Q. Needle valves are generally not used for

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Q. Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the

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Q. Pick out the wrong statement.

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Q. With increase in gas flow rate to fabric surface area ratio (Nm³/hr/m² fabric surface area), the size & the cost of a bag filter

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Q. A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the

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Q. Accidents in chemical plants are mostly due to

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Q. For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.

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Q. A perforated plate has holes of diameter dₙ arranged in a pitch pₕ. Each hole has a tube of I.D. dₜ passing through it. The ligament efficiency is given by

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Q. __________ is the determining factor for the number of bubble caps to be used per tray.

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Q. Pick out the wrong statement about distillation operation

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Q. 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.

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Q. Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscoisty above __________ poise.

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Q. Ratio of tube length to shell diameter for a shell and tube heat exchanger is

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Q. The dust collection efficiency of a cyclone separator

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Q. In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)^0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to

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Q. For a given fluid, as the pipe diameter increases, the pumping cost

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Q. Maximum acceptable total liquid gradient over a tray is about __________ mm.

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Q. In case of a 'thin' pressure vessel, the ratio of its diameter to wall thickness is

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Q. High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

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Q. Bubble cap tray is the most commonly used tray in large distillation column, because

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