Heat and Mass Transfer Thermal diffusivity is A dimensionless parameter A physical property of the material Function of temperature Used as mathematical model A dimensionless parameter A physical property of the material Function of temperature Used as mathematical model ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by Convection Radiation Forced convection Free convection Convection Radiation Forced convection Free convection ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity) P = 0, x = 0 and a = 1 P = 0, x = 1 and a = 0 P=1, T = 0 and a = 0 X = 0, a + p = 1 P = 0, x = 0 and a = 1 P = 0, x = 1 and a = 0 P=1, T = 0 and a = 0 X = 0, a + p = 1 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The highest thermal diffusivity is of Lead Iron Wood Concrete Lead Iron Wood Concrete ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called Emissive power Emissivity None of these Absorptive power Emissive power Emissivity None of these Absorptive power ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Thermal conductivity of glass wool varies from sample to sample because of variation in All of these Composition Density Porosity All of these Composition Density Porosity ANSWER DOWNLOAD EXAMIANS APP
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