maxiniues hus iranifer: $($nimen$)$

$\backslash$table$[[$Q$18,$The wayrways of heat thansfer is are?,$],[,($A$),$Conduction.$],[,($B$),$Convection.$],[,($C$),$Radiation$],[,($D$),$Conduction, cotwection$,$ and radiation.$],[,($E$),$None of them.$]]$

Q$21$ A $13\mathrm{.}8m^2$ of a vertical house wall consists of stone and concrete as series layers. The themal resistance for the stone mnd concrete are $0\mathrm{.}11$ and $0\mathrm{.}22\frac{K}{W},$ respectively. If the convective heat transfer coefficient for each side of the wall $h=0\mathrm{.}17\frac{W}{m^2}K,$ what is the total thenmil resistance $(\frac{K}{W})?$

$($A$)22\mathrm{.}68$

$($B$)$

$($C$)1\mathrm{.}18$

$($D$)0\mathrm{.}33$

$($E$)$ None of them

Q$22$ A $2\mathrm{.}44m^2$ of a wall with thermal conductivity of $0\mathrm{.}26$ W$/$m $K$ has a dhickness of $0\mathrm{.}16m.$ If the Amperatures of wall side surfaces are $57\mathrm{.}3C$ and $22C,$ what is the heat uanisfer through the wall $($W$)?$

$\backslash$table$[[($A$),57\mathrm{.}36,($B$),314\mathrm{.}42]]$

$($C$)8\mathrm{.}90$

$139\mathrm{.}96$

$($B$)$ None of them

$3$