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

View solution

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

View solution

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

View solution

Q. Pick out the wrong statement about distillation operation

View solution

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.

View solution

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.

View solution

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

View solution

Q. The dust collection efficiency of a cyclone separator

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. In the design of a paddle agitator, the ratio paddle dia/tank dia is normally taken as

View solution

Q. The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.

View solution

Q. Hole diameter of the seive trays in the distillation column ranges from __________ mm.

View solution

Q. Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor.

View solution

Q. In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

View solution

Q. The minimum shell thickness for tank ≤ 15 metres diameter is limited to __________ mm, for reasons of elastic stability.

View solution