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.
Related Mcqs:
- Joint efficiency (J) for a seamless pipe is_______________?
A. 1
B. 0.85
C. 1.5
D. < 0.5 - 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 - 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 - Brass valves are usually made for pipe sizes ______________ inches?
A. ≤ 1
B. ≤ 2
C. > 2.5
D. > 3.5 - For a given fluid, as the pipe diameter increases, the pumping cost ____________________?
A. Decreases
B. Increases
C. Remain unaffected
D. May increase or decrease depending upon whether the fluid is Newtonian or non-Newtonian - Optimum economic pipe diameter for fluid flow is determined by the____________________?
A. Viscosity of the fluid
B. Density of the fluid
C. Total cost considerations (pumping cost plus fixed cost of the pipe)
D. None of these
