Question: A gas engine working on four-stroke cycle has a cylinder of (250 mathrm{~mm}) diameter, length of stroke (450 mathrm{~mm}) and is running at (180 mathrm{rpm}).

A gas engine working on four-stroke cycle has a cylinder of $250 \mathrm{~mm}$ diameter, length of stroke $450 \mathrm{~mm}$ and is running at $180 \mathrm{rpm}$. Its mechanical efficiency is $80 \%$; mean effective pressure is $0.65 \mathrm{MPa}$, Find: (i) indicated power, (ii) brake power, and (iii) friction power.

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