Determine the value of the weight, Mechanical Engineering

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Illustrate with working, construction and measurement of brake power by Belt transmission type brake dynamometers?

The essential features of a transmission dynamometer are shown in Figure, A is the driving pulley which runs at 600 r.p.m.B and C are jockey pulleys mounted on a horizontal beam pivoted at D, about which point the complete beam is balanced when at rest. E is the driven pulley and all portions of the belt between the pulleys are vertical. A,Band C are each 300 mm diameter and the thickness and weight of the belt are neglected. The length DF is 750 mm. Determine :

1. the value of the weight W to maintain the beam in a horizontal position when 4.5 kW is being transmitted, and

2. the value of W, when the belt just starts to slip on pulley A. The coefficient of friction being 0.2 and maximum tension in the belt 1.5 kN.

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