Section B $($Answer any Three Full Questions$)$

Q$2$ An auto engine working with Otto cycle having the initial pressure of $1\mathrm{.}2$ bar and $60C$ and the pressure after constant volume heat addition is $28$ bar. This engine is having the clearance volume of $0\mathrm{.}00284m^3,254mm$ bore and $378mm$ stroke. Determine

$($i$)$ Stroke volume;

$($ii$)$ Total volume and compression ratio;

$($iii$)$ The air standard efficiency;

$($iv$)$ The mean effective pressure;

$[5]$

$[5]$

$[5]$

$[5]$

$($v$)$ Analyze the effect on the efficiency if the bore diameter is increased.

$[5]$