Practice Test: Question Set - 26
1. Pick out the wrong statement pertaining to the design of a basket type evaporator.
- (A) It is used for high viscosity liquor having large rate of scaling
- (B) The tube bundle is suspended on bracket
- (C) There is no central downtake
- (D) Downtake is formed by the annular space between
the bundle and the shell
2. Diameter of bubble caps used in high pressure columns is _________ as compared to that used in identical vacuum columns.
- (A) Less
- (B) More
- (C) Same
- (D) Either (a) or (b); no generalization can be made
3. Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than _________ kiloliters.
- (A) 20
- (B) 30
- (C) 45
- (D) 85
4. In packed absorption tower, onset of flooding usually occurs at a pressure drop of about _________ mm of water column per meter height of packing.
- (A) 25-50
- (B) 50-75
- (C) 200-250
- (D) 750-1000
5. In a heat exchanger, shell side fluid velocity can be changed by changing the tube
- (A) Layout
- (B) Pitch
- (C) Both (a) & (b)
- (D) Neither (a) nor (b)
6. Which of the following lengths of heat exchanger tubes are normally not used in practice?
- (A) 2.5 meters
- (B) 6 meters
- (C) 10 meters
- (D) 0.5 meter
7. Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about _________ kcal/hr.m2.°C.
- (A) 1250
- (B) 2500
- (C) 7500
- (D) 15000
8. The operating pressure drop range in a bag filter is about _________ mm water gauge.
- (A) 50-150
- (B) 5-10
- (C) 500-1500
- (D) 1500-2500
9. The safe distance of habitation from a hazardous chemical plant (TLV of its product < 1000 ppm) should be about _________ kms.
- (A) 1
- (B) 5
- (C) 15
- (D) 25
10. (Le/D) for fully open globe value may be around
- (A) 10
- (B) 25
- (C) 75
- (D) 300
11. In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hi) vanishes after a Reynold number of
- (A) 1000
- (B) 3000
- (C) 5000
- (D) 10000
12. The value of fouling factor depends upon the
- (A) Characteristic of process fluid
- (B) Velocity of process fluid containing suspended solids
- (C) Suspended solids in the fluid
- (D) All (a), (b) and (c)
13. Pick out the wrong statement pertaining to a shell and tube heat exchanger.
- (A) The minimum value of baffle spacing is 50 mm
- (B) The maximum value of baffle spacing is equal to the I.D. of the
shell
- (C) The maximum unsupported tube span is generally about 75 times tube
diameter, but is reduced to about 60 times for aluminium, copper & alloys
of these
- (D) Disk and doughnut baffle is the most commonly
used baffle
14. Bracket supports are the most suitable for supporting _________ vessels.
- (A) Thick walled vertical
- (B) Horizontal
- (C) Thin spherical (e.g. Horton sphere)
- (D) None of these
15. In perforated plate towers, the
- (A) Hole sizes may be around 1/8" or 3/16"
- (B) Total hole area may be around 6 to 15% of tower cross-sectional area
- (C) Pressure drop is less compared is similar bubble
cap towers
- (D) All (a), (b) and (c)
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