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Indicator card

What is indicator card ? And why it is taken .

It is the diagram which is pressure between the relative position of piston in the cylinder i.e volume .

It is  taken to
1. Calculate the indicated power of an engine.
2. Examine the scavenging and exhaust process.
3. To find out the peak pressure and compression pressure .
4. To examine the combustion process inside the cylinder .

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