DieselShip's Online Content Library

Q1. Oil traces have been found in the condensate tank of an auxiliary boiler:

(a) Describe the procedure to trace the source of contamination (8)

(b) List the contamination with reasons for its occurrence and the precaution to be taken to ensure safety of the boiler (8)

Q2. (a) Describe how leak in a Heat exchanger tube is detected? How to rectify leaky tube? (8)

(b) What are the common methods to enhance heat transfer of heat exchanger? (4)

(c) Describe reasons for poor performance of heat exchanger and actions to rectify the same. (4)

Q3. Where a waste heat boiler is subject to persistent leakage at the tube / tube plate connection, suggest with sketches, methods of effecting a permanent repair. (16)

Q4. (a) What are the routines carried out on a lifeboat winch (6)

(b) What maintenance do the hand brake and Centrifugal brakes require (5)

(c) At what lowering velocity does the centrifugal brake operate (5)

Q5. Give reasons and remedies for the following faults in air compressors.

(a) Excessively hot discharge pipe (5)

(b) Intermediate stage relief valve lifting (5)

(c) Noticeable reduction in free air delivery (6)

Q6. (a) What is Accumulation of pressure test for Boiler and what is its purpose? (6)

(b) Describe the detailed procedure for an Accumulation of pressure test. (10)

Q7. (a) Explain why a purifier is not attaining its rated speed on starting from rest? (8)
(b) How do you select the appropriate Gravity Disc of Purifier? Why is this selection an important element in the purifier operation?

Q8. Explain with a suitable diagram, the components of an auxiliary engine fuel valve? Briefly explain, the process of overhauling and pressure testing the fuel valve? (16)

Q9. (a) What are the basic conditions required to be satisfied, before putting the engine room in Unattended Machinery Spaces (UMS) mode? (8)

(b) List and explain the step by step actions that must be taken in the event of an engine room blackout, while the engine room is unmanned? (8)

Q1. Describe the immediate actions required following a crankcase oil mist detector alarm. List the preventative measures taken to minimize the risk of crankcase explosions. (16)

Q2. Describe the Stern Tube Lubrication System by drawing a schematic diagram and explaining function of each component. (16)

Q3. With respect to the properties of fuel oil, explain the significance of the following terms.

(a) Calculated Carbon Aromaticity Index (CCAI). (4)

(b) The importance of Sodium to Vanadium Ratio. (4)

(c) Sulphur content. (4)

(d) Pour point. (4)

Q4. (a) What causes cavitation in a Centrifugal pump operation? (6)
(b) If the Engine room Bilge pump not taking suction, explore the probable reasons? (6)
(c) Why is a centrifugal pump started with its discharge valve shut? (4)

Q5. (a) How will you align a motor-pump shaft? What are the different methods of alignment that can be used? (8)
(b) Why is the Refrigeration Compressor often belt Driven? (8)

Q6. With respect to centrifuges.

(a) Explain the reasons which shall cause a purifier to overflow (6)

(b) What are reasons that induces vibration in a purifier" (4)

(c) Explain the process of desludging? Why is the purifier amperage an important parameter for the operator? (6)

Q7. (a) What are the reasons for foaming in refrigeration compressor crankcase? (4)
(b) Describe the causes for the following in the domestic refrigeration system: (3*4)
(i) Frequent cut-in and cut-out of the compressor.
(ii) Lub oil low pressure cut-out of the compressor.
(iii) High pressure cut-out of the compressor.
(iv) Frosting in the compressor suction side.

Q8. (a) Explain the term water hammer indicating possible effects on the system. (8)

(b) State how the risk of water hammer may be avoided? (8)

Q9. (a) What is meant by the term ‘critical speed’ and why it can be a problem on ships? (8)

(b) Why is it dangerous to run an auxiliary engine at or near its critical speed for extended periods? (8)