Q4. (a) With respect to 'plate type' heat exchanger, describe its construction and assembly. Also mention the material used for plates, gaskets, frames etc. (6)
(b) What are the advantages and disadvantages of using plate type heat exchanger? (5)
(c) How leaky plates are determined and identified (5)
Q9. With reference to multi-tubular heat exchangers explain:
(A) How and where impingement attack is likely to occur in the tubes
(B) Why is it desirable that coolant flow rate should not exceed that required to maintain correct fluid temperature
(C) Ample well-shaped water boxes and smooth tube inlets are desirable
(D) Partial obstruction of tube bore is a common cause of tube failure
Q8. A LT cooler of the centralized cooling water system on your ship is showing poor performance. What measures you would initiate to rectify the problem and improve the performance. (16)
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