A. Wavelength of radiation
B. Surface temperature of the body
C. Nature of the surface
D. Shape and porosity of the body
Related Mcqs:
- Radiation heat transfer rates does not depend upon the_________________?
A. Type of absorbing surface
B. Distance between the heat source and the object receiving the heat
C. Surface area and temperature of the heat source
D. None of these - Shell side pressure drop in a shell and tube heat exchanger does not depend upon the_________________?
A. Baffle spacing & shell diameter
B. Tube diameter & pitch
C. Viscosity, density & mass velocity of shell side fluid
D. None of these - A black body does not ____________ radiation?
A. Absorb or emit
B. Refract
C. Reflect
D. Both B. & C. - Stefan’s block body radiation law can also be derived from ______________ law?
A. Kirchoff’s
B. Planck’s
C. Fourier’s
D. None of these - The absorptivity of a grey body at a given temperature _____________ with increasing wavelength of radiation?
A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease; depends on the material - A perfect black body is a perfect _____________ of radiation?
A. Absorber
B. Emitter
C. Both A. & B.
D. Neither A. nor B. - Which one gives the monochromatic emissive power for black body radiation ?
A. Planck’s law
B. Kirchhoff’s law
C. Wien’s law
D. Stefan-Boltzmann law - 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__________________?
A. Black painted bodies only
B. All bodies
C. Polished bodies only
D. A black body - A black body when hot, emits heat radiation of _____________ wavelengths?
A. Small
B. Large
C. All
D. One fixed - Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.) ?
A. √d
B. d
C. d2
D. d1.5
