Fluid Mechanics (Chemical Perspective) – Multiple Choice Questions (MCQs)

1. 25. What is 'friction factor' (f)?

   • A. A dimensionless parameter used to quantify the frictional losses in pipe flow
   • B. A measure of fluid viscosity
   • C. A measure of pipe roughness
   • D. A measure of fluid velocity

2. 26. What is the 'Darcy-Weisbach equation' used for?

   • A. To calculate head loss due to friction in pipe flow
   • B. To calculate fluid velocity
   • C. To calculate fluid density
   • D. To calculate heat transfer

3. 27. What is 'major loss' in pipe flow?

   • A. Head loss due to friction along the length of the pipe
   • B. Head loss due to fittings and valves
   • C. Head loss due to changes in elevation
   • D. Head loss due to pumps

4. 28. What is the 'Moody diagram' used for?

   • A. To determine the friction factor for turbulent pipe flow
   • B. To determine fluid density
   • C. To determine fluid viscosity
   • D. To determine pipe diameter

5. 29. What is 'pump'?

   • A. A mechanical device used to increase the pressure of a fluid and move it from one point to another
   • B. A device for measuring pressure
   • C. A device for mixing fluids
   • D. A device for heating fluids

6. 30. What is 'net positive suction head' (NPSH)?

   • A. A measure of the pressure difference required to prevent cavitation in a pump
   • B. A measure of pump efficiency
   • C. A measure of fluid flow rate
   • D. A measure of pump power

7. 31. What is a 'centrifugal pump'?

   • A. A pump that uses a rotating impeller to impart velocity to the fluid
   • B. A pump that uses a reciprocating motion
   • C. A pump that uses positive displacement
   • D. A pump used only for gases

8. 32. What is 'fluidization'?

   • A. The process of transforming a bed of solid particles into a fluid-like state by passing a gas or liquid upwards through it
   • B. The process of liquefying a gas
   • C. The process of solidifying a liquid
   • D. The process of mixing two fluids

9. 33. What is 'minimum fluidization velocity'?

   • A. The minimum fluid velocity required to fluidize a bed of particles
   • B. The maximum fluid velocity in a fluidized bed
   • C. The velocity at which particles start to settle
   • D. The velocity that causes channeling

10. 34. What is 'pressure drop' in a packed bed?

    • A. The reduction in fluid pressure as it flows through the packed bed
    • B. The increase in fluid pressure
    • C. The temperature change
    • D. The reaction rate

11. 35. What is the 'Ergun equation' used for?

    • A. To calculate pressure drop in packed beds
    • B. To calculate fluid velocity in pipes
    • C. To calculate heat transfer
    • D. To calculate mass transfer

12. 36. What is 'settling velocity'?

    • A. The terminal velocity at which a particle falls through a fluid under gravity
    • B. The velocity of a fluid in a pipe
    • C. The velocity of a pump
    • D. The velocity of a chemical reaction