The lengths of upper and lower arms of a Porter governor are 220 mm and 260 mm

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The lengths of upper and lower arms of a Porter governor are 220 mm and 260 mm respectively.

All the arms are pivoted on the axis of rotation. The central load is 125 N and weight of each ball is 15 N. The friction of sleeve together with the resistance of the operating gear is equivalent to a force of 25 N at the sleeve. If the limiting inclinations of the upper and lower arms to the vertical are 30° and 40°, respectively, determine the range of speed of the governor.

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