Process Equipment Design MCQ - Set 12 - ObjectiveBooks

Practice Test: Question Set - 12

1. Theoretically calculated diameter of the stripping section of the continuous rectification column is _________ that of the enriching section.
(A) Less than
(B) More than
(C) Same as
(D) Either more or less (depending upon relative volatility)

2. A cylindrical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to
(A) 5 mm
(B) 6 mm
(C) 8 mm
(D) 10 mm

3. Floating head heat exchangers are used for the
(A) Heat transfer between corrosive fluids
(B) Cases where temperature difference between the shell and the tubes is more (>50°C)
(C) Co-current heat transfer systems
(D) Counter-current heat transfer systems

4. The ratio of down take area to cross-sectional area of the tube, for calandria type evaporator ranges from
(A) 0.5 to 1
(B) 1 to 1.5
(C) 1.5 to 2
(D) 2 to 2.5

5. Welded joint efficiency in the design of chemical process equipment is taken as
(A) 0.55
(B) 0.75
(C) 0.85
(D) 0.95

6. The thickness of heat transfer plates used in the plate type heat exchanger ranges from _________ mm, pressed in a single piece provided with grooves & corrugations.
(A) 0.3 to 0.8
(B) 1.25 to 3.125
(C) 3.5 to 7.0
(D) 8 to12

7. In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)
(A) Aa = Sa
(B) 1.2 Aa = 1.2 Sa
(C) Sa = 1.5 Aa
(D) Aa = 1.5 Sa

8. Pick out the wrong statement.
(A) Riveting provides a permanent fastening method
(B) The joint made by overlapping of one plate over the other, and then riveting the two plates together with two rows of rivets is called 'double riveted butt joint'
(C) Shank diameter of the rivets should be less than the size of the hole drilled in the plate for riveting
(D) The efficiency of a riveted joint is the ratio of the strength of the riveted joint to the strength of the solid plate

9. Needle valves are generally not used for
(A) Very large diameter pipes
(B) High pressure throttling service
(C) Very accurate flow control
(D) Smaller sizes of pipe

10. Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is _________ the longitudinal stress.
(A) Half
(B) Equal to
(C) Twice
(D) Eight times

11. Larger depth of liquid on the trays of a distillation column
(A) Leads to high tray efficiency
(B) Results in higher pressure drop per tray
(C) Both (a) & (b)
(D) Neither (a) or (b)

12. The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the
(A) Equal sized reactors are the best
(B) Smaller reactor should come first
(C) Larger reactor should come first
(D) None of these

13. In a cylindrical vessel subjected to internal pressure, the longitudinal stress σL and the circumferential stress, σn are related by
(A) σh = 2 σL
(B) σh = σL
(C) σh = σL/2
(D) No relation exists

14. For turbine agitator, the impeller diameter is about
(A) 0.3 to 0.5 d
(B) 0.1 to 0.2 d
(C) 0.65 to 0.85 d
(D) 0.95 d

15. Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)
(A) 0.2 D
(B) 0.5 D
(C) 0.66 D
(D) 0.80 D

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