Q1: The turning-moment diagram for a petrol engine is drawn to a vertical scale of1mm = 500 N.m and horizontal scale of 1mm = 3. The turning moment diagramrepeats itself after every half revolution of the crankshaft. The areas above and below themean torque line are 260, -580, 80, -380, 870, and -250mm². The rotating parts havea mass of 55 Kg and radius of gyration of 2.1m. If the engine speed is 1600 rpm,determine the coefficient of fluctuation of speed.34x1392

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Answered: Q1: The turning-moment diagram for a…

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.61P

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The turning moment diagram for a petrol engine is drawn to the following scales : Turning moment, 1 mm = 5 Nm; crank angle, 1 mm = 1°. The turning moment diagram repeats itself at every half revolution of the engine and the areas above and below the mean turning moment line taken in order are 295, 685, 40, 340, 960, 270 mm. The rotating parts are equivalent to a mass of 36 kg at a radius of gyration of 150 mm. Determine the coefficient of fluctuation of speed when the engine runs at 1800 r.p.m.
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