Questions & Solutions on Chemical Plant Design - Set 22 - ObjectiveBooks

Questions & Solutions on Chemical Plant Design - Set 22

Practice Test: Question Set - 22

1. Fresh water carrying pipelines in chemical industries are colored with _________ color.
    (A) Sea green
    (B) Brown
    (C) Yellow
    (D) Red

2. For a given design of bubble cap, the number of bubble caps to be used per tray is set by the
    (A) Allowable gas velocity through the slots
    (B) Plate spacing
    (C) Diameter of the column
    (D) All (a), (b) and (c)

3. Holes of a sieve tray are arranged in triangular pitch of _________ times the hole diameter.
    (A) 1.5 to 2
    (B) 2.5 to 5
    (C) 5 to 10
    (D) 10 to 15

4. A pipe is generally made of circular cross-section, because a circular cross-section has the
    (A) Higher structural strength
    (B) Lowest surface area requirement for a given volume
    (C) Both (a) & (b)
    (D) None of these

5. Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about _________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate.
    (A) 2
    (B) ½
    (C) 4
    (D) 8

6. In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference
    (A) Is always less than arithmetic average value
    (B) Is always more than arithmetic mean value and the geometric mean value
    (C) Is always less than arithmetic mean value, but more than geometric mean value
    (D) May be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current

7. In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend upon
    (A) Baffle spacing
    (B) Clearance
    (C) Pitch
    (D) None of these

8. Maximum size of the raschig rings used in a packed tower is about _________ of the column diameter.
    (A) 1/10th
    (B) 1/20th
    (C) 1/30th
    (D) 1/50th

9. Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the
    (A) Ultimate stress to breaking stress
    (B) Ultimate stress to working stress
    (C) Working stress to ultimate stress
    (D) None of these

10. Width and depth of grooves in the tube sheet holes normally are _________ inch respectively.
    (A) 1/8 and 1/64
    (B) 1/64 and 1/8
    (C) 1/2 and 8
    (D) 1/2 and 5

11. For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by
    (A) Di, opt = 3 Q0.36 ρ0.18
    (B) Di, opt = 3.9 Q0.45 ρ0.23
    (C) Di, opt = 7.6 Q0.36 ρ0.9
    (D) Di, opt = 3 Q0.36 ρ1.86 μ0.08

12. The shell side pressure drop in a shell and tube heat exchanger is maximum for _________ baffle.
    (A) Disk and ring
    (B) Segmental
    (C) Orifice
    (D) Independent of the type of

13. Pick out the wrong statement.

In an agitated vertical cylindrical reaction vessel, the

    (A) Ratio of liquid depth to tank diameter (i.e. the filling ratio) recommended for most purposes is 1
    (B) Filling ratio for dispersing gas in a liquid is 2 for sufficiently long contact period
    (C) Flat bottom and conical bottom vessels have low agitation efficiency for agitation of heavy solids in liquids
    (D) Dished bottom vessel has very high power consumption

14. Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be
    (A) d
    (B) √d
    (C) √(2πd)
    (D) √(2d)

15. Which of the following material is seldom used for pressure vessel construction?
    (A) Rimmed still
    (B) Mild steel
    (C) Killed steel
    (D) Semi-killed steel

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