The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of ‘n’ is exactly 4 for__________________?

Related Mcqs:

Critical value of the _____________ number governs the transition from laminar to turbulent flow in free convection heat transfer?

A. Grashoff B. Reynolds C. Both ‘a’ & ‘b’ D. Prandtl & Grashoff...

The thermal boundary layer at NPr > 1 ?

A. Is thicker than hydrodynamic boundary layer B. Is thinner than hydrodynamic boundary layer C. And the hydrodynamic boundary layers are identical D. Disappears...

A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an___________________?

A. Ellipse B. Straight line C. Parabola D. Circular arc...

Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ____________________?

A. Thin walled having the value of Ao Ai/< 2 B. Thick walled C. Having the value of Ao/Ai > 2 D. Both B. and C....

If air (a non-condensing gas) is present in a condensing vapor stream, it will ______________ the condensation rate of vapor?

A. Increase B. Decrease C. Not affect D. Increase the condensing film co-efficient as well as...