Question One $($Boiler$)$

a$)$ Describe how a boiler works

b$)$ Joshua is a young novice operator without any engineering background. One day he hears one of the senior operators saying that the steam pressure is about $10$ bars.

i$)$ Explain what this means to Joshua

ii$)$ Help him understand how such steam pressures are obtained in the boiler and what factors usually make these pressures fluctuate.

c$)$ How does the nature of the fuel to be used in the boiler affect the overall design of a boiler? You can use an example of $3$ people contracting you to design for them boilers. The first one wants to use firewood, the second person liquid petroleum oil $($LPO$)$ and the third person methane or natural gas. What exactly changes in the design and why?