Q-5: The air flow to a four-cylinder, four-stroke diesel engine is 2.15 m'/min. During a test on the engine the following data were recorded: Cylinder bore 10.5 cm 12.5 cm 1200 rpm 150 N-m 5.5 kg/h 43124 kJ/kg 20°C 1.03 bar Piston stroke Rotational speed Braking torque Fuel consumption Fuel heating value Ambient temperature Ambient pressure Calculate for these conditions: • Brake thermal efficiency. • Brake mean effective pressure. • Volumetric efficiency.

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Buckling of columns

The column is described as a vertical member of the structure that carries an axial compressive load, and buckling is a lateral deformation of the column under the application of load.