A. 5.6697 × 10-8W/m2.°K4
B. 0.1714 × 10-8W/m2.°K4
C. 5.6697 × 10-8kcal/m2. °K4
D. 0.1714 × 10-8kcal/m2. °K4
Related Mcqs:
- The Stefan-Boltzmann constant depends on the_________________?
A. Medium
B. Temperature
C. Surface
D. None of these - The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10-8 W/m2.K4) ?
A. 1000
B. 727
C. 800
D. 1200 - Stefan-Boltzmann law applies to _____________ body?
A. Black
B. White
C. Grey
D. Any colour - 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 - 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 unit of heat transfer co-efficient is_________________?
A. BTU/hr. ft2°F
B. BTU/hr. °F. ft
C. BTU/hr. °F
D. BTU/hr. ft - Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?
A. 1
B. < 1
C. > 1
D. > 5 - The unit of conductance in SI unit is_______________?
A. W/m
B. W/m2
C. W/°K
D. W/m°K - The unit of heat transfer co-efficient in SI unit is____________________?
A. J/M2°K
B. W/m2°K
C. W/m°K
D. J/m°K - The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is__________________?
A. 2.36
B. 4.36
C. 120.36
D. Dependent on NRe only
