Design Process & Equipment Chemical Engineering Questions - Set 25 - ObjectiveBooks

Design Process & Equipment Chemical Engineering Questions - Set 25

Practice Test: Question Set - 25

1. Lug support is

    (A) The most suitable for thick vertical vessel
    (B) Same as bracket support
    (C) Provided usually for vessels of much smaller height than skirt supported vessels
    (D) All (a), (b) and (c)

2. In inclined long tube vertical evaporators, the tubes are inclined at an angle of

    (A) 15°
    (B) 90°
    (C) 45°
    (D) 60°

3. Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure?

    (A) At the inner surface
    (B) At the mid thickness of the cylindrical wall
    (C) At the outer surface
    (D) None of these

4. Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapor distribution.

    (A) The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation
    (B) Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps
    (C) The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4
    (D) None of these

5. Skirt support is the most suitable for supporting _________ vessels.

    (A) Small horizontal
    (B) Large horizontal
    (C) Tall vertical
    (D) Thick walled

6. Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by McCabe–Thiele method?

    (A) Sensible heat changes for vapor & liquid are negligibly small
    (B) Reflux is not a saturated liquid
    (C) Molar latent heat of the two components are equal
    (D) Heat of mixing of normal liquid is assumed to be zero

7. With increase in the number of shell passes, the value of FT

    (A) Increases
    (B) Decreases
    (C) Remain same
    (D) Remains same, only if the number of tube passes does not change

8. Lessing ring is formed by the addition of a partition across the center of a raschig ring, which results in an area increase of about __________ percent.

    (A) 5
    (B) 20
    (C) 35
    (D) 55

9. What is the value of 'q' for saturated liquid feed to a distillation column?

    (A) 0
    (B) < 1
    (C) 1
    (D) > 1

10. In chemical process equipments, the conical bottom heads used, usually has an apex angle of
    (A) 20°
    (B) 40°
    (C) 60°
    (D) 80°

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