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) ?

Related Mcqs:

1. 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

2. In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to____________________?

   A. ∞
   B. 1
   C. 20.8
   D. 2

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. 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

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 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

7. 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

8. 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

9. 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

10. 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