For given number of passes, pitch & tube diameter, the maximum number of tubes that can be accommodated in a shell of tripled inside diameter will be ____________ times?

Related Mcqs:

1. In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube) ?

   A. 4(P2 – πd2/4)/πd
   B. (P2 – rd2/4)/rd
   C. 4P2/πd
   D. πd/4P2

2. In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones; because the smaller diameter tubes ______________?

   A. Are easier to clean
   B. Are less prone to fouling
   C. Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
   D. None of these

3. Minimum tube pitch recommended for shell and tube heat exchangers is about _______________ times the outside diameter of the tube?

   A. 1.25
   B. 1.75
   C. 2.5
   D. 3.5

4. Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally ____________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8″)?

   A. Half
   B. Three fourth
   C. Equal to
   D. 1.5 times

5. 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

6. In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by________________?

   A. 4(0.86P2 – πd2/4)/πd
   B. (P2 – πd2/4)/πd
   C. 4(0.86P2 – πd2)/πd
   D. (4P2 + πd2/4)/πd

7. Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger________________?

   A. Permits the use of less tubes in a given shell diameter
   B. Facilitates comparatively easier external cleaning because of large clearance
   C. Permits the use of more tubes in a given shell diameter
   D. Both B. and C.

8. 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

9. If ‘D’ is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of__________________?

   A. D/2 or minimum 2″ to 5D
   B. D/5 or minimum 2″ to 5D
   C. D/5 or minimum 2″ to D
   D. None of these

10. In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of ________________ mm?

    A. 3-5
    B. 5-11
    C. 8-15
    D. 12-18