jannatul,
you one basic question needs many corrections. The size of an engine is equal to the volumetric capacity--not the amount of fuel to be supplied. You just need to supply sufficient fuel to achieve the proper stoichiometric mixture for combustion (presuming you're referring to an internal combustion engine and not a steam engine).
As for your second question, that, too, really requires a lot of clarification I'm not sure you're prepared to make. Suffice it to say that if the engine is driving a synchronous generator and synchronized to a grid with other synchronous generators and their prime movers the speed of the engine and generator will be controlled by the frequency of the grid. To increase power output you would need to increase the fuel flow-rate to the engine.
If the engine-generator were operating independently of any other synchronous generators the only way to increase the power output while maintaining a constant speed and frequency is to turn on more motors or lights or televisions or computers and computer monitors. Then you--or the engine governor (control system)--would see an immediate decrease in speed and an increase in load. To return to the same speed while supplying the increased load it would be necessary to increase the fuel flow-rate to the engine.
There are numerous threads on control.com about droop and isochronous speed control--which is essentially what you are enquiring about. Use the cleverly-hidden 'Search' feature at the far right of every control.com webpage (after looking at the Search 'Help' function) and you will find lots of information about speed control and frequency and load changes. Look for threads with the bicycle analogy, that may help you to get a handle on the topic a little faster.
Hope this helps!
you one basic question needs many corrections. The size of an engine is equal to the volumetric capacity--not the amount of fuel to be supplied. You just need to supply sufficient fuel to achieve the proper stoichiometric mixture for combustion (presuming you're referring to an internal combustion engine and not a steam engine).
As for your second question, that, too, really requires a lot of clarification I'm not sure you're prepared to make. Suffice it to say that if the engine is driving a synchronous generator and synchronized to a grid with other synchronous generators and their prime movers the speed of the engine and generator will be controlled by the frequency of the grid. To increase power output you would need to increase the fuel flow-rate to the engine.
If the engine-generator were operating independently of any other synchronous generators the only way to increase the power output while maintaining a constant speed and frequency is to turn on more motors or lights or televisions or computers and computer monitors. Then you--or the engine governor (control system)--would see an immediate decrease in speed and an increase in load. To return to the same speed while supplying the increased load it would be necessary to increase the fuel flow-rate to the engine.
There are numerous threads on control.com about droop and isochronous speed control--which is essentially what you are enquiring about. Use the cleverly-hidden 'Search' feature at the far right of every control.com webpage (after looking at the Search 'Help' function) and you will find lots of information about speed control and frequency and load changes. Look for threads with the bicycle analogy, that may help you to get a handle on the topic a little faster.
Hope this helps!