Related Mcqs:

1. Ratio of tube length to shell diameter for a shell and tube heat exchanger is________________?

   A. 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers
   B. 4 : 1 to 8 : 1 for liquid-liquid exchanger
   C. < 4 : 1 for gas-gas exchangers
   D. Both B. & C.

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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