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 Excessive corrosion Decrease in heat exchanger efficiency Uneconomic LMTD Its evaporation loss Excessive corrosion Decrease in heat exchanger efficiency Uneconomic LMTD Its evaporation loss ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be W/m.k W/m.k² None, A is just a number W/m W/m.k W/m.k² None, A is just a number W/m ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is Less Some More Either more or less ; depends on the nature of vapor Less Some More Either more or less ; depends on the nature of vapor ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter) 0.4 D 0.5 D 0.3 D 0.2 D 0.4 D 0.5 D 0.3 D 0.2 D ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent. 26 18 1 7 26 18 1 7 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer What is the geometric mean of two heat transfer areas A₁ and A₂ ? √(A₁ . A₂) √(A₁ + A₂) 1/2 √(A₁ . A₂) 2 √(A₁ . A₂) √(A₁ . A₂) √(A₁ + A₂) 1/2 √(A₁ . A₂) 2 √(A₁ . A₂) ANSWER DOWNLOAD EXAMIANS APP
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