MEK Motor MEO Class 2 Written Question (MAR 2023)

EXAMINATION OF MARINE ENGINEER OFFICER

    MARINE ENGINEERING KNOWLEDGE (MOTOR)

                          M.E.O. CLASS II

            Time: 3 HOURS Total Marks - 100

Q1. A) Explain with a simple sketch the principle of a hybrid turbo charger, what are the advantages? What are the challenges? 

b) Discuss the statement in detail, “Hybrid turbo charger will improve overall plant efficiency” 

Q2. Control air is essential for shipboard machinery pneumatic systems for efficient operation, discuss the need of quality air for pneumatic systems in present modern machinery 

(b) What are the different types of air dryers? Which dryer is more energy efficient and why.

Q3. As second engineer you have been requested to obtain a set of indicator card from the large slow speed engine of a recently purchased second hand ship.

A. Describe your initial checks and preparations;

B. State with reason the types of card you would consider necessary and explain the procedure for obtaining these;

C. State in order of importance the additional information required with the card;

D. State your procedure for analysis of the cards and obtaining cylinder powers.

Q4. 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.

Q5. Accidental grounding of the ship in which you are second engineer has occurred while on passage between ports.

a) Describe your immediate concerns as attempts are made to re-float the ship using the main engines

b) Following failure to re-float and assuming operation on residual fuel at the time of the accident state your next priorities 

c) Describe any checks or inspection you Consider necessary before restarting the main engine after the ship has been re-floated

Q6. You have been appointed as Second engineer to a new vessel that experiences severe aft end vibrations. The problem is sought to emanate from the propeller.

Describe the cause of vibration and suggest possible remedies including the selection a new propeller with a different number of bladed. 

Q7. A. Discuss the principal forces a large diesel engine crankshaft must withstand while in service and how the stresses resulting from these forces are kept within acceptable limits by good design and operation criteria;

B. Discuss the manner in which the crankshaft may be over stressed and the consequences arising there from.

Q8. 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.

Q9. Common rail fuel injection systems have made a come back in marine diesel engines, the older mechanically controlled system have been replaced by electronic/hydraulic controlled system. Describe, with a line diagram any one type of a modern CR system, mentioning the engine type.

b) Compare the advantages and disadvantages of the common rail fuel injection system with the jerk type of injection system. Give examples of their use in modern diesel engines.