With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT_________________?

Related Mcqs:

1. 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

2. LMTD correction factor is used in heat exchanger design for____________________?

   A. Double pipe heat exchanger
   B. Multipass shell and tube heat exchanger
   C. Fouling fluids
   D. Counter flow of hot and cold fluids

3. It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than _________________?

   A. 0.99
   B. 0.95
   C. 0.80
   D. 0.55

4. 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

5. The shell side pressure drop in a shell and tube heat exchanger is maximum for _______________ baffle?

   A. Disk and ring
   B. Segmental
   C. Orifice
   D. Independent of the type of

6. 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

7. 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

8. 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.

9. Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about __________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate ?

   A. 2
   B. ½
   C. 4
   D. 8

10. Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle ?

    A. Segmental baffle
    B. Flat plate extending across the wall
    C. Disk type baffle
    D. Helical type baffle