The sum of reflectivity and absorptivity for an opaque body is equal to____________________?
The sum of reflectivity and absorptivity for an opaque body is equal to____________________?
A. 0.5
B. 1
C. 0
D. 2
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Temperature profile in steady state heat transfer is________________?
Temperature profile in steady state heat transfer is________________?A. Asymptotic
B. Hyperbolic
C. Parabolic
D. LinearHeat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?A. 0.2
B. 0.4
C. 0.6
D. 0.8Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is ________________ law?
Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is ________________ law?A. Stefan’s
B. Dalton’s
C. Wien’s
D. Kirchoff’sWhen does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids ?
When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids ?A. At high fluid velocity
B. At low velocity
C. When fluid flows past a smooth surface
D. None of theseIn case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is_________________?
In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is_________________?A. Linear
B. Hyperbolic
C. Parabolic
D. None of theseResistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.) ?
Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.) ?A. t
B. 1/ρ
C. 1/A
D. All A., B. & C.