DieselShip's Online Content Library

Q1. Describe following types of lubrication system with suitable examples

(a) Hydrodynamic Lubrication

(b) Hydrostatic lubrication

(c) Elasto-hydrodynamic lubrication

(d) Boundary lubrication

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

(a) Calculated Carbon Aromaticity Inbox (CCAI).

(b) Open flash point and Closed flash point.

(c) The importance of Sodium to Vanadium Ratio.

(d) Octane Number.

Q6. Sketch and describe a “fail safe steering gear” suitable for use on a tanker of more than 100,000 T dwt; Explain the sequence of events that take place when an oil leak takes place in one of the hydraulic pipe lines.

Q1. Sketch a sealing arrangement for an oil-lubricated stern tube. Identify the common forms of seal failure; State how oil loss due to seal failure can be restricted whilst on passage? What is the material used for sealing rings and propeller shaft liner?

Q6. With regards to main transmission shaft flange coupling arrangements:

A. Sketch a hollow type coupling bolt and the hydraulic head/nut and loading rod which are used to fit it.

B. Describe how the bolt is fitted.

C. State the advantage of the hollow coupling bolt as compared to the traditional type of coupling bolt.

Q6. With Respect to Container Ship: -

A. Sketch a ship’s indirect refrigeration system arranged for cooling containers stowed in stacks in the hold;

B. Describe the refrigeration system sketched in (A);

C. State the advantages of the system described in (A) compared with containers with their own refrigeration self-contained units.

Q3. Sketch and describe a boiler water level controller of the float operated type. State the reasons for having this mechanism on the boiler and using this controller and boiler for analogy explain the following terms.

A. Detecting element

B. Servo motor

C. Desired Value

Q9: A new vessel exhibits severe aft end vibration

A. As a Second Engineer Officer, outline a procedure to investigate and identify the source of vibration

B. Suggest possible remedies to obviate / reduce aft end vibration.

Q9. With simple sketch explain working of Direct acting pressure reducing valve and Pilot operated pressure reducing valve. Define state of equilibrium with respect to reducing valves.