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 the design of a shell and tube heat exchanger, the corrosion allowance ____________________?

   A. Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc.
   B. For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe
   conditions it is 3 mm
   C. For internal cover and tube sheet is provided on both the sides
   D. All A., B. & C.

3. The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from__________________?

   A. 2 to 3
   B. 3 to 5
   C. 4 to 8
   D. 6 to 12

4. 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

5. 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

6. 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.

7. 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

8. 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

9. 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

10. 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