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From the data given: Crank and connecting rod of a steam engine are 0.3 m and 1.5 m in length; The crank rotates at 150 r.p.m. clockwise. Determine the acceleration in m/s2 of the piston for the same position(angle 40 degrees from IDC).

From the data given: Crank and connecting rod of a steam engine are 0.3 m and 1.5 m in length; The crank rotates at 150 r.p.m. clockwise. Determine the acceleration in m/s2 of the piston for the same position(angle 40 degrees from IDC). Correct Answer 59.27

We know that ratio of lengths of the connecting rod and crank, n = l/r = 1.5/0.3 = 5, substituting the values into the formula of acceleration a= ω2.r ( cosθ + cos2θ /n ) = 59.27 m/s2.

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Theory of Machine mcq question image
From the data given: Piston diameter = 0.24 m, length of stroke = 0.6 m, length of connecting rod = 1.5 m, mass of reciprocating parts = 300 kg, mass of connecting rod = 250 kg; speed of rotation = 125 r.p.m ; centre of gravity of connecting rod from crank pin = 0.5 m ; Kg of the connecting rod about an axis through the centre of gravity = 0.65 m Find the correcting couple in N-m?
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