DieselShip's Online Content Library

Q6. With reference to the fuel standards ISO-8217-2017 discuss the amendments made as compared to its previous edition. Explain the significance of the following:

(a) Pour point, cloud point and cold filter plugging point.

(b) Cat fines

(c) Fatty Acid methyl Easter

(d) Dissolved H2S in fuel.

Q8. How do preventive, predictive and corrective maintenance strategies differ in the management of ship equipment, and what are the advantages and disadvantages of each approach in ensuring the reliability and longevity of machinery onboard ship? (16)

Q1. a) Describe the key phases and microstructures present in the iron-carbon equilibrium diagram and explain their significance in the heat treatment of steel. (8)

b) How do the different regions of the iron-carbon diagram influence the mechanical properties of steel, such as hardness, toughness, and ductility? Provide examples of how specific compositions and heat treatments can achieve desired properties. (8)

Q4. a) As per SOLAS regulations, what checks and tests must be carried out on the steering gear system before the ship’s departure from port? Explain the procedures involved and the documentation required. (8)

b) Explain the construction, working, and purpose of hunting gear in a steering gear system. What are the consequence of its failure? (8)

Q4. With reference to fuel oil viscosity:

(a) Explain why correct fuel oil viscosity is necessary

(b) Describe TWO methods for the measurements of viscosity that are suitable for the inclusion into a pneumatic or electronic control system;

(c) State, with reasons, a control action for a viscosity controller.

Q3. With reference to propeller shaft alignment:

a) state the objectives of a satisfactory alignment

b) state the conditions that must be met to achieve satisfactory alignment

c) explain what is meant by fair curve alignment.

d)Define "sag and gap" in shaft alignment calculation.

Q7. Explain the purpose and main components of an air conditioning system used on ships. Describe the layout and working of the system with the help of a neat diagram. Discuss the function of the unloader in the compressor and its importance during system operation. (10)

(b) Name the thermodynamic cycle on which the marine air conditioning system operates. Explain this cycle using a pressure-enthalpy (P-h) diagram and describe the role of each component in the cycle. (6)

Q6. With reference to keyless propellers explain:

a) Why keys and keyways have been eliminated

b) How angular slip is avoided

c) Why mounting upon and removal of a propeller shaft requires a different technique than that employed for propeller with keys.

d) State with reasons why use of wedges and jacks are not advisable when removing the propeller from its shaft

Q8. A. Explain the action of EACH of the following metallurgical mechanism:

(i) Creep;          (ii) Brinelling;   (iii) Fretting;     (iv) Fretting corrosion;

B .State, with reasons, where EACH of the mechanisms in occur in ship propulsion System.