thickness of oil film is 1.5mm
(16)
8. a.Two large plane surfaces are 2.4 cm apart . the space between the surfaces is filled with
glycerine . what force is required to drag a very thin plate of surface are 0.5m2 between the
two large plane surfaces at speed of 0.6m/sec
If i. the thin plate is in the middle of the two planes surfaces and
ii. The thin plane is at a distance of 0.8 cm from one of the plane surfaces.
Take dynamic viscosity of the glycerine =8.10x10-1 Ns/m2
(16)
(Or)
b.i, Derive the equation for the surface tension of liquid droplet and liquid jet. (8)
ii, Calculate the capillary rise in a glass tube of 2.5 mm diameter when immersed vertically
in water and mercury. Take the surface tension 0.0725 N/m for water and 0.52 N/m for
mercury in contact with air. The specific gravity of mercury is given as 13.6 and angle of
contact=130◦

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