MCQs: 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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MCQs: The thermal stress in a metallic bar does not depend upon the_____________________?
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MCQs: Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin’s formula as___________________?
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MCQs: Steam is preferred to be used as a heating medium in heat exchangers, because of its_________________?
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MCQs: 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 ____________________?
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MCQs: The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)_________________?
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MCQs: Lug support is meant for supporting _______________ vessels?
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MCQs: In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ?
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MCQs: Optimum reflux ratio in a continuous distillation column is determined by the__________________?
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MCQs: Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about ______________ mm?
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MCQs: Thin spherical shells subjected to internal pressure, develop ______________ stresses?
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MCQs: 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_________________?
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MCQs: A cylindrical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to________________?
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MCQs: The ratio of down take area to cross-sectional area of the tube, for calandria type evaporator ranges from_________________?
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MCQs: The thickness of heat transfer plates used in the plate type heat exchanger ranges from _____________ mm, pressed in a single piece provided with grooves & corrugations?
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MCQs: Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is _____________ the longitudinal stress?
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MCQs: The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the_________________?
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MCQs: For turbine agitator, the impeller diameter is about_________________?
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MCQs: Commercial packed scrubbers are normally designed for a pressure drop range of ______________ mm water column per metre of packed height?
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MCQs: The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is___________________?
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