Answer ALL Questions

PART A – (5 x 2 = 10 Marks)

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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