151. Convective heat transfer, in which heat is transferred by movement of warmed matter is described by
152. As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient
153. Heat transfer rate per unit area is called
154. Log mean temperature difference (LMTD) cannot be used, if
155. In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head.
156. For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would
157. In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is
158. For what value of Prandtl number, the Col-burn analogy is valid ?
159. In a forward feed multiple effect, the pressure build up will be
160. Film boiling is usually not desired in commercial equipments, because
161. 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
162. 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
163. Film condensation is promoted on a/an __________ surface.
164. Dietus-Boelter equation cannot be used for molten metals mainly due to its very low
165. If Prandtl number is greater than the Schmidt number, then the
166. Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ?
167. Rate of heat transfer by vaporisation from pools of water is affected by the
168. Multiple effect evaporators are commonly used in the manufacture of
P. Paper Q. Superphosphate
R. Sugar S. Fats
169. Which of the following has the highest thermal conductivity ?
170. Which of the following is unimportant in forced convection ?
171. Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is
172. In a multiple effect evaporator, the effect of boiling point elevation is to
173. In which field did Swathi Thirunal distinguished himself?
174. Dropwise condensation occurs on __________ surfaces.
175. For specified tube outside diameter, higher BWG means higher