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131. For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
132. For heat flow through very thick walled cylinder, use _________mean radius.
133. For hot feed, forward feeding as compared to backward feeding results in _________'economy.
134. For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it
135. For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
136. For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)
137. For specified tube outside diameter, higher BWG means higher
138. For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it
139. For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is
140. For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus- Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of