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QUESTION 1An

ideal Otto cycle has a compression ratio of 8. At the beginning of the

compression process air at 95 kPa temperature at 27oC 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)

QUESTION 2Methane (CH4) is burned completely

with stoichiometric amount of air during a steady-flow combustion process. Both

the reactant and the product are maintained at 25oC 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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