Related Questions

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
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 parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is
A Minimum
B Maximum
C Zero
D Infinity
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type
A Parallel flow with equal heat capacities
B Counter flow with equal heat capacities
C Counter flow with unequal heat capacities
D Parallel flow with unequal heat capacities
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
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
Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling?
A Square pitch
B Triangular pitch
C Diagonal square pitch
D None of these

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