Heat Transfer The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface) K/h0 h0/K h0/2K 2K/h0 K/h0 h0/K h0/2K 2K/h0 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a backward feed multiple effect evaporator Feed flows from low pressure to high pressure No pumps are required between successive effects Feed is introduced in the first effect None of these Feed flows from low pressure to high pressure No pumps are required between successive effects Feed is introduced in the first effect None of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The advantage of backward feed multiple effect evaporators over forward feed units is that Most concentrated liquid is at highest temperature Equal heat transfer co-efficients exist in various effects There is no additional cost of pumping Heat sensitive material can be handled Most concentrated liquid is at highest temperature Equal heat transfer co-efficients exist in various effects There is no additional cost of pumping Heat sensitive material can be handled ANSWER DOWNLOAD EXAMIANS APP
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 Excessive corrosion Decrease in heat exchanger efficiency Its evaporation loss Uneconomic LMTD Excessive corrosion Decrease in heat exchanger efficiency Its evaporation loss ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a heat exchanger, one transfer unit means The size of the exchanger in which heat transfer rate is 1 kcal/hr None of these A section of the exchanger in which change in temperature of one stream equals the average driving force in the section Both A and B The size of the exchanger in which heat transfer rate is 1 kcal/hr None of these A section of the exchanger in which change in temperature of one stream equals the average driving force in the section Both A and B ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Prandtl and Reynold's analogies are identical for Prandtl number value of 0.5 1 5 0.5 1 5 ANSWER DOWNLOAD EXAMIANS APP
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