Heat and Mass Transfer In regenerator type heat exchanger, heat transfer takes place by Generation of heat again and again Flow of hot and cold fluids alternately over a surface Direct mixing of hot and cold fluids A complete separation between hot and cold fluids Generation of heat again and again Flow of hot and cold fluids alternately over a surface Direct mixing of hot and cold fluids A complete separation between hot and cold fluids ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer A grey body is one whose absorptivity Does not vary with temperature and. wavelength of the incident ray Is equal to its emissivity Varies with wavelength of the incident ray Varies with temperature Does not vary with temperature and. wavelength of the incident ray Is equal to its emissivity Varies with wavelength of the incident ray Varies with temperature ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a Opaque body Black body Grey body White body Opaque body Black body Grey body White body ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law. None of these Inversely proportional to Directly proportional to Equal to None of these Inversely proportional to Directly proportional to Equal to 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 Both convection and conduction Convection Radiation Conduction Both convection and conduction Convection Radiation ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Which of the following is expected to have highest thermal conductivity? Solid ice Steam Melting ice Water Solid ice Steam Melting ice Water ANSWER DOWNLOAD EXAMIANS APP
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