Practice Test: Question Set - 09
1. Movement of pipeline caused by thermal expansion is taken care by providing
- (A) Expansion joint
- (B) Changes in its direction
- (C) Change in the shape of pipeline
- (D) All (a), (b) and (c)
2. A binary liquid Azeotropic mixture has boiling point lower than either of the components, when it shows _________ deviation from Raoult's Law.
- (A) Positive
- (B) Negative
- (C) No
- (D) None of these
3. The clearance between two tubes in a shell and tube heat exchanger is known as 'ligament', whose minimum value is _________ the outside diameter of the tube, but in no case it should be less than 4.5 mm.
- (A) Equal to
- (B) Half
- (C) One fourth
- (D) Three fourth
4. In most of the shell and tube heat exchangers, the tube pitch is generally _________ the tube diameter.
- (A) Less than
- (B) 1.25-1.50 times
- (C) 2.5 times
- (D) One-fourth of
5. Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger?
- (A) 75% cut segmental baffle
- (B) 25% cut segmental baffle
- (C) Orifice baffle
- (D) Disk and doughnut baffle
6. Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of
- (A) Preventing the local overstressing of the shell around the opening
- (B) Reduction of discontinuity in shape at the junction
- (C) Making the joint leak proof
- (D) None of these
7. _________ is the determining factor for the number of bubble caps to be used per tray.
- (A) Permissible slot velocity
- (B) Tray diameter
- (C) Liquid load
- (D) Vapor load
8. The center to center distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles?
- (A) To increase the residence time of shell side fluid
- (B) To provide support to the tube bundle
- (C) To reduce the induced vibration in the tubes
- (D) To increase the tube side heat transfer
co-efficient by inducing turbulence
9. The buckling tendency of compression members is always in the direction of the
- (A) Least radius of gyration
- (B) Axis of the load
- (C) Perpendicular to the axis of the load
- (D) None of these
10. In the design of a paddle agitator, the ratio (paddle dia/tank dia) is normally taken as
- (A) 0.1
- (B) 0.8
- (C) 0.25
- (D) 0.5
11. The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area 'A' is given by (where, P = perimeter of the channel in contact with the fluid)
- (A) 4 A/P
- (B) A/P
- (C) 4 P/A
- (D) √A
12. Hoop (circumferential) stress induced in a thin walled 'Horton Sphere' used for the storage of liquid ammonia under pressure is
- (A) pD/2T
- (B) pD/4T
- (C) pD/3T
- (D) pD/6T
13. Accidents in chemical plants are mostly due to
- (A) Inadequate equipment design
- (B) Faulty operating procedures
- (C) Improper layout of the equipments
- (D) Failure of equipments
14. In case of 1.5" heat exchanger tubes, the inside flow area _________ with decrease in BWG.
- (A) Increases
- (B) Decreases
- (C) Remains same
- (D) None of these
15. Liquid redistribution should be done in a packed tower packed with raschig rings every 6 meters or ________ times the column diameter, whichever is lower.
- (A) 2.5-3.0
- (B) 5-7.5
- (C) 10-12.5
- (D) 15-20
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