DieselShip's Online Content Library

Q1. Sketch and describe a Pneumatic Control System being used on board ship for controlling temperature of Central Cooling System.

(a) Explain what factors might lead to sluggish operation or the Controller.

(b) Explain what is Fail Safe and Fail Set in Pneumatic Control System.

(c) advantages of Pneumatic Control System over Electrical Control System

Q6. With reference to bridge control of a large slow speed propulsion engine.

A. How is starting and reversing achieved?

B. Investigate and suggest remedial action required if the engine,

(i) Fails to turn on air.

(ii) Turns on air but fails to fire on fuel;

(iii) Fails to reverse.

Q2. A. Outline the problems associated with improper lubrication of the liner and piston assembly of a large slow speed engine.

B. Describe and state the causes of each of Clover leafing and Micro-seizure

C. List out the composition of a cylinder oil suitable for an engine operating on VLSFO.

Q5. Sketch and describe the arrangement of a main engine camshaft chain. Describe the repair procedure following fracture of one chain link during operation of the engine. Give possible reasons for the failure and explain how the chain is set initially at the correct degree of tension.

Q5. During normal engine operation, a turbocharger rapidly loses speed and the speed reduction is accompanied by appreciable noise

A. State with reasons the possible causes.

B. Explain in detail how the engine might be safely operated if the damage caused by this incident is such that the turbocharger cannot function.

C. State with reasons the factors which may limit engine operating speed with the turbocharger out of action.

Q5. With reference to mechanical/hydraulic governors explain:

A. Why flyweights are driven at a higher rotational speed than the engine;

B.  How dead band effects are reduced;

C.  How hunting is reduced;

D.  How the output torque is increased.

Q7. Severe engine vibration has recently become evident when the main engine for which you are responsible operates within a certain speed range - State, with reasons, the possible causes of such vibration; State the consequences of operating the engine under such vibratory conditions; Describe the procedure you. As Second Engineer, would implement in order to investigate and rectify the problem.

Q6. With reference to piston rings;

A. State the reasons for breakage;

B. How maintenance and engine operation could minimize breakage;

C. Explain the recent developments in the piston rings to minimize breakage;

Q8. With reference to main boiler super heater arrangements:

(a) Compare the advantages and disadvantages of contra flow with parallel flow design.

(b) How the element tube bank is supported and yet allow for expansion?

(c) How boiler carryover affects super heater effectiveness?