Heat Transfer The film thickness for laminar film condensation on vertical surface __________ from top to bottom. And the surface conductance increase Cummulatively decreases Remains constant Cummulatively increases And the surface conductance increase Cummulatively decreases Remains constant Cummulatively increases ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law. Nature of the body Temperature of the body None of these Wavelength of radiation Nature of the body Temperature of the body None of these Wavelength of radiation ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be 0.85 0.45 0.55 0.35 0.85 0.45 0.55 0.35 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when KA>2 kB KA < 0.5kB CPA < CPB CPA > CPB KA>2 kB KA < 0.5kB CPA < CPB CPA > CPB ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer What is the emissivity of a black body? 0.9 0.5 1 0.9 0.5 1 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For what value of Prandtl number, the Col-burn analogy is valid ? 1 to 103 0.6 to 120 l to 50 0.06 to 120 1 to 103 0.6 to 120 l to 50 0.06 to 120 ANSWER DOWNLOAD EXAMIANS APP
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