41. Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate?
42. In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.
43. In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube?
44. Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.
45. The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is
46. Poisson's ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson's ratio for structural and pressure vessel steel may be taken as
47. Of the pressure vessels, with same thickness but different diameters, which one withstands higher pressure?
48. Steam is preferred to be used as a heating medium in heat exchangers, because of its
49. Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids.
50. The wall thickness for a large high pressure pipeline is determined by the consideration of the
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