A 4-cylinder diesel engine running at 1200rpm developed 18.6KW. The average torque when one cylinder was cut out was 105N-m. If the calorific value of the fuel was 42000KJ/kg and the engine used 0.34Kg of diesel/KWhr, the indicated thermal efficiency was nearly:

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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.