Please answer the following questions:

8. The power supplied to a certain 4 cylinder diesel powered car is 240,000 W. The calorific value of the diesel fuel is 44.3 MJ/kg and its overall efciency is 22.2%. a. Calculate the output power (2) b. Calculate the fuel ow rate (2) c. The crank shaft revolves at a rate of 2150 rpm. Calculate the number of cycles per second. (2) d. The net work done by each cylinder during each engine cycle is 4150 J. Calculate the indicated power of the engine. (2) 9. a. Which type of engine does not need a spark plug to ignite the gas? (1) A. Petrol B. Diesel C. External combustion b. In a 4-stroke petrol engine, describe what happens to the temperature, volume and pressure of the gas during the stroke when the piston is moving downwards and the two valves are both closed? Also give the name of this stroke. Draw a diagram to illustrate your answer. (4)