The following reasons are mentioned while recommending supercharging for the engines used in aeroplanes and submarines: 1) More volumetric efficiency better combustion and increased power output. 2) Higher peak pressure, increased temperature and smaller size. Which of the above reason is/are correct?

Option 1 : 1 only

Concept:

• The purpose of supercharging an engine is to raise the density of the air charge, before it enters the cylinders.
• Thus, the increased mass of air will be inducted which will then be compressed in each cylinder.
• This makes more oxygen available for combustion.
• Consequently, more air and fuel per cylinder will be forced into the cylinder, and this can be effectively burnt during the combustion process to raise the engine power output to a higher value.
• The higher peak pressure and increased temperature will lead to a large size or bulky engine and hence will increase the weight of the aeroplanes and submarines.