38851. The thermal stress in a metallic bar does not depend upon the
38852. The minimum baffle height should be
38853. For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec.ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches)
38854. To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to
38855. The normal range of velocity of water in pipes is __________ m/sec.
38856. Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle ?
38857. A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design
38858. In a __________ rivetted joint, the number of rivets decreases from the innermost row to the outermost row.
38859. Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about __________ percent of the total thickness.
38860. Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is
38861. Pick out the wrong statement pertaining to the design of the distillation column.
38862. The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is
38863. In distillation columns, bubble caps are held in place over trays by
38864. The buckling tendency of compression members is always in the direction of the
38865. In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ __________ cms.
38866. The average velocity in the tubes of a 1-4 heat exchanger is __________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate.
38867. When one of the fluids is highly corrosive and has fouling tendency, it should
38868. The raio, is normally taken as
38869. A/an __________ is used for changing the direction of a pipeline.
38870. Maximum plate efficiency is achieved in case of __________ flow.
38871. The LMTD correction factor (FT) is defined as the
38872. The clearance between two tubes in a shell and tube heat exchanger is known as 'ligament', whose minimum value is __________ the outside diameter of the tube, but in no case it should be less than 4.5 mm.
38873. The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is
38874. Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from
38875. Value of Peclet number = 0, is the representative of
38876. 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
38877. Removable connection of tubes to tube sheet is called
38878. Stress-strain diagram for low carbon steel/mild steel is shown below in the Fig. The point 'A' on the Fig. represents the
38879. Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around
38880. In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a
38881. The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter.
38882. for couplings and unions would be
38883. What is the slope of the operating line in the rectifying section of a distillation coloumn ?
38884. Stage efficiency for packed tower varies with the
38885. The minimum plate spacing in most of the pertroleum refinery distillation columns (of dia > 3 ft) is normally __________ inches.
38886. Joint efficiency (J) for a seamless pipe is
38887. For a given design of bubble cap, the number of bubble caps to be used per tray is set by the
38888. The shell side pressure drop in a shell and tube heat exchanger is maximum for __________ baffle.
38889. The function of manholes provided in the shell of a distillation column is to
38890. Back-trapping in a distillation column results due to
38891. 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 ?
38892. Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.
38893. The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is __________ cms.
38894. Lap joints are preferred for plates having thickness __________ mm.
38895. In a distillation column, minimum clearance to be maintained betweeen the overflow weir and the last row of the bubble caps is __________ cms.
38896. Which of the following lengths of heat exchanger tubes are normally not used in practice ?
38897. A pipe is generally made of circular cross-section, because a circular cross-section has the
38898. 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
38899. Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be
38900. A cylindrical storage tank can have a self supported conical roof,
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