DieselShip's Online Content Library

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)

Q2. i) Explain the purpose and applications of using lubricating oils on board. (8)

ii) Name the types of lubricating oil used on ships and mention various properties of same and their significance. (8)

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. (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)

Q5. (a) What is the role of Windlass in the safe operation of Ship? (6)

(b) Explain the following terms used in respect of windlass operation. (10)

(i) Cable lifter

(ii) Brake shoe

(iii) Warp end drum

(iv) Dog clutch

(v) Slipping clutch

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)

Q7. (a) What do you understand by the term 'Boiler' and What is its function on board? (4)

(b) List out the uses of steam on board (4)

(c) Name the types of boilers generally used on ship and explain the differences (4)

(d) State the advantages of water tube boilers over smoke tube boiler (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)

Q9. (a) What do you understand by the term ‘Carnot cycle’ and ‘Reverse Carnot cycle’? (5)

(b) State limitations with cycle. (5)

(c) Explain briefly, absorption type refrigeration cycle with examples using line diagram. (6)