Heat Transfer Indirect contact heat exchangers are preferred over direct contact heat exchangers, because Cost of equipment is lower There is no risk of contamination There is no mist formation Heat transfer co-efficient are high Cost of equipment is lower There is no risk of contamination There is no mist formation Heat transfer co-efficient are high 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. 20.8 40.4 40.8 20.4 20.8 40.4 40.8 20.4 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time t = 400 s t = 283 s t = 356 s t = 800 s t = 400 s t = 283 s t = 356 s t = 800 s ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Absorptivity and refletivity of a perfect black body are respectively 0 and 0.5 0 and 1 1 and ? 1 and 0 0 and 0.5 0 and 1 1 and ? 1 and 0 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For hot feed, forward feeding as compared to backward feeding results in __________ economy. No effect on Decreased None of these Increased No effect on Decreased None of these Increased ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Vacuum is generally maintained in the vapour space of an evaporator mainly to Facilitate forward feeding in multiple effect evaporation Get economical temperature difference by using moderate pressure steam Concentrate heat sensitive materials Achieve very high concentration of the final product Facilitate forward feeding in multiple effect evaporation Get economical temperature difference by using moderate pressure steam Concentrate heat sensitive materials Achieve very high concentration of the final product ANSWER DOWNLOAD EXAMIANS APP
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