A. Because of simplicity of fabrication
B. For low heat load
C. To obtain higher heat transfer co-efficient and shorter tube
D. To reduce the pressure drop
Related Mcqs:
- Indirect contact heat exchangers are preferred over direct contact heat exchangers, because_________________?
A. Heat transfer co-efficient are high
B. There is no risk of contamination
C. There is no mist formation
D. Cost of equipment is lower - Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is________________?
A. Finned tube heat exchanger with air inside and steam outside
B. Finned tube heat exchanger with air outside and steam inside
C. Shell and tube heat exchanger with air inside tubes and steam on shell side
D. Shell and tube heat exchanger with air on shell side and steam inside tubes - For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?
A. Decreases the pressure drop
B. Decreases the outlet temperature of cooling medium
C. Increases the overall heat transfer coefficient
D. None of these - In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side ______________ the heat transfer rate?
A. Increases
B. Decreases
C. Does not affect
D. May increase or decrease, depends on the type of baffle - The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is ________________?
A. 2
B. 1/2
C. 4
D. 1/4 - In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid _______________?
A. Is inversely proportional to the resistance across which the drop occurs
B. And the wall are proportional to individual resistances
C. And the wall is not related
D. None of these - For a multipass shell and tube heat exchanger, the LMTD correction factor is always________________?
A. 1
B. > 1
C. < 1
D. Between 1 & 2 - Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger ?
A. Tube side pressure drop and the heat transfer rate
B. Convective heat transfer co-efficient
C. Effective tube surface area for convective heat transfer
D. All A. B. and C. - In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to _____________ the velocity head?
A. Twice
B. Four times
C. Square root of
D. Square of - ‘Fouling factor’ used in the design of a multipass shell and tube heat exchanger is a_____________________?
A. Non-dimensional factor
B. Factor of safety
C. Conversion factor for individual film heat transfer co-efficient to overall heat transfer coefficient
D. None of these
