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

1. 61. How is the operating point of a pump-piping system determined?

   • A. By the intersection of the pump curve and the system curve
   • B. By the maximum point on the pump curve
   • C. By the minimum point on the system curve
   • D. By trial and error

2. 62. What is 'compressible flow'?

   • A. Flow where the density of the fluid changes significantly due to pressure variations
   • B. Flow where density is constant
   • C. Flow only for liquids
   • D. Flow only for solids

3. 63. What is 'incompressible flow'?

   • A. Flow where the density of the fluid remains essentially constant
   • B. Flow where density changes significantly
   • C. Flow only for gases
   • D. Flow only for high velocities

4. 64. What is the 'Mach number'?

   • A. The ratio of the speed of an object or fluid to the speed of sound in the fluid
   • B. A measure of fluid viscosity
   • C. A measure of fluid density
   • D. A measure of fluid temperature

5. 65. What is 'subsonic flow'?

   • A. Flow where the Mach number is less than 1
   • B. Flow where the Mach number is greater than 1
   • C. Flow where the Mach number is equal to 1
   • D. Flow with no velocity

6. 66. What is 'supersonic flow'?

   • A. Flow where the Mach number is less than 1
   • B. Flow where the Mach number is greater than 1
   • C. Flow where the Mach number is equal to 1
   • D. Flow with no velocity

7. 67. What is 'choked flow' in nozzles?

   • A. A condition where the fluid velocity reaches the speed of sound at the throat and cannot increase further even with a decrease in downstream pressure
   • B. Flow with very high velocity
   • C. Flow with very low velocity
   • D. Flow with uniform pressure

8. 68. What is 'annular flow' in multi-phase flow?

   • A. Flow regime where the liquid flows as a film along the pipe wall and the gas flows in the core
   • B. Flow with large bubbles
   • C. Flow with stratified layers
   • D. Flow with dispersed bubbles

9. 69. What is 'stratified flow' in multi-phase flow?

   • A. Flow regime where the liquid and gas phases flow in separate layers due to gravity
   • B. Flow with bubbles
   • C. Flow with droplets
   • D. Flow with slugs

10. 70. What is the purpose of a 'filter' in a fluid system?

    • A. To remove solid particles from a fluid
    • B. To heat the fluid
    • C. To cool the fluid
    • D. To mix the fluid

11. 71. What is a 'strainer'?

    • A. A device with a screen or mesh used to remove larger particles from a fluid stream
    • B. A device for mixing
    • C. A device for heating
    • D. A device for measuring flow

12. 72. What is 'flow through packed beds'?

    • A. Fluid flow through a bed of solid particles
    • B. Fluid flow through an empty pipe
    • C. Fluid flow through a porous membrane
    • D. Fluid flow through a channel