1st of all deside a topic.then google about it.your topic should be useful&innovative .collect material.read & understand .prepare ppt well.deliver properly.all the best..some topics are given below which may helpful...

3. The absence of coils, spark plug wires, etc. 4.The life of a diesel engine is generally about twice as long as that of a petrol engine<a href="https://en.wikipedia.org/wiki/Diesel_engine#cite_note-26" target="_blank" rel="nofollow...

1.They burn less fuel than a petrol engine performing the same work 2. Gasoline engines are typically 30 percent efficient while diesel engines can convert over 45 percent of the...

it may helpful

dhamu91what is seeback effect?when two bodies are different temparature i.e. hot&cold.if they are connected by wires(thermo couple) power will genarate.