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Process Equipment and Plant Design

Process Equipment and Plant Design
For a 25 mm hole drilled in plates to be rivetted, the shank diameter of the rivet should be __________ mm.

23
25
26
27

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Process Equipment and Plant Design
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.)

L/Z.H.ρ
H.ρ/L
Z.H.ρ/L
Z.H/L.ρ

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Process Equipment and Plant Design
A cylinderical 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

5 mm
6 mm
10 mm
8 mm

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Process Equipment and Plant Design
Rotary driers are most economically designed for the number of heat transfer units (HTU) from

1.5 to 2.5
0.01 to 1
5 to 10
10 to 20

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Process Equipment and Plant Design
Value of Peclet number = 0, is the representative of

Complete back mixing
Laminar flow
Plug flow
Eddy diffusivity = 0

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Process Equipment and Plant Design
The necessary wall thickness for a metallic storage vessel is a function of the

Operating pressure and welding/joint efficiency
Diameter of the vessel
Ultimate tensile strength (or yield point) of the material and operating temperature
All of these

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