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**QUESTION 1**

An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air at 95 kPa, temperature at 27^{o}C and 750 kJ/kg of heat is transferred during the constant-volume heat addition process.

a) Draw and label the P-v diagram for this process. **(2 marks)**

b) Calculate the pressure at the end of the heat addition process in kPa. **(4 marks)**

**c) **Calculate the temperature at the end of the heat addition process in K. **(4 marks) **

d) Calculate the net work done in kJ/kg. **(2 marks)**

e) Calculate the mean effective pressure in kPa. **(3 marks)**

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**QUESTION 2**

Methane (CH_{4}) is burned completely with stoichiometric amount of air during a steady-flow combustion process. Both the reactant and the product are maintained at 25^{o}C and 1 atm, and water in the product is in the liquid state.

a) Determine the heat transfer from the combustion chamber during this process.

**(11 marks)**

b) Calculate the Air Fuel Ratio. **(2 marks)**

c) If the combustion was achieved with 100% excess air would your answer be different? Explain. **(2 marks)**

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