ME 322 : IC Engine Reg. No. : ………………….……………. 1. Define the compression ratio of an engine. …………………………………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………………… 2. Why Petrol engines have a lower compression ratio than Deisel engines. ……………………………………………………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………………………………. 3. Name the 4 strokes of a 4 stroke engine. ……………………………………………………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………………………………. 4. Explain the difference between the ignition system of a petrol engine and diesel engine. ………………………………………………………………………………………………………………………………………………….… ………………………………………………………………………………………………………………………………………………….… ………………………………………………………………………………………………………………………………………………….… ……………………………………………………………………………………………………………………………………………………. 5. What is the purpose of the flywheel of an engine. ………………………………………………………………………………………………………………………………………………….… ………………………………………………………………………………………………………………………………………………….… ………………………………………………………………………………………………………………………………………………….… ……………………………………………………………………………………………………………………………………………………. 6. Define the calorific value of a fuel. ………………………………………………………………………………………………………………………………………………….… ………………………………………………………………………………………………………………………………………………….… ………………………………………………………………………………………………………………………………………………….… ……………………………………………………………………………………………………………………………………………………. 7. What is known as a ‘rich mixture’ and a ‘weak mixture’ of air and fuel. ………………………………………………………………………………………………………………………………………………….… ………………………………………………………………………………………………………………………………………………….… ……………………………………………………………………………………………………………………………………………………. 8. Usually an engine starts with a zero load, Why? ….………………………………………………………………………………………………………………………………………………… ….………………………………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………............ ..........................................................................................................................................................