Correct Answer - Option 4 : 5.4
Concept:
The compression ratio in otto cycle can be given as,
\({\bf{r}} = \frac{{{V_c} + {V_s}}}{{{V_c}}}\)
where, r = compression ratio, Vc = Clearance volume, Vs = Swept volume
Calculation:
Given:
D = 17 cm, L = 30 cm, n = Number of cylinder = 6, Vc = 9225 cm2
\({V_s} = \frac{\pi }{4}{D^2} \times L \times n = \frac{\pi }{4}\times{17^2} \times 30 \times 6 = 40856.41\;c{m^2}\)
\({\rm{r}} = \frac{{{V_c} + {V_s}}}{{{V_c}}} = \frac{{9225 + 40856.41}}{{9225}} = 5.42\)
∴ The compression ratio is 5.41.