DieselShip's Online Content Library

Q1. (a) How does fouling affect the performance of a heat exchanger? (4)

(b) Describe the types of plugs used to plug the ends of a leaky heat exchanger tubes. (6)

(c) What is a differential pressure gauge? Where is it used? (6)

Q2. (a) Why are centrifugal pumps used for the sea and cooling water services with marine diesel engines? What are their drawbacks? (6)

(b) What do you understand by the term 'pump characteristics'? (6)

(c) What is net positive suction head? (4)

Q3. (a) With a sketch of the fuel line diagram explain the bunkering process and the checks to be undertaken before bunkering, during and after completion of the bunkering operation. (10)

(b) What are the safety features of the fuel line? (6)

Q4. (a) Explain the function of an 'eductor' with the aid of a sketch. Where do you find an eductor system on a ship? Give two examples. (8)

(b) Explain the working principle of an eductor. What are the operational challenges that may affect the performance of the eductor? (8)

Q5. (a) How is the tensile strength of a metal determined? What other information is obtained when a tensile test is made? (8)

(b) Name the non-destructive tests used during the manufacture and service of a diesel engine components and associated equipments. Give an example of where each test is used. (8)

Q6. Write short notes to explain the following fittings/devices used in engine room, and their applications: (16)

(a) Gate valve

(b) Butterfly valve

(c) Quick Closing valve

(d) Valve actuators

Q7. Sketch and describe how the torque is transmitted to the rudder stock in a rotary vane steering gear. (16)

Q8. With reference to the marine boiler operation, answer the following:

(a) What do you understand by ‘accumulation of pressure’ test? Explain. (8)

(b) Why is a Boiler water circulating pump required for ships fitted with an Exhaust gas Economiser? Explain with a line diagram. (8)

Q9. Explain any four of the following:

(a) Difference between crude oil washing and tank cleaning (4)

(b) Dynamic positioning system and its types (4)

(c) Deaeration tank in the HT Jacket Cooling Water System (4)

(d) Thermostatic expansion valve (4)

(e) Proportional controller with examples (4)

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)

Q5) (a) Describe the effects of taking fresh water from the shore as feedwater for auxiliary boilers. (5)

(b) Describe the measures taken to reduce these effects. (5)

(c) What is the purpose of deaerator in the boiler feed water system? How is the deaeration achieved? (6)

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)