101. In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always
102. With increase in temperature, the thermal conductivity of steel
103. Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?
104. The main function of baffles provided in a shell and tube heat exchanger is to
105. In a single effect evaporator, the economy is
106. LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is
107. Which of the following is not concerned with the heat transfer?
108. Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU.
109. In counter flow compared to parallel flow,
110. The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is
(Stefan-Boltzman constant = 5.67xl0-8 W/m2.K4)
111. Crystallisation of solids from a homogeneous solution is a/an __________ process.
112. A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is
113. Value of Prandtl number for water ranges from
114. Heat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by
115. Among liquids, water has a comparatively high value of thermal conductivity, due to its
116. Reynold's analogy states that (where, St = Stanton number f = friction factor)
117. For evaporation of viscous solution in a multiple effect evaporator, the prefered feeding scheme is
118. The sum of reflectivity and absorptivity for an opaque body is equal to
119. The film thickness for laminar film condensation on vertical surface __________ from top to bottom.
120. In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side __________ the heat transfer rate.
121. The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)
122. Heat transfer co-efficient (h1) for liquids increases with
123. A diathermaneous substance __________ the thermal radiation completely.
124. A hot body will radiate heat most rapidly, if its surface is
125. Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam.