$($b$)$ Consider an electro$-$pneumatic system using two double$-$acting cylinders $1$A and $2$A: When a selector$($detent$)$ switch is ON$,$ cylinder $1$A moves forward. When cylinder $1$A reaches the maximum forward position, cylinder $2$A advances. When cylinder $2$A reaches the maximum forward position, both cylinder retracts simultaneously. The to and fro continues until the selector switch is turned OFF.

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$($i$)$ Develop an electro$-$pneumatic diagram;

$[5]$

$($ii$)$ Develop the electrical circuit diagram.

$[10]$

Total $25$ Marks