Heat Transfer In which mode of heat transfer, the Biot number is important? Natural convection Forced convection Radiation Transient heat conduction Natural convection Forced convection Radiation Transient heat conduction ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For what value of Prandtl number, the Col-burn analogy is valid ? 0.6 to 120 0.06 to 120 1 to 103 l to 50 0.6 to 120 0.06 to 120 1 to 103 l to 50 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Increasing the liquor level in the evaporator results in the increase in liquor film co-efficient decreased effect of hydrostatic head decreased capacity increased true temperature drop increase in liquor film co-efficient decreased effect of hydrostatic head decreased capacity increased true temperature drop ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Double pipe heat exchangers are preferably useful, when Requirement of heat transfer area is low Overall heat transfer co-efficient is very high A corrosive liquid is to be heated High viscosity liquid is to be cooled Requirement of heat transfer area is low Overall heat transfer co-efficient is very high A corrosive liquid is to be heated High viscosity liquid is to be cooled ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids? At low velocity None of these At high fluid velocity When fluid flows past a smooth surface At low velocity None of these At high fluid velocity When fluid flows past a smooth surface ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The average heat transfer co-efficient over the entire length of the plate (ha) and the local heat transfer co-efficient (hL), in case of heat transfer over a flat plate in lminar zone is related as Ha = 2hL Ha= 5hL Ha = 0.8hL Ha = hL Ha = 2hL Ha= 5hL Ha = 0.8hL Ha = hL ANSWER DOWNLOAD EXAMIANS APP
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