• question_answer A thin flat Plate $2\,m\,\times \,2\,m$ is hanging freely in air. The temperature of the surrounding is $25{}^\circ C.$ Solar radiation is falling on one side of the plate at the rate of 500 $W/{{m}^{2}}.$ What should be the convective heat Transfer coefficient in $W/{{m}^{2}}{}^\circ C,$ if the temperature of The plate is to remain constant at $30{}^\circ C?$ A) 25                                B) 50C) 100                              D) 200

$Q={{h}_{c}}\,A.dt$ 500 $={{h}_{c}}\times 2\times 2\,\left( 30-25 \right)$ ${{h}_{c}}=\frac{500}{20}=25\,W/{{m}^{2}}C$