DieselShip's Online Content Library

Q1. (a) What is meant by the term 'purification' and what does it 'separate'? (3)

(b) What are the basic methods of 'separation'? Explain the functioning of ‘purifier' and 'clarifier'? (3)

(c) What is meant by the term 'interface' and what is the role of 'gravity disc' in determining the same? (4)

(d) What is 'NOMOGRAM' and how is the correct 'gravity disc' size selected? (6)

Q2. (a) Draw a simple line sketch of a 'shell and tube' cooler, clearly labelling its parts. (6)

(b) Describe the system. (4)

(c) Name common defects found. (3)

(d) What periodical maintenance needs to be carried out. (3)

Q3. i) What is meant by the term 'corrosion' and how does it occur in nature?  (6)

ii) Name different types of 'wet and dry corrosion' (at least 4 of them) with brief account of their occurrence and suitable preventive measures for their control. (10)

Q1. Write short notes on the following pertaining to the use of copper alloys in seawater systems.

a. Use of copper nickel and formation of protective film for use in seawater. (4)

b. Cavitation. (4)

c. Dezincification. (4)

d. Marine biofouling. (4)

Q5. (a) Name the safety devices fitted on 2 Stage air compressors on ships. Explain their functional purpose as well as location of fitment, using a schematic diagram. (12)

(b) State the maintenance and checks carried out periodically in order to keep them efficient. (4)

Q6. (a) Describe the constructional features of plate type freshwater generator and its operational procedures for fresh water generation. (6)

(b) State the temperatures and pressures at salient points. (4)

(c) State some of the advantages and limitations that exist in using a plate type heat exchanger. (6)

Q7. (a) Why is heat treatment necessary for carbon steel? (6)

(b) Describe the various heat treatment processes and their benefits. (10)

Q5. Describe the functional components of a reefer plant for the domestic refrigeration.
system and temperatures to be maintained in different cold rooms; (8)

i) describe the pressure switches; (2)

(ii) the tubular heat exchanger; (2)

(iii) the Oil separator and, (2)

(iv) the drier system. (2)

Q6. i) Sketch and describe a biological sewage treatment system. (6)

ii) How does the biological Sewage Treatment Plant work? Explain. (6)

iii) What Is understood by the term BOD? What factors affect BOD. (4)