Question

For a porter governor, Each arm has a length of 250mm and pivoted on the axis of rotation. Sleeves carry a mass of 25kg and each ball’s mass is 5Kg. Radius of rotation: 150mm at the beginning of lift and 200mm at the maximum speed of governor. Find range in speed neglecting friction in rpm.

(a) 25

(b) 35

(c) 45

(d) 15

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Answer 1

Correct option is (a) 25

The best explanation: For minimum position, h1 = 200 mm

N1^2= (m+M)/m x 895/h1 = 26850 rpm

For maximum position,

h2=150 mm

N2^2 = (m+M)/m x 895/h2 = 35800 rpm

Range = N2 – N1 = 25 rpm