A. 1
B. 0.85
C. 1.5
D. < 0.5
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 - Seamless pipe is made________________?
A. From rolled strips formed into cylinders and seam-welded
B. By extrusion & casting into static and centrifugal molds
C. By forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer
point and further reducing it by rolling gas drawing
D. Both B. and C. - For turbulent flow (NRe > 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) ?
A. Di, opt = 3.9 Q0.45 ρ0.13
B. Di, opt = 3.9 Q0.45. μ0.95
C. Di, opt = 4.7 Q0.36. μ3.2ρ0.13
D. Di, opt = 3 Q0.36. μ0.88 - For pipe flows, head is proportional to ______________ at constant capacity (where D = pipe diameter) ?
A. 1/D
B. 1/D2
C. 1/D5
D. D2 - Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is ___________________?
A. More
B. Less
C. Same
D. Either A. or B.; depends upon the I.D. of the pipe - For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by____________________?
A. Di, opt = 3 Q0.36 ρ0.18
B. Di, opt = 3.9 Q0.45 ρ0.23
C. Di, opt = 7.6 Q0.36 ρ0.9
D. Di, opt = 3 Q0.36 ρ1.86 μ0.08 - Welded joint efficiency in the design of chemical process equipment is taken as_________________?
A. 0.55
B. 0.75
C. 0.85
D. 0.95 - 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 - Friction factor for turbulent flow in a new pipe is given by____________________?
A. f = 16/NRe
B. f = 0.04/(NRe)0.16
C. f = 0.22 NRe
0.5
D. f = 25/NRe - Pressure drop due to pipe fittings can be estimated by the equation, ΔP/ρ = 4f, (Le/D) (V2/2gc) 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______________________?
A. 5 and 10
B. 45 and 75
C. 180 and 300
D. 300 and 500
