Practice Test: Question Set - 06
1. Baffle spacing is generally _________ the I.D. of the shell.
- (A) More than
- (B) Not greater than
- (C) Not less than one fifth of
- (D) Both (b) and (c)
2. A minimum clearance of about _________ mm is maintained between the distillation column wall and the bubble cap.
- (A) 19
- (B) 38
- (C) 67
- (D) 95
3. The dust collection efficiency of a cyclone separator
- (A) Decreases with increase in gas flow rate
- (B) Is inversely proportional to the mass of the dust particle
- (C) Is directly proportional to the radius of the dust particle path
- (D) None of these
4. Seamless pipe is made
- (A) From rolled strips formed into cylinders and seam-welded
- (B) By extrusion & casting into static and centrifugal molds
- (C) By forging a solid round, piercing it by simultaneously rotating
& forcing it over a piercer point and further reducing it by rolling gas
drawing
- (D) Both (b) and (c)
5. Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always
- (A) Less than arithmetic mean value
- (B) More than arithmetic mean value
- (C) More than geometric mean value
- (D) Both (b) & (c)
6. For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is
- (A) d1/(d1
+ d2)
- (B) d2/(d1
+ d2)
- (C) (d1 + d2)/d1
- (D) (d1 + d2)/d2
7. In distillation columns, bubble caps are held in place over trays by
- (A) Rivets
- (B) A hold down bar
- (C) Bolts
- (D) Both (b) and (c)
8. Optimum economic pipe diameter for fluid flow is determined by the
- (A) Viscosity of the fluid
- (B) Density of the fluid
- (C) Total cost considerations (pumping cost plus fixed cost of the pipe)
- (D) None of these
9. The necessary wall thickness for a metallic storage vessel is a function of the
- (A) Ultimate tensile strength (or yield point) of
the material and operating temperature
- (B) Operating pressure and welding/joint efficiency
- (C) Diameter of the vessel
- (D) All (a), (b) and (c)
10. The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is
- (A) 0.25
- (B) 0.50
- (C) 0.75
- (D) 1.25
11. Cylindrical shell thickness of rotary drier is generally _________ mm.
- (A) 2-3
- (B) 18-22
- (C) 6-8
- (D) 12-15
12. Pick out the wrong statement pertaining to 'Horton sphere' used for the storage of liquid ammonia.
- (A) Diameter of Horton sphere is normally 6 to 25 meters and it is
supported by 6 to 12 nos. tubular or rolled section column
- (B) Thickness of spherical shell is half that of the
cylindrical vessel under same operating pressure condition. Besides, the ratio
of surface area to volume is less for sphere than any other shape; hence
insulation required is less
- (C) Horton sphere is used for the storage of gases and volatile liquid
at a moderate pressure of 1 to 10 kg/cm2
- (D) Horton sphere is used for the storage of liquid at sub-zero temperature
at very high pressure upto 200 kg/cm2
13. The length of straight rectangular weir used on cross-flow trays is generally _________ the column diameter.
- (A) 0.6-0.8 times
- (B) Equal to
- (C) Twice
- (D) 2 ft irrespective of (for column > 3 ft diameter)
14. Pressure differential maintained across a continuous rotary vacuum filter is in the range of _________ mm Hg column.
- (A) 50 to 100
- (B) 100 to 150
- (C) 250 to 500
- (D) 600 to 700
15. In a shell and tube heat exchanger, the clearance of the tube is generally
- (A) Not less than one-fourth of the tube diameter or 3/16"
- (B) More than the tube diameter
- (C) Equal to the tube diameter
- (D) More in case of triangular pitch as compared to the square pitch
tube layout
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