DieselShip's Online Content Library

Q1. (a) How is fuel (HFO) for a marine diesel engine (main engine) being delivered from a fuel oil storage tank up to the combustion chamber? Explain with a line diagram. (10)

(b) What is the significance of the following:

          (i) Heating arrangement with temperature control. (3)

          (ii) Prevention of air lock in the system. (3)

Q2. (a) Describe the components forming part of a Gear Pump. Explain how pumping is carried out by gear pump? (8)

(b) By suitable drawing describe what is ‘back lash’ and enumerate its importance. How is 'back lash' measured? (4)

(c) What checks will be carried out during overhauls. (4)

Q3. (a) How Leaks are detected and rectified on refrigerating plant? (4)

(b) Describe how suction & discharge valves are tested for tightness? (4)

(c) Describe with an illustration, how refrigerant charging is carried out? (8)
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Q7. a) How leaks are detected and rectified on refrigerating plant? (4)

b) Describe how Suction & Discharge valve are tested for tightness? (4)

c) Describe how refrigerant charging is carried out? (8)

Q4. (a) Describe by drawing a suitable diagram, Bilge water system of an ocean-going ship. Name each part/equipment with its function. (10)

(b) Discuss the commonly associated troubles with the Bilge system and their probable solutions. (6)

Q5. (a) Describe the uses of packed gland seal. What are the machineries they are in use? In a running pump, how the gland packing is lubricated and kept cool? (6)

(b) Describe advantages of using gland packing. (5)

(c) Describe disadvantages of using gland packing. (5)

Q4. Give reasons why each of the following conditions can result in oil being carried over with the water discharge from lubricating oil centrifuges:

a) High throughput of mixture. (6)

b) Abnormally high temperature of mixture. (6)

c) Appreciable accumulation of solids in bowl. (4)

Q6.a) Describe how crankshaft deflections of an auxiliary diesel engine are measured. State how the measurements can be checked for accuracy. Specify with reasons other checks that should be made on the crankshaft. (16)
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Q6.a) Describe how A. E, crankshaft deflections are measured. (6)

b) State how the measurements can be checked for accuracy. (5)

c) Specify with reasons other checks that should be made on the crankshaft. (5)

Q8. (a) There are three auxiliary engines having separate quick closing valves in the fuel supply line. How will you safely test these valves for each of the engines without causing a blackout? Discuss the process with the help of a diagram. (6)

(b) How will you reset the quick closing valves after the test is completed? (4)

(c) Explain the significance of flywheel marking on a four stroke engine. (6)

Q9. Describe reasons and actions to be taken for the following malfunction on auxiliary boiler.

(a) Pilot burner does not fire (4)

(b) Efficiency of boiler is low (4)

(c) Low water level in boiler (4)

(d) Flame failure. (4)