Process Equipment and Plant Design Questions

• Welded joint efficiency in the design of chemical process equipment is taken as
• Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.
• The equivalent diameter for pressure drop is __________ that for heat transfer.
• Most of the storage vessels/tanks are made cylindrical, because of the fact that a cylinder
• Safety valves are provided in chemical equipments to guard against excessive
• Pick out the correct statement
• For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser.
• A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of
• The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally __________ the tube wall thickness.
• In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for
• Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the
• What is the value of 'q' for saturated vapor feed to a distillation column?(where q = fraction of the feed stream that is liquid.)
• for 90° elbow (medium radius) and 90°square elbow would be respectively around
• For a 25 mm hole drilled in plates to be rivetted, the shank diameter of the rivet should be __________ mm.
• In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes
• __________ closure is the weakest enclosure for cylindrical vessels.
• In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around
• In a pressure vessel containing multiple openings of various dimensions at different parts, stress concentration at the edges of the opening is maximum which becomes negligibly small beyond the area covered by __________ times the hole diameter.
• Pick out the wrong statement.
• Which of the following efficiencies can be greater than 100%?