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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