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A six cylinder, four stroke spark-ignition engine of 10 cm x 12 cm (bore/stroke) with a compression ratio of 6 is tested at 4800 rpm on a dynamometer of arm 55 cm. During a 10 minutes test, the dynamometer reads 45 kg and the engine consumed 5 kg of petrol of calorific value 45 MJ/ kg. The carburetor receives the air at 29°C and 1 bar at the rate of 10 kg/min. Calculate:  (i)  the brake power

         (ii)   the brake mean effective pressure

         (iii)  the brake specific fuel consumption

         (iv)  the brake specific air consumption

         (v)   the brake thermal efficiency

         (vi)   the air fuel ratio

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