A. 0.55
B. 0.75
C. 0.85
D. 0.95
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Related Mcqs:
- For a cylindrical vessel of moderate height, the weld joint efficiency for joints parallel to the cylindrical 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 cylindrical vessel, what value of weld joint efficiency should be used ?
A. 0.8
B. 0.9
C. 1.0
D. (0.8)0.5 - In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around __________________?
A. 0.5
B. 1.5
C. 2.5
D. 3.5 - The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the _______________ stress?
A. Working
B. Damaging
C. Allowable
D. None of these - Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if___________________?
A. Plain carbon steel and cast iron parts are used
B. Wall thickness is > 30 mm
C. Material of construction is high alloy steel
D. Both B. & C. - Correct use of ‘factor of safety’ is very important in equipment design. It is defined as the ratio of the___________________?
A. Ultimate stress to breaking stress
B. Ultimate stress to working stress
C. Working stress to ultimate stress
D. None of these - In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ _____________ cms?
A. 1.2
B. 0.5
C. 3.8
D. 6.8 - In the design of a paddle agitator, the ratio (paddle dia/tank dia) is normally taken as___________________?
A. 0.1
B. 0.8
C. 0.25
D. 0.5 - A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _______________ percent of the flooding velocity?
A. 45
B. 60
C. 80
D. 95 - Joint efficiency (J) for a seamless pipe is_______________?
A. 1
B. 0.85
C. 1.5
D. < 0.5 - Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 – 1.4 cp and relative volatility < 4) (where ε = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi) ?
A. η = 17 – 61.1 log μ
B. η = 24.6 (Δp/μ)
C. η = 1.66 – 0.25 log μ
D. η = 0.25 log μ – 1.67
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