Process Design Equipment Online Questions Answers - Set 11 - ObjectiveBooks

# Practice Test: Question Set - 11

1. Lug support is meant for supporting _________ vessels.
(A) Large horizontal cylindrical
(B) Tall but empty
(C) Small
(D) Thick walled tall

2. Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapor curve) and equilibrium tie lines. As compared to McCabe-Thiele's method, this method
(A) Is more accurate in finding the number of equilibrium stages
(B) Accounts for the enthalpy changes in the process
(C) Facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method
(D) All 'a', 'b' & 'c'

3. In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier cross-section H = hold up of solid.)
(A) Z.H.ρ/L
(B) L/Z.H.ρ
(C) H.ρ/L
(D) Z.H/ρL

4. The safe height (h) to diameter (d) ratio (i.e., h/d) for liquid/petro fuel storage tank of capacity more than 45 kiloliters is less than
(A) 1
(B) 2
(C) 3
(D) 3.5

5. Optimum reflux ratio in a continuous distillation column is determined by the
(A) Maximum permissible vapor velocity
(B) Flooding limit of the column
(C) Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
(D) None of these

6. What is the slope of the operating line in the stripping section of a distillation column?
(A) 0
(B)
(C) > 1
(D) < 1

7. Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about _________ mm.
(A) 10
(B) 50
(C) 100
(D) 200

8. Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have _________ roofs.
(A) Conical
(B) Flat
(C) Floating
(D) Fixed

9. Thin spherical shells subjected to internal pressure, develop _________ stresses.
(B) Circumferential
(C) Both (a) & (b)
(D) Neither (a) nor (b)

10. A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator
(A) Is economical in operation
(B) Employs high velocity, high heat transfer rate and less heating surface requirement
(C) Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle
(D) Both (b) & (c)

11. A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of
(A) 2
(B) 20.8
(C) 20.2
(D) None of these

12. An adequate clearance between the tray and the shell wall of a distillation column is provided to
(A) Drain the liquid from the tray when the unit is not in operation
(B) Allow for thermal expansion and facilitate installation
(C) Avoid back-trapping
(D) None of these

13. Pick out the correct statement.
(A) It is preferred to use a vertical condenser for condensation of vapor from a distillation column without sub-cooling
(B) Draining of residual liquid on tray during shut down of distillation column is facilitated by weep holes
(C) Random packing a packed tower offers the advantage of lower pressure drop and higher throughput of fluids as compared to regular/stacked packing
(D) Risers are generally not connected to the plate in a distillation column by bolts, rivets or welding

14. Safety valves are provided in chemical equipments to guard against excessive
(A) Temperature
(B) Pressure/pressure fluctuation
(C) Turbulence
(D) Noise

15. Pick out the wrong statement:
(A) The tensile strength of a brittle material is less than its compressive strength
(B) The compressive strength of a ductile material is less than its tensile strength
(C) In a thick cylindrical shell, the hoop stress is maximum at the inner radius
(D) The value of crushing load is more than that of buckling load for long columns

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