A single cylinder four stroke diesel engine works on the following data: Cylinder bore = 15 cm, stroke = 25 cm, speed= 250 rpm; area of indicator diagram = 6 cm2; length of indicator diagram = 9 cm; spring constant = 7.5 bar/cm; BSFC= 0.24 kg/kWh; CV of fuel = 42000kj/kg; diameter of brake wheel = 70 cm; rope diameter = 3.5 cm ; brake load= 40kg (392.4 N), Calculate the following performance parameter (a) Mechanical efficiency (b) Indicated thermal efficiency

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