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Process Equipment and Plant Design

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

Complete back mixing
Laminar flow
Eddy diffusivity = 0
Plug flow

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Process Equipment and Plant Design
The ratio of down take area to cross-sectional area of the tube, for calendria type evaporator ranges from

1 to 1.5
0.5 to 1
2 to 2.5
1.5 to 2

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Process Equipment and Plant Design
The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is

pd/t
pd/4t
pd/3t
pd/2t

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Process Equipment and Plant Design
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.

1 to 5
40 to 50
30 to 40
10 to 20

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Process Equipment and Plant Design
The wall thickness for a large high pressure pipeline is determined by the consideration of the

Forces exerted by static and dynamic action at bends
Temperature stresses
Circumferential pipewall tension
Axial tensile stress in the pipe

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Process Equipment and Plant Design
Wind load consideration in the design of a support can be neglected, when the vessel is

Short (< 2 m) and housed indoor
Tall but empty
None of these
Tall (say 30 metres), but is full of liquid

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