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