51. Heat transfer by radiation between two bodies at T1 & T2 and in an ambient temperature of Ta°C depends on
52. Which of the following is correct?
53. Double pipe heat exchangers are used
54. Loss of heat from untagged steam pipe to the ambient air is by
55. A hot liquid is kept in a big room. The logorithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an
56. Pick out the wrong statement.
57. The equivalent diameter for the annulus of a double pipe heat exchanger, whose inner pipe has fins on the outside is __________ compared to the same size pipes without fins.
58. 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
59. Baffles in the shell side of a shell and tube heat exchanger
60. Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then
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