Q. For laminar flow (Nʀₑ < 2100) in steel pipe, the optimum inside pipe diameter is given by

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Q. For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is

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Q. Pressure drop due to pipe fittings can be estimated by the following equation, where, Lₑ = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Lₑ/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around

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Q. 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 cross-section H = hold up of solid.)

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Q. In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)

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Q. For turbulent flow (Nʀe > 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)

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Q. The following ratio, is normally taken as

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Q. Stress-strain diagram for low carbon steel/mild steel is shown below in the Figure. The point 'A' on the Figure represents the

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Q. Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be

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Q. Friction factor for turbulent flow in a new pipe is given by

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Q. In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by

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Q. Pick out the wrong statement.

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Q. In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)

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Q. Souders Brown equation given by the following equation, is used for the calculation of the __________ in a continuous distillation column.

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Q. Lₑ/D for fully open globe value may be around

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Q. Lug support is

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Q. Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.

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Q. With increase in the number of shell passes, the value of Fᴛ

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Q. Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter.

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Q. __________ tray arrangement is recommended for distillation column having diameter upto 4 ft.

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