A boiler is made of a copper plate `2.4mm` thick with an inside coating of a `0.2mm` thick layer of tin The surface area exposed to gases at `700^(@)C` is `400cm^(2)` The maximum amount of steam that could be generated per hour at atmospheric pressure is
`({:(K_(cu)=0.9cal//cm-s-^(0)&k_("tin"=0.15cal//cm/s/^(0)C),,,,),(andL_(steam)=540cal//g,,,,):})` .

Options

A. `5000 Kg`
B. `1000 Kg`
C. `4000 Kg`
D. `200 Kg`

Answer

C

Explanation

`i_(H) = (DeltaT)/(R_(eq)) = (700 - 100)/(R_(1)+R_(2))`
Where `R_(eq) = R_(1) +R_(2) = (0.24)/(0.9 xx 400) +(0.02)/(0.15 xx 400)`
`i_(H) = (dQ)/(dt) = (DeltaQ)/(Deltat) = (DeltamL)/(Deltat)`
`(Deltam)/(Deltat) = (i_(H))/(L)` where `L = 540 cal//gm, Deltat = 3600 sec`.