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

Related Mcqs:

1. In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement ?

   A. Results in higher shell side pressure drop
   B. Can accomodate less number of tubes for a given shell diameter
   C. Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell
   side fluid
   D. Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer
   co-efficient

2. 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

3. Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is_____________?

   A. More
   B. Same
   C. Less
   D. Twice

4. 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

5. 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.

6. 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

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. A perforated plate has holes of diameter dn arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by_______________?

   A. (ph – dh)/ph
   B. (ph – dh . dt/2)/ph
   C. (ph – dt)/ph
   D. (ph – dh)/dh

9. Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to _____________________?

   A. 5 cms
   B. 40% of the I.D. of the shell
   C. 25 cms
   D. I.D. of the shell

10. 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