Q1. (a) Describe the procedure for taking crankshaft deflection of Auxiliary Engine, explaining all precautions that must be observed (8)
(b) Explain what deflection readings actually mean and suggest the action which must be taken should readings be outside values recommended by the engine manufacturer. (8)
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) Describe in detail a four stroke cycle. Why it is called so? (5)
(b) Draw 4-Stroke engine cycle. With crank position of each stroke. (6)
(c) What is scavenging? Show the Scavenging step in the cycle diagram, what is its importance. (5)
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. Describe following terms with respect to Diesel Engine with suitable diagram: (a) Natural aspiration (4)
(b) Scavenging (4)
(c) Supercharging (4)
(d) Types of Super charging in two stroke engine. (4)
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)
Q4. With reference to lubricating oil:
(a) Explain why oil employed in the crankcase of a trunk piston engine differs in its properties
from that employed in the crankcase of a crosshead engine. (6)
(b) List FOUR effects of bacterial attack on crankcase oil.
(c) Explain the action which must be taken if bacterial attack of the crankcase oil is detected. (4)
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) What is the definition of the following terms: (6) (i) Indicated Power (ii) Specific fuel oil consumption (iii) Brake power (iv) Mechanical efficiency (v) Thermal efficiency
(b) What is an Indicator diagram of diesel engine? Draw a diagram and show different points related to Diesel Engine power measurement. (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. Explain how leakage of the undermentioned valves may become apparent to watchkeepers and state the effects on engine operation. Describe the immediate and subsequent action Which might be necessary in each case. (a) Exhaust valve (b) Fuel valve (c) Air Starting valve
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. Make a report to the Chief Engineer of your vessel about malfunctioning of low lub oil pressure alarm for the auxiliary engine, observed during your watch, with special emphasis on the possible consequences. (16)
Q7. (a) Why is heat treatment necessary for carbon steel? (6)
(b) Describe the various heat treatment processes and their benefits. (10)
Q8. (a) Describe crank case Oil Mist Detector and the principle of its operation. (8) (b) Draw crank case explosion relief door and name the parts. State pressure setting of the door. (8)
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)
Q9. With reference to an auxiliary diesel engine: (a) Explain how a crankcase explosion may occur (4) (b) Identify the indications of poor combustion (4)
(c) State FOUR reasons for poor combustion (4)
(d) Describe the effects on engine condition and maintenance by allowing poor combustion to continue (4)
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)
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