During a dynamometer test a 4 cylinder, 4 stroke diesel engine develops an indicated meaneffective pressure of 850 KN/m2 at an engine speed of 2000rpm. The engine has a bore of93mm and stroke of 91mm. The test runs for 5 min, during which time 0.8kg of fuel isconsumed. Mechanical efficiency is 83%. Calorific value of the fuel is 43MJ/kg.Calculatei) The indicated power and Brake power (6 marks)ii) The energy supplied from the fuel per second. (5 marks)iii) The indicated and brake thermal efficiency. (6 marks)iv) The Brake specific fuel consumption in kg/KWh.

A four cylinder, four-stroke cycle petrol engine has a bore 90 mm and a piston stroke 90 mm.Running at 80 revs/s, the indicated mean effective pressure is 630 kN/m2 and the fuelconsumption in an hour is 12 kg. The mechanical efficiency is 80 %. The calorific value of thefuel is 43 MJ/kg. Determine:(i) The indicated power. (6 marks)(ii) The brake power. (3 marks)(iii) The brake thermal efficiency. (5 marks)(iv) The brake mean effective pressure

A performance test on a single cylinder, four stroke, reciprocating internalcombustion petrol engine produced the following data:The indicated mean effective pressure 119.7kN/m2The swept volume 0.014m3Engine speed 2000rev/minThe mechanical efficiency 72%Fuel consumption 2 x 10-6 m3/sDensity of fuel 740kg/m3Calorific value of fuel 43,000 kJ/kgAir flow rate into the engine 0.025 m3/sAir density 1.2 kg/m3Exhaust temperature 502oCSpecific heat capacity of exhaust gas 1.01kJ/kgKCooling water inlet temperature 12oCCooling water outlet temperature 52oCCooling water flow rate 0.12kg/sSpecific heat capacity of cooling water 4.2kJ/kgKAir temperature at engine inlet 12oC.(i) Carry out an energy balance on the engine and show that the first law ofthermodynamics is valid.

With the aid of sketches, describe and contrast the 4 stroke petrol engine cycle and Dieselcycle in relation to their P-v diagrams. Label each stroke clearly and show where heat issupplied and where work output occurs

16 A technical article about diesel engines expresses the energy available from diesel fuel both as41.8 MJ kg –1 and as 34.9 GJ m–3.What is the density of diesel fuel?A 8.35  10 2 kg m–3B 1.20  10 3 kg m–3C 8.35  10 5 kg m–3D 1.20  10 6 kg m–317 What is meant by the efficiency of a system?A the difference between the useful energy output from the system and the total energy inputB the difference between the useful energy output from the system and the wasted energyoutputC the ratio of the useful energy output from the system to the total energy inputD the ratio of the useful energy output from the system to the wasted energy output

A four cylinder four stroke spark ignition engine has a bore of 80 mm and stroke of 80mm. The compression ratio is 8. Calculate;(i) The engine capacity. (3 marks)(ii) The clearance volume of each cylinder