Q. The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always

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Q. A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is

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Q. Scale up problem in design based on the similarity concept takes into account __________ similarity.

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Q. __________ closure is the weakest enclosure for cylindrical vessels.

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Q. Which of the following efficiencies can be greater than 100% ?

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Q. Optimum economic pipe diameter for fluid flow is determined by the

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Q. Pressure differential maintained across a continuous rotary vacuum filter is in the range of __________ mm Hg column.

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Q. Vertical storage vessels are never supported by __________ support.

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Q. In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be

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Q. Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, σ = yield strength and E = modulus of elasticity)

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Q. 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.

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Q. What is the slope of the feed line, if the feed to a distillation column is a saturated liquid ?

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Q. Filtration rate is affected by the

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Q. Liquid gradient over a tray can be minimised by

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Q. 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

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Q. 'P' is the investment made on an equipment, 'S' is its salvage value and 'n is the life of the equipment in years. The depreciation for rath year by the sum-of years digit method will be

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Q. If an amount R is paid at the end of every year for 'n' years, then the net present value of the annuity at an interest rate of i is

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Q. An investment of Rs. 1000 is carrying an interest of 10% compounded quarterly. The value of the investment at the end of five years will be

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Q. The payback method for the measurement of return on investment

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Q. Annual depreciation costs are constant, when the __________ method of depreciation calculation is used.

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