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$\backslash$hline & friction material is $1\mathrm{.}5$ MPa $.$ Arm of the actuating force applied by the cam is $120$ mm and the drum rotates at $450$ rpm clockwise. Determine actuating force needed to upply the brake Also the power absorption capacity of the leading and trailing shoes. & & $\backslash \backslash$

$\backslash$hline $($b$)$ & In a transmission dynamometer, the driving pulley diameter is $400$ mm and driven pulley diameter is $500$ mm $.$ The arm of the lever is $1200$ mm and a dead weight of $30$ kg is appliod at the end of the lever tor measurement of power. Determine the power developed by the prime maver. Also draw a neat sletch of the

dynamometer. & $\backslash [$

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The number of teeth in the gear train shown below is $\backslash ($ T$\_\{$s$\}=18.$ T$=24\backslash ),\backslash (\backslash$mathrm$\{$T$\}\_\{\backslash$mathrm$\{$b$\}\}=12\backslash )$ and $\backslash (\backslash$mathrm$\{$T$\}\_\{4\}=72\backslash ).$ P and C term a compound gear carried by the arm $\backslash ($ D $\backslash )$ and the arinular gear $\backslash ($ A $\backslash )$ is heid stationary. Determine the speed of the Cutput shas and the holding forcue requred if $5$ kW power is delivered to S at $800$ rpm $.$ Take the transmiss on efficienty as $\backslash (100\backslash \%\backslash )\backslash \backslash$

In case the annulus rotates in the same direction as S$,$ what will be the new speed of D$?$

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$\backslash$hline $($b$)$ & A pair of helical gears is used Sor transmission of power. The gear ratio of $3$ and the pinion has $21$ teeth and module is $5$ mm $.$ The normal pressure angle is $\backslash (20^\{\backslash$circ$\}\backslash ).$ If the helix angle is $\backslash (8^\{2\}\backslash ).$ The resultant tooth force is limited to $250$ N due to material limitations$.$ Determine the power transmitting capacity of the gear train. on the two elements of the gear train showing the free body diagrams. & $[08]$ & CO$4\backslash \backslash$

$\backslash$hline $($a$)1$ & In a four bar chair mechanism is shown in the figure below the crank $\backslash ($ A B $\backslash )$ makes $65$ from the IDC. Link lengths are: $\backslash ($ A B$=30\backslash$mathrm$\{$~cm$\}\backslash ),\backslash ($ B C$=50\backslash$mathrm$\{$~cm$\},$ C D$=55\backslash$mathrm$\{$~cm$\}\backslash )$ and $\backslash (\backslash$mathrm$\{$AD$\}=60\backslash$mathrm$\{$~cm$\}\backslash )$ Link BC has mass of $12$ kg and its mass centre subjected to a resultant acceleration of $\backslash (48\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$sec$\}^\{2\}\backslash )$ making $\backslash (280^\{\backslash$circ$\}\backslash )$ angle from the reference. The mass centre of the linics can be assumed to be at the mid$-$span. & $(12)$ & CO$4\backslash \backslash$

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