Giver the solution and choose the correct answer for the following :

$1-$ A body with sarface temperature Ts$-985C$ and $c=0\mathrm{.}85,$ the radiation heat transfer is $2000$ W $,$

a$)0\mathrm{.}6071m{m}^2$

b$)0\mathrm{.}027m^2$

c$)0\mathrm{.}039m^2$

d$)$ None

$2-$ Ose side of a plane wall is maintained at $35\mathrm{.}7**C$ and is exposed to a fluid with $T_{-}=10-C.$ If the heat flea is $297\frac{W}{m^2},$ the hear transfer coefficient is :

a$)5Wha{m}^{2}C$

b$)15\frac{W}{m^{24}}C$

c$)25Wr{m}^{20}C$

d$)$ None

stan w

b$)132\mathrm{.}6$ W

c$)187\mathrm{.}5$ W

d$)$ None hoy $=40\mathrm{.}6=m^{2}K.$ Find the heat transfer rate

$2600$

b$)372$ W

c$)621$ W

d$)$ None

$5.$ A fube $(L-Im)$ of o

I$-$ sor"C$,$ and for the ou

ndwetivity of the tube.

$10\frac{W}{m}$inK

b$)15\frac{W}{m}K$

c$)25\frac{W}{m}K$

d$)$ None