Afour cylinder four stroke petrol engine wastested and
following results were obtained.
petrol consumption: 5 kg/hour, speed: 750rpm, a/f
ratio: 11, temp. at the end of compression: 375oc,
pressure atthe end of compression stroke : 12 bar, relative
efficiency: 50%,diameter of cylinder: 85mm, stroke of piston:
120mm, calorificvalue of fuel: 42,000 kj/kg. find the indicated thermalefficiency and sfc based on
indicatedpower.

For each of the following process: a) sketch the p-v diagram, b)sketch t-s diagram, c) sketch t-v diagram, d) sketch the boundary work on one of the diagrams (a, b or c) and e) sketch the reversible heat transfer on one of the diagrams (a, b or c): 1- isobaric process from compressed liquid to superheated vapor 2- isothermal process from compressed liquid to superheated vapor 3- isentropic process from compressed liquid to superheated vapor