QUESTION 1An ideal Otto cycle has a compression ratio of 8. At the beginning of

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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