Q. For a cylinderical vessel of moderate height, the weld joint efficiency for joints parallel to the cylinderical axis is given as 1.0, while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylinderical vessel, what value of weld joint efficiency should be used ?

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Q. Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.

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Q. The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is __________ cms.

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Q. Lap joints are preferred for plates having thickness __________ mm.

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Q. Maximum allowable vapour velocity in a bubble cap tower is determined by the

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Q. Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

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Q. The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.

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Q. Of the pressure vessels, with same thickness but different diameters, which one withstands higher pressure ?

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Q. Reflux ratio variation in a distillation column is between

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Q. In a distillation column, minimum clearance to be maintained betweeen the overflow weir and the last row of the bubble caps is __________ cms.

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Q. Which of the following lengths of heat exchanger tubes are normally not used in practice ?

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Q. A pipe is generally made of circular cross-section, because a circular cross-section has the

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Q. In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hᵢ) vanishes after a Reynold number of

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Q. In inclined long tube vertical evaporators, the tubes are inclined at an angle of

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Q. In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.

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Q. The wall thickness for a large high pressure pipeline is determined by the consideration of the

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Q. In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference

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Q. Skirt support is the most suitable for supporting __________ vessels.

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Q. The minimum plate spacing in most of the pertroleum refinery distillation columns (of dia > 3 ft) is normally __________ inches.

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Q. Joint efficiency (J) for a seamless pipe is

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