Q.
A boiler is made of a copper plate 2.4 mm thick with an inside coating of a 0.2 mm thick layer of tin. The surface area exposed to gases at 700°C is 400cm2 . The maximum amount of steam that could be generated per hour at atmospheric pressure is(Kcu=0.9cal/cm−s−0&ktin =0.15cal/cm−s−0C and Lsteam =540cal/g)
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a
5000Kg
b
1000Kg
c
4000Kg
d
200Kg
answer is C.
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Detailed Solution
Qt= temperature difference thermal resistance =θ2−θ1R1+R2m=Qt× giventime LsteamWhere thermal resistance= l1K1A+l2K2A
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