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

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 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

3. Tube wall thickness depends on the corrosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than _____________ mm outside diameter is generally not recommended for fouling fluids ?

   A. 16
   B. 19
   C. 28
   D. 38

4. 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

5. 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

6. 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.

7. 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

8. What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers ?

   A. 6.5 cms
   B. 6.5 mm
   C. Equal to tube I.D
   D. Equal to tube O.D

9. 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

10. 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?

    A. About 9
    B. Considerably more than 9
    C. Considerably less than 9
    D. About 3