DieselShip's Online Content Library

Q1. Considering effect of corrosion, describe choice of material for following with reasons.

(a) Sea Water pump body. (4)

(b) Sea Water Pump Impeller. (4)

(c) Sea Water Pump Shaft. (4)

(d) Filter boxes (4)

Q1. (a) Sketch a block diagram showing a bridge control system for propeller pitch, engine speed and load. (8)

(b) Describe the operation of the system sketched in (a). (4)

(c) What are the requirements to be fulfilled on an UMS classed vessel for operating "unmanned Engine Room watch." (4)

Q2. (a) Describe Hydraulic Jack for large nut tightening used onboard; Draw diagrammatic Sketch of the jack describing each part. (8)

(b) Describe procedure for tightening and unscrewing the nut with Hydraulic Jacks. (8)

Q2. During your watch, main engine operation suddenly becomes erratic with speed varying widely even though fuel control remains at the value originally set:

a) State with reasons the possible cause of this behavior (8)

(b) Explain in detail how this cause can be traced, and the problems rectified. (8)

Q3. (a) What type of Destructive testing methods are in use? Describe the methods in brief. (8)

(b) Describe advantages of destructive testing. (4)

(c) Describe disadvantages of Destructive Testing. (4)

Q3. (a) State why jacketed fuel pipes are employed for protection of high-pressure fuel delivery lines between the high-pressure fuel pumps and fuel injectors. (4)

(b) Sketch and describe such a jacketed pipe arrangement and show how high-pressure pipe failure is indicated. (12)

Q4. Describe the effects upon the auxiliary engine of running with the following defects.
(a) Incorrect tappet (4)

(b) Carbon encrusted injector nozzle (4)

(c) Fouled turbocharger (4)

(d) Worn out fuel pump cams Indicate how the defect may be detected and the rectifying action required in each case. (4)

Q4. Describe following metal finishing processes and objectives:

a) Honing (4)

b) Lapping (4)

c) Polishing (4)

d) Buffing (4)

Q5. (a) Describe with a diagram the sea water cooling system of your ship. Name each part and its function. (12)

(b) Describe defects associated with Sea water Cooling system of your ship. (4)

Q5. Sketch and describe a cylinder liner used for a 2-stroke main engine with cross flow scavenging. Show the provision made for sealing cooling water and exhaust gases. (16)

Q6. (a) Sketch and describe the operation of the domestic refrigeration system of a ship using freon 22 gas as refrigerant. (8)

(b) Describe the causes for the following in the domestic refrigeration system. (8)

(i) Frequent cut-in and cut-out of the compressor

(ii) Compressor running hot

(iii) High pressure cut out of the compressor

(iv) Frosting in the compressor suction side.

Q6. (a) Sketch and describe a fuel oil system of a large diesel engine, from settling tanks to main engine fuel injectors. (10)

(b) Also, comment on the importance of,

(i) Heating arrangement with temperature control (2)

(ii) Prevention of air lock in the system (2)

(iii) Purification of fuel (2)

Q7. Write short notes on the following:

(i) Low output of a fresh water generator (4)

(ii) Fuel oil purifier overflowing (4)

(iii) Alarming rise in engine room bilge level at sea (4)

(iv) Frequent shearing of pump-motor coupling pad (4)

Q8. (a) What are the effects of adding mass to draught and trim of a ship? (6)

(b) The half ordinates of the waterplane area of a ship of 8200 t displacement, 90 m long are 0, 2.61, 3,68, 4.74, 5.84, 7.00, 7.30, 6.47, 5.35, 4.26, 3.16, 1.88 and o m respectively. It floats in sea water of 1.024 t/m3. Calculate the change in mean draught when moving into water of 1.005 t/m3 (10)

Q7. What is specific fuel consumption of a diesel engine? Why is it necessary to specify it and how will you check this for the large diesel engine of your vessel. (16)

Q8. Where a waste heat boiler is subject to persistent leakage at the tube/tube plate connection, state with reasons:

(a) The possible causes of such leakage (6)

(b) The effects of this leakage (5)

(c) Methods of effecting a permanent repair. (5)

Q7. With reference to the construction of a turbocharger, sketch and describe

a) The rotor bearing and it's method of lubrication. (6)

b) Labyrinth seal and explain how such a seal work. (6)

c) Impeller and diffuser. (4)

Q9. With reference to Main Engine Turbo charger

(a) What are the indication of water leakage in turbo charger casing. (8)

(b) Precaution to be taken during water washing at sea (8)

Q6. Sketch and describe the operation of a crankcase oil mist detector. What operational maintenance does this instrument require for efficient performance. (16)