31. In an extended surface heat exchanger, fluid having lower co-efficient
32. Which of the following has maximum thermal conductivity?
33. For specified tube outside diameter, higher BWG means higher
34. Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube
35. Which of the following has the minimum thermal conductivity?
36. 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
37. Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is
38. In case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is
39. Heat transfer occurs by natural convection because change in temperature causes difference in
40. 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
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