Heat Engines

Who is accredited for the invention of the first modern(four-stroke petrol) internal combustion engine?

Who created the first commercially successful internal combustion engine?

A swing-piston engine is a type of_____.

'Diesel engine' is which type of engine?

Even Carnot engine cannot give $100\%$ efficiency because we cannot

A Carnot engine works between constant temperature $T_1$ and $T_2$ of source and sink, respectively. For efficiency to be greatest