Heat Transfer The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities εx & εy is given by Εx . εy Εx + εy 1/εx + 1/εy (εx + εy)/(εx + εy - εx . εy) Εx . εy Εx + εy 1/εx + 1/εy (εx + εy)/(εx + εy - εx . εy) ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer jH factor for heat transfer depends upon the __________ number. Nusselt Reynolds Prandtl Biot Nusselt Reynolds Prandtl Biot ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8. 20.4 40.8 20.8 40.4 20.4 40.8 20.8 40.4 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator. Increases May increase or decrease, depends on the vacuum Decreases Remains constant Increases May increase or decrease, depends on the vacuum Decreases Remains constant ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following has the minimum absorptivity? Aluminium foil Coal dust Iron plates Refractory bricks Aluminium foil Coal dust Iron plates Refractory bricks ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Thermal diffusivity of a material Is the ratio of thermal conductivity to thermal capacity Has the unit m² /sec All of these Is defined as K/ρ . Cp Is the ratio of thermal conductivity to thermal capacity Has the unit m² /sec All of these Is defined as K/ρ . Cp ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS