DieselShip's Online Content Library

Q7. With reference to the 4-stroke medium speed engines:

A. Define the cause and effect of thermal stressing in cylinder Heads, liners and pistons.

B. Explain why thermal stressing are aggravated with increase in cylinder bore.

C. Explain how stress concentration and its effects are relieved by maintenance and operational practices.

Q3. With reference to 2-Stroke Slow Speed Engine:

A. Sketch and describe Main Engine Exhaust Valve.

B. List out a procedure for test of Main Engine Exhaust Valve after overhaul.

Q2. Sketch and describe an overview of the electronic controlled camshaft-less engine with respect to the following operations:

a. Fuel Injection system.                   b. Exhaust valve actuator system.

c. Cylinder lubrication system

Q9. Describe the phenomena of vibration in marine diesel engine. Explain the terms:

(a) Transverse Vibration (b) Torsional Vibration (c) Resonance (d) The role of vibration dampers.

Q2. How explosion occurs in the starting air line of an internal combustion engine and how can the possibility of such an occurrence be reduced? Sketch and describe devices, which may be fitted to reduce the severity of such an explosion. State the attention which air starting valves should be given before stand by.

Q6. What is "virtual tappet" in the hydraulically actuated air spring return exhaust valves, and how is it set. Explain why the damage occurs to the seats of the exhaust valves due to furrowing and cutting and how an incident of "valve drop" leading to extensive damage to running gear can occur.

Q4. State how EACH of the following defects becomes apparent, describe its effect on engine operation or safety and indicate the corrective action required to restore normal engine condition;

A. Leaking air inlet and exhaust valves;            B. Leaking air start valve;

C. Cracked cylinder liner;                              D. Broken piston rings

Q4. While operating at Sea during rough weather conditions, fire sparks have been observed coming out from the chimney. On investigation, it has been observed that the fuel contains considerable quantity of water and sludge. As the Second engineer of the vessel. Explain:
A. Immediate actions taken to rectify the problem.
B. Precautions you take to avoid recurrence of this type of problem.

Q6. With Respect to main engine turbocharger;

A. Explain why cleanliness throughout the turbochargers system is critical to engine performance?

B. Describe in-service cleaning procedure for gas and air sides of a turbocharger indicating safety precautions to be observed?