7) What is the importance of blowers in terms of volume flow rate and delivered head?

9) In ducting and piping systems, what is the difference between major and minor head losses and

how are they computed?

10) What are the limitations for selecting fans and pumps?

11) What are the limitations when selecting air compressors?

12) Applications of fans and pump laws. Given the head and the flow rates at certain speed and size,what are the new heads and flow rates at new speeds or different size of the same geometry type? 14) What is the key parameter when selecting valves? i need shortly answer