Generally, elliptical dished heads____________________?

A. Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for
pressure vessels operating above a pressure of 1.5 MN/m2
B. Resist half the pressure rating compared to hemi spherical head provided on the cylindrical
shell of the same thickness and diameter
C. Are approximately as strong as seamless cylindrical shell having the corresponding I.D and
O.D
D. All A., B. and C.

Related Mcqs:

_____________ dished head is the strongest of all?
A. Hemispherical
B. Elliptical
C. Torispherical
D. None of these
A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the__________________?
A. Central dished section and corner torus section
B. Corner torus section and central dished section
C. Central dished section and straight flange section
D. Straight flange section and corner torus section
Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about ______________ percent of the total thickness?
A. 1 to 5
B. 10 to 20
C. 30 to 40
D. 40 to 50
Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than ______________ of the head?
A. 6% of I.D.
B. 3 times the thickness
C. Either A. or B., whichever is larger
D. Either A. or B., whichever is smaller
Baffle spacing is generally _________________ the I.D. of the shell ?
A. More than
B. Not greater than
C. Not less than one fifth of
D. Both B. and C.
The length of straight rectangular weir used on cross-flow trays is generally ________________ the column diameter ?
A. 0.6-0.8 times
B. Equal to
C. Twice
D. 2 ft irrespective of (for column > 3 ft diameter)
The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally _____________ the tube wall thickness?
A. Equal to
B. Twice
C. Four times
D. Half
Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than ______________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop?
A. 25
B. 50
C. 75
D. 150
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
Needle valves are generally not used for___________________?
A. Very large diameter pipes
B. High pressure throttling service
C. Very accurate flow control
D. Smaller sizes of pipe