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Process Equipment and Plant Design

Process Equipment and Plant Design
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

0.3
0.01
0.75
0.95

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Process Equipment and Plant Design
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)

E/σ
Σ/E
Σ
E

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Process Equipment and Plant Design
Thin spherical shells subjected to internal pressure, develop __________ stresses.

Both A & B
Neither A nor B
Radial
Circumferential

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Process Equipment and Plant Design
For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser.

Twice
Five times
Half
Thrice

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Process Equipment and Plant Design
For a cylinderical vessel of moderate height, the weld joint efficiency for joints parallel to the cylinderical axis is given as 1.0, while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylinderical vessel, what value of weld joint efficiency should be used?

1
(0.8)0.5
0.8
0.9

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Process Equipment and Plant Design
Le/D for a Tee (used as elbow, entering run) would be around

60
350
200
5

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