The thickness of heat transfer plates used in the plate type heat exchanger ranges from _____________ mm, pressed in a single piece provided with grooves & corrugations?

Related Mcqs:

1. The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally _____________ the tube wall thickness?

   A. Equal to
   B. Twice
   C. Four times
   D. Half

2. _____________ heat exchanger is also known as ‘hair pin type’ exchanger?

   A. Double pipe
   B. Finned
   C. Plate type
   D. Regenerative

3. Thickness of the frame of a plate and frame filter as compared to that of plates is___________________?

   A. Less
   B. Same
   C. More
   D. Either A. or B.

4. 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

5. The average velocity in the tubes of a 1-4 heat exchanger is ______________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate ?

   A. 2
   B. 1/2
   C. 4
   D. 1/4

6. A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _______________ percent of the flooding velocity?

   A. 45
   B. 60
   C. 80
   D. 95

7. In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be_________________?

   A. Same as that for fluid flow
   B. Less than that for fluid flow
   C. More than that for fluid flow
   D. D2 – D1 (D1 and D2 are I.D. of inner and outer pipes respectively)

8. Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate ?

   A. Triangular pitch
   B. Square pitch
   C. Diagonal square pitch
   D. Heat transfer rate is independent of tube arrangement

9. 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

10. 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