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The bore and stroke of the single-cylinder four-stroke engine are 90 mm and 120 mm respectively. The torque is 24 Nm. What is the brake mean effective pressure of the engine?(a) 3.9 bar(b) 4.9 bar(c) 5.9 bar(d) 6.9 barThe question was posed to me in an interview for job.This interesting question is from Performance Parameters and Characteristics topic in portion Automotive Electronics, Engine Performance Parameter & Testing of Automobile Engines of Automobile Engineering

Answer»

Correct OPTION is (a) 3.9 bar

Explanation: Brake mean EFFECTIVE pressure = PBM, torque = T = 24 Nm, stroke = L = 120 MM, bore = D = 90 mm. pbm = 16T / D^2L = (16*24) / (0.09*0.09*0.12) = 3.9 * 10^5 Pa = 3.9 bar.



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