A. Equal to
B. More than
C. Less than
D. Either B. or C.; depends on maximum permissible internal pressure
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 - Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is____________?
A. More
B. Less
C. Same
D. More or less depending upon the pressure & temperature inside the vessel and the nature of
the fluid contained therein - For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for dia of the tank in question), the thickness of the courses of shell_________________?
A. Decreases upwards
B. Increases upwards
C. Remains same throughout
D. May decrease or increase upwards depending upon whether vacuum or positive pressure
would be maintained inside the shell - In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of ________________ mm?
A. 3-5
B. 5-11
C. 8-15
D. 12-18 - In a thin cylindrical shell, the hoop stress is ________________ stress?
A. Radial
B. Circumferential tensile
C. Compressive
D. Longitudinal - The ends of a cylindrical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure ?
A. Flat plate
B. Hemispherical
C. Torispherical
D. Ellipsoidal - Cylindrical shell thickness of rotary drier is generally _______________ mm?
A. 2-3
B. 18-22
C. 6-8
D. 12-15 - A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is________________?
A. Bending
B. Deformation
C. Shear
D. Elongation - Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than ______________ mm?
A. 10
B. 20
C. 30
D. 5 - In case of a ‘thin’ pressure vessel, the ratio of its diameter to wall thickness is_________________?
A. < 10
B. > 10
C. > 20
D. 30
