Heat and Mass Transfer Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without affecting the intervening medium. Hot body to cold body Larger body to smaller body Cold body to hot body Smaller body to larger body Hot body to cold body Larger body to smaller body Cold body to hot body Smaller body to larger body ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by Conduction Radiation Both convection and conduction Convection Conduction Radiation Both convection and conduction Convection ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is Depends on the area of heat exchanger Same Lower Higher Depends on the area of heat exchanger Same Lower Higher ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Which of the following would lead to a reduction in thermal resistance? In radiation, increasing the temperature and reducing the emissivity. In conduction, reduction in the thickness of the material and an increase in thermal conductivity. In convection, stirring of the fluid and cleaning the heating surface. All of these In radiation, increasing the temperature and reducing the emissivity. In conduction, reduction in the thickness of the material and an increase in thermal conductivity. In convection, stirring of the fluid and cleaning the heating surface. All of these ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body) k. A. (dx/dT) k. (dT/dx) k. A. (dT/dx) k. (dx/dT) k. A. (dx/dT) k. (dT/dx) k. A. (dT/dx) k. (dx/dT) ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Unit of thermal diffusivity is kcal/m² hr m²/hr °C m²/hr kcal/m. hr °C kcal/m² hr m²/hr °C m²/hr kcal/m. hr °C ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS