Chemical Engineering Questions on Process Equipment - Set 19 - ObjectiveBooks
Chemical Engineering Questions on Process Equipment - Set 19

Chemical Engineering Questions on Process Equipment - Set 19

Practice Test: Question Set - 19

1. The dust collection efficiency of electrostatic precipitator increases with increase in the
    (A) Gas flow rate
    (B) Electrode area
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)
2. The wall thickness for a large high pressure pipeline is determined by the consideration of the
    (A) Axial tensile stress in the pipe
    (B) Forces exerted by static and dynamic action at bends
    (C) Circumferential pipe-wall tension
    (D) Temperature stresses
3. Which of the following is used to set the diameter of the distillation column?
    (A) Number of theoretical plates
    (B) Static submergence
    (C) Allowable vapor velocity
    (D) Length of straight rectangular weir on cross-flow tray
4. The normal range of velocity of steam in pipes is _________ m/sec.
    (A) 0.1-0.5
    (B) 1-5
    (C) 10-20
    (D) 80-100
5. For pipe flows, head is proportional to _________ at constant capacity (where D = pipe diameter).
    (A) 1/D
    (B) 1/D2
    (C) 1/D5
    (D) D2
6. Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than _________ mm.
    (A) 10
    (B) 20
    (C) 30
    (D) 5
7. Which of the following factors determine the amount of entrainment in a distillation column?
    (A) Plate spacing
    (B) Depth of liquid above the bubble cap slots
    (C) Vapor velocity in the volume between the plates
    (D) All (a), (b) and (c)
8. Longitudinal stress induced in a thin walled cylindrical storage vessel is
    (A) pD/2t
    (B) pD/4t
    (C) pD/3t
    (D) pD/6t
9. Saddle supports are used for supporting _________ vessels.
    (A) Horizontal cylindrical
    (B) Tall vertical
    (C) Thick walled vertical
    (D) Thick spherical
10. In the design of a bag filter, the gas temperature is an important consideration, as it affects the
    (A) Gas density
    (B) Gas viscosity
    (C) Fibre selection
    (D) All (a), (b) & (c)
11. Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is
    (A) More
    (B) Less
    (C) Same
    (D) More or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein
12. With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the _________ decreases.
    (A) Fixed charges initially
    (B) Running cost of cooling water for condenser
    (C) Vapor & liquid load both
    (D) Running cost of steam for reboiler
13. In shell and tube heat exchangers, straight tie rods are used to
    (A) Hold baffle in space
    (B) Fix the tubes in position
    (C) Account for thermal strain
    (D) None of these
14. In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 meters or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed _________ of the column diameter.
    (A) 1/10-1/15th
    (B) 1/5-1/10th
    (C) 1/20-1/30th
    (D) 1/2 to 1/4th
15. The diameter of a propeller agitator used in agitation tank ranges from _________ percent of the tank diameter and its peripheral speed is normally 300 to 500 meters/minute.
    (A) 5 to 10
    (B) 15 to 30
    (C) 40 to 50
    (D) 55 to 75
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