Related Questions

Mechanism/phenomenon involved in the improvement of fatigue strength of a material by shot peening is the
A Induction of residual compressive stress on the surface
B Removal of stress concentration from the surface
C Grain refinement
D Surface polishing
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
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 $$\frac{1}{2}$$
C 4
D $$\frac{1}{4}$$
Multipass heat exchangers are used
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
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
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 of the above
'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 co-efficient
D None of these
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
For a multipass shell and tube heat exchanger, the LMTD correction factor is always
A 1
B > 1
C Between 1 & 2

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