Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________?

Related Mcqs:

Cpμ/K is termed as the ______________ number?

A. Grashoff B. Nusselt C. Prandtl D. Stanton...

LMTD for counter-flow and parallel flow heat exchanger will be the same, when the_________________?

A. Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid) B. Outlet temperature of both the hot and cold fluid are same C. Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid D. None of these...

Stefan-Boltzmann law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K) ?

A. t4 B. T4 C. 1/t4 D. 1/T4...

Economy of a multiple effect evaporator depends upon the _____________________?

A. Heat balance consideration B. Rate of heat transfer C. Both A. and B. D. Neither A. nor B....

Nusselt number (for forced convection heat transfer) is a function of the _____________ number?

A. Prandtl B. Reynolds C. Both A. & B. D. Neither A. nor B....