DieselShip's Online Content Library

Q1. With respect to Windlass and deck Machinery:

(a) Describe the principle of coil-operated brake suitable for winches and other deck machinery.

 (b) Explain with suitable sketches how the windlass is relieved of strain when riding at anchor.

Q6. With reference to electro-hydraulic steering gears:

A. Explain in terms of control parlance, the function of the “Hunting gear”;

B. Explain the consequences if the standby pumping unit is motored;

C. State TWO methods employed to prevent the standby hydraulic pump being motored by the operating unit.

Q9. Give reasons why each of the following features is considered desirable in air compressors. A. Smooth air passages with minimum obstruction at valves; B. Minimum clearance volume C. Multi-tubular heat exchangers; D. Generous size of suction filter.

Q4. Briefly Discuss the effects of following on corrosion: (16)

a) Dissolved Oxygen

b) Hydrogen Ion concentration

c) Temperature

d) Velocity

Q1. A. Explain the ideal design requirements of a ships propeller; B. briefly describe the propeller maintenance that should be carried out to prevent the fuel being wasted.

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.

Q5. GHG Ratings of ships have become new industry norms-Discuss various types of GHG Ratings applied to international shipping, with special focus on the role of second engineers in improving GHG ratings of ships.

Q8. Explain why, in spite of accurate alignment under static conditions use of flexible couplings and copious supply of lubricant, main reduction gearing in still subject to pitting, scuffing and other tooth damage; B. Discuss the significance of viscosity in relation to the function of marine turbine oils as used in main propulsion installations, stating how the viscosity is controlled and what could cause it to change in service.

Q9. Use of Controllable Pitch Propellers (CPP) is on the increase for main propulsion.

What advantages this has over fixed pitch propellers. Discuss the principles involved in CPP propulsion naming important components of hydraulically operated system. What fail safe & alarm systems are provided. (16)