Related Questions

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
A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires
A Less heating surface
B More space
C Lower maintenance cost
D None of these
In a heat exchanger, floating head is provided to
A Facilitate cleaning of the exchanger
B Increase the heat transfer area
C Relieve stresses caused by thermal expansion
D Increase log mean temperature gradient
In a shell and tube heat exchanger, floating head is used for
A Large temperature differentials
B High heat transfer co-efficient
C Low pressure drop
D Less corrosion of tubes
In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used
A In low range of temperature differences
B In high range of temperature differences
C Because of its low cost
D To prevent corrosion of the tube bundles
LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is
A Higher
B Lower
C Same
D Depends on the area of heat exchanger
If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is
A 1
B 2
C $$\frac{1}{2}$$
D 4
In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.
A Once
B Twice
C Thrice
D Four times
In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.
A Same
B Less
C Greater
D None of these
LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is
A 0
B 1
C >1

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