Chemical Engineering MCQs

Generally, elliptical dished heads

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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 .
resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter.
are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D.
all (a), (b) and (c)
✅ The correct answer is option D.

Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids.

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16
19
28
38
✅ The correct answer is option B.

Spherical shaped pressure vessel is considered to be the most ideal, because it can

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withstand higher pressure for a given metallic shell thickness.
be fabricated very easily.
be designed without wind load considerations.
be supported very easily.
✅ The correct answer is option A.

Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of __________ times the paddle diameter.

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0.1 to 0.25
0.3 to 0.5
0.5 to 0.6
0.65 to 0.80
✅ The correct answer is option A.