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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