During which phase of a four-stroke engine are waste gases removed? A) combustion stroke B) exhaust stroke C) intake stroke D) power stroke

State the operation principle of pressure-limiting variable vane pump according to the following figure

In a gasoline engine the piston compresses the air-fuel mixture starting at a pressure of p1 = 1 bar and an ambient temperature of 27°C. The compression ratio is 9 and the combustion process is replaced by a heat treatment process of 1500 kJ/kg. calculate a) net work, b) thermal efficiency of the engine c) average effective pressure d) maximum attainable temperature. (standard air assumption)