Heat Transfer The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid Uneconomic LMTD Its evaporation loss Decrease in heat exchanger efficiency Excessive corrosion Uneconomic LMTD Its evaporation loss Decrease in heat exchanger efficiency Excessive corrosion ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following has the minimum absorptivity? Coal dust Refractory bricks Iron plates Aluminium foil Coal dust Refractory bricks Iron plates Aluminium foil ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger? Pressure Density Viscosity Corrosiveness & fouling characteristics Pressure Density Viscosity Corrosiveness & fouling characteristics ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In which mode of heat transfer, the Biot number is important? Forced convection Transient heat conduction Radiation Natural convection Forced convection Transient heat conduction Radiation Natural convection ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the Temperature gradient produced due to density difference Buoyancy of the bubbles produced at active nucleation site Existence of thermal boundary layer None of these Temperature gradient produced due to density difference Buoyancy of the bubbles produced at active nucleation site Existence of thermal boundary layer None of these ANSWER DOWNLOAD EXAMIANS APP
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 1/εx + 1/εy Εx . εy (εx + εy)/(εx + εy - εx . εy) Εx + εy 1/εx + 1/εy Εx . εy (εx + εy)/(εx + εy - εx . εy) Εx + εy ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS