Chemical Process Equipment Questions & Answers - Set 14 - ObjectiveBooks

Chemical Process Equipment Questions & Answers - Set 14

Practice Test: Question Set - 14

1. For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between _________ times the tank diameter.
    (A) 1 to 1.5
    (B) 2.5 to 3.5
    (C) 4 to 5
    (D) 6 to 8

2. Liquid gradient over the tray results due to the
    (A) Resistance offered to flow of liquids by caps & risers and the flow of gas
    (B) Low gas velocity
    (C) Large plate spacing
    (D) Large reflux ratio

3. Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?
    (A) Sorel-Lewis method
    (B) McCabe-Thiele's method
    (C) Ponchon-Savarit method
    (D) None of these

4. The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from
    (A) 2 to 3
    (B) 3 to 5
    (C) 4 to 8
    (D) 6 to 12

5. Fouling factor must be included in the calculation of overall design heat transfer coefficient, when the liquid
    (A) Containing suspended solids flows at low velocity
    (B) Containing suspended solids flows at high velocity
    (C) Is highly viscous
    (D) Is of high specific gravity

6. The slope of the feed line in distillation operation is given by (where, q = fraction of the feed stream that is liquid.)
    (A) -q
    (B) -q/(1-q)
    (C) -q/(q-1)
    (D) None of these

7. An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by
    (A) An increase in liquid viscosity
    (B) An increase in relative volatility for rectification columns
    (C) Decrease in gas solubility for absorbers
    (D) All (a), (b) and (c)

8. ________ head is the most economical for cylindrical vessels designed for operating at high pressure (> 15 atm.).
    (A) Hemispherical
    (B) Dished
    (C) Ellipsoidal
    (D) Conical

9. Overall tray efficiency of a distillation column is the ratio of the number of
    (A) Overall gas transfer units to the number of ideal trays required
    (B) Ideal trays required to the number of real trays required
    (C) Real trays required to the number of ideal trays required
    (D) None of these

10. Vertical condenser is advantageous to the horizontal condenser from operation point of view, when
    (A) Hydrostatic head is required for refluxing the condensate
    (B) Only the function of condensation is to be carried out
    (C) Sub-cooling of condensate is desired
    (D) Both the functions of condensation & sub cooling are carried out in a single unit

11. Pick out the wrong statement.
    (A) In practical operation, distillation towers having diameter 3-6 meters equipped with bubble cap (round) size of 15 cms are used
    (B) Height of packing in a packed tower is about 3 times the column diameter for raschig rings and about 5 to 10 times the column diameter for saddle packing
    (C) In a sieve tray, the minimum hole diameter is equal to the tray thickness
    (D) In a stainless steel sieve tray, the minimum hole diameter is equal to 10 times the plate thickness

12. The circumferential (hoop) stress in a thin walled cylindrical vessel under internal pressure is
    (A) pd/2t
    (B) pd/4t
    (C) pd/t
    (D) pd/3t

13. The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about _________ times the design pressure.
    (A) 1.5 to 2
    (B) 3 to 4
    (C) 4 to 5
    (D) > 5

14. Pick out the correct statement
    (A) Centre to center distance between two consecutives rivets in a row is called the pitch
    (B) A riveted joint made in overlapping plates is called butt joint
    (C) Hole size drilled in riveted plates is less than the actual size of the rivet
    (D) None of these

15. Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower?
    (A) Size, shape, orientation and surface of the packing particles
    (B) Density and viscosity of fluids
    (C) Fluid flow rates
    (D) All (a), (b) and (c)

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