Chemical Plant Design Process Objective Questions - Set 15 - ObjectiveBooks

Chemical Plant Design Process Objective Questions - Set 15

Practice Test: Question Set - 15

1. In the agitators, the power required will be changed with the increase of diameter of agitator (D) as
    (A) D2
    (B) D5
    (C) D
    (D) D9

2. Which of the following packing materials provides for maximum mass transfer?
    (A) Raschig rings
    (B) Raschig rings
    (C) Cross-partition rings
    (D) All give the same value

3. Pick out the wrong statement.
    (A) Safety valves are provided in heat exchangers for removal of non-condensable
    (B) Liquid metals and Dowtherm are used for very high temperature heating
    (C) In a shell and tube heat exchanger, high pressure fluid is generally routed through the tube
    (D) A loop seal or U-seal is provided in a vertical condenser sub-cooler to prevent quick draining of the condensate

4. The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line)
    (A) S1/S2
    (B) S1.S2
    (C) S2/S1
    (D) 1/S1.S2

5. Pressure drop per tray in the atmospheric distillation column is about _________ psi.
    (A) 0.01 - 0.5
    (B) 0.07 - 0.12
    (C) 0.5 - 1.0
    (D) 1 - 3

6. In a shell and tube heat exchanger, tube side _________ of the mass velocity.
    (A) Heat transfer co-efficient is proportional to 0.8th power
    (B) Pressure drop is proportional to the square
    (C) Both 'a' & 'b'
    (D) Neither 'a' nor 'b'

7. In a thin cylindrical shell, the hoop stress is _________ stress.
    (A) Radial
    (B) Circumferential tensile
    (C) Compressive
    (D) Longitudinal

8. In sieve plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally _________ times the hole diameter to give the required hole area.
    (A) 0.5 to 1.5
    (B) 2.5 to 4.0
    (C) 5 to 10
    (D) 10 to 15

9. The maximum liquid gradient over a tray must not exceed
    (A) 0.5" -1.25"
    (B) 2"-3.5"
    (C) 5"
    (D) Half the tray spacing

10. "A claming section" before the liquid flows into the downcomer is provided to
    (A) Permit release of entrained vapor in the liquid
    (B) Reduce the discharge fluctuation
    (C) Ensure better vapor-liquid contact
    (D) Cool the liquid before it flows down

11. In the downcomer of a distillation column, the minimum recommended residence time is about _________ seconds.
    (A) 2.5
    (B) 5
    (C) 12.5
    (D) 17.5

12. With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will
    (A) Increase
    (B) Decrease
    (C) Remain unaffected
    (D) Increase or decrease depending on the nature of the dust

13. Flanges are connected to pipes by
    (A) Screwing
    (B) Welding
    (C) Brazing
    (D) All (a), (b) and (c)

14. Most of the storage vessels/tanks are made cylindrical, because of the fact that a cylinder
    (A) Has greater structural strength
    (B) Is easy to fabricate
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

15. Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.
    (A) Plate tower is preferred, if interstage cooling is required to remove heats of reaction or solution
    (B) Plate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids
    (C) The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty
    (D) In operations involving large temperature changes. (e.g. distillation), plate towers are preferred over packed towers as the packing may be crushed due to large temperature changes

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