During testing of single cylinder two-stroke petrol engine, following data were obtained—brake torque = 640 Nm; cylinder diameter = 21 cm, speed = 250 rpm; stroke = 28 cm; m.e.p. = 5.6 bar; oil...

During testing of single cylinder two-stroke petrol engine, following data were obtained—brake torque = 640 Nm; cylinder diameter = 21 cm, speed = 250 rpm; stroke = 28 cm; m.e.p. = 5.6 bar; oil consumption = 8.16 kg/hr; C.V. = 42,705 kJ/kg.

Determine:

indicated thermal efficiency,