1. Define the term fluid? How are fluid classified?
2. State the following fluid properties:
a) Pressure b) Temperature c) Density d) Internal energy e) Enthalpy f) Entropy g) Viscosity
3. What is the difference between dimension and unit? Give three examples for each term.
4. What is specific gravity? How is it related to density?
5. Define dynamic viscosity and kinematic viscosity. What is the effect of viscosity on the flight of aircraft?
6. Differentiate between : a) real fluid and ideal fluid b) Specific weight and specific volume of a fluid c) liquids and gases
7. Calculate the specific weight, density and specific gravity of one liter of a liquid which weighs 7N.
(Answer: Specific weight=7000KN/m3, density=713.5Kg/m3, specificgravity =0.7135)
8. State Newton's law of viscosity?
9. Define Newtonian fluid and Non-Newtonian fluid.
10. How does viscosity of fluid vary with temperature?
11. Write down the dimensions of the following variables: (a) Kinematic Viscosity (b) Specific weight; (c) specific enthalpy
12. Differentiate between Fluid statics and fluid dynamics
13. The velocity distribution over a flat plate is given by 
Where ‘u' |
= velocity in m/s |
y |
= distance from the plane boundary |
If the velocity of the fluid is 8 poise find the shear stress at the plane boundary and at y=0.15m from the plate.
Answer: (1.2 N/m2, 1.08N/m2)
14. What is vapour pressure? What is the affect of temperature on vapor pressure?
15. Why Mercury is an excellent fluid in a barometer?
16. What is bulk modulus of elasticity? How this term related to compressibility?
17. How does bulk modulus of elasticity of fluid vary with pressure and temperature?
18. State and explain the terms a) Surface tension b) Capillarity. Give three examples for each
19. What is the dimensional formula for surface tension?
20. Derive the equations for pressure inside a soap bubble, water droplet and a Liquid jet?
21. Define the terms adhesion and cohesion. What is the contribution of these properties to surface tension and capillarity action?
22. A U- tube is made up of two capillaries of bore 1mm and 2mm respectively. The tube is held vertically and partially filled with liquid of surface tension 0.05N/m and zero contact angle. Calculate the mass density of liquid, if the estimated difference in the level of two menisci is 12.5mm.
Answer: 816kg/m3