A 3-cylinder, 22.86 cm by 31.75 cm, 4-stroke cycle Washington Iron Works Diesel enginc runs at 400 rpm. A prony brake was used to test its own output. The gross weight on the brake is 1223.129 N, the...

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Extracted text: A 3-cylinder, 22.86 cm by 31.75 cm, 4-stroke cycle Washington Iron Works Diesel enginc runs at 400 rpm. A prony brake was used to test its own output. The gross weight on the brake is 1223.129 N, the tare weight is 177.90 N, and the length of the brake arm is 152.4 cm. The average area of the indicator card is 5.935 cm', the length is 6.985 cm, and the indicator spring is 81.423 N/cm per cm. (Note: tare weight unladen weight Gross weight = net weight + tare weight) (a) Calculate the mechanical efficiency of the engine. (b) The engine consumes 18.14 kg of Diesel fuel per hour with a heating value of 45,362.3625 kJ/kg. Find its brake thermal efficiency based on its output.