Make a sketch and find the suitable standard module, face width, pitch circle diameters and no$.$ of teeth for a pair of bevel gear to transmit a power of $20$ KW between two perpendicular shafts. The speed of the driving shaft is $900$ rpm and that of the driven gear is $300$ rpm$.$ The allowable static stress for $35$C$6$ material of pinion is $205$ N$/$mm$2$ and that for cast steel material of gear is $125$ N$/$mm$2.6/(6+$v$)$ and y $=0\mathrm{.}124-0\mathrm{.}684/$Zf where symbols have their The pressure angle is $142\backslash$deg $.$ Take c $=$ usual meanings. $[$Note: Do not check for Dynamism and Wear loads$]$