Afour stroke gasoline engine has a compression ratio of 10: 1 with 4 cylinders of total displacement 4.2 l. the inlet state is 100 k, 90 kpa and the engine is running at 3200 rpm with the fuel adding 1500 kj/kg in the combustion process. what is the network in the cycle and how much power is produced?

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.