A. thermal conductivity
B. thermal diffusivity
C. density
D. dynamic viscosity
E. kuiematic viscosity
A. shorter wavelength
B. longer wavelength
C. remains same at all wavelengths
D. wavelength has nothing to do with it
E. none of the above
A. 0.1
B. 0.3
C. 0.7
D. 1.7
E. 10.5
The value of Prandtl number for air is about _______________________? Read More »
Heat Transfer A. same
B. higher
C. more or less same
D. very much lower
E. very much higher
Total emissivity of polished silver compared to black body is___________________? Read More »
Heat Transfer A. Wien’s law
B. Planck’s law
C. Stefan’s law
D. Fourier’s law
E. Kirchhoff’s law
The value of the wavelength for maximum emissive power is given by ___________________? Read More »
Heat Transfer A. kcal/m2
B. kcal/hr °C
C. kcal/m2 hr °C
D. kacl/m hr °C
E. kcal/m3 hr °C
The unit of overall coefficient of heat transfer is___________________? Read More »
Heat Transfer A. reflected
B. refracted
C. transmitted
D. absorbed
E. partly reflected and partly absorbed
All radiations in a black body are___________________? Read More »
Heat Transfer A. grey body
B. brilliant white polished body
C. red hot body
D. black body
E. none of the above
A. universal gas constant
B. kinematic viscosity
C. thermal conductivity
D. Planck’s constant
E. none of the above
Joule sec is the unit of_________________? Read More »
Heat Transfer A. conduction
B. convection
C. radiation
D. conduction and convection
E. convection and radiation
