The following data available for four stroke petrol engine : bore \(=20 \mathrm{~cm}\) stroke to bore ratio \(=\) 1.5

, speed \(=350 \mathrm{rpm}, \mathrm{p}_{\mathrm{m}}=2.75 \mathrm{bar}\), net brake load \(=610 \mathrm{~N}\), effective diameter of brake drum \(=\) \(1 \mathrm{~m}\), petrol consumption \(=4.25 \mathrm{~kg} / \mathrm{hr}\), C.V. of petrol \(=44 \mathrm{MJ} / \mathrm{kg}\).

Determine : \(

(a) \operatorname{IP}

(b) \mathrm{BP}

(c) \eta_{\text {mech }}(4)\left(\eta_{\text {th }}\right)_{i},(5)\left(\eta_{\text {th }}\right)_{b}\)