Q3. Discuss critically the following alternative types of main propelling machinery for installation in a proposed new ship - A. 2 stroke single acting cross head type slow speed engine; B. 4 stroke single–acting with reverses / reduction gear.
Q8. (a) Describe what would be the indications of crank case explosion in main engine. (4)
(b) Describe actions to be taken, if there is crank case explosion in main engine. (8)
(c) Describe means of prevention of crank case explosion. (4)
Q1. Describe the procedure in lining up an engine bedplate, main bearings, gear box, thrust block, propeller shafting and tail-end shaft, assuming this to be a new ship.
Q7. (a) Sketch a section through the bedplate and A frame of a large slow speed engine, identifying parts, method of construction and materials (10)
(b) Explain the function of the tie bolts and how after an alignment problem, these would be tightened (6)
Q9. (a) If soon after joining as a second engineer on a motor vessel, you observed that number of holding down bolts are slack and fretting has occurred around slack holding down bolts. Describe what actions do you take. (8)
(b) Explain the correct procedure for checking the holding down bolts tightness? (8)
Q8. (a) (i) Describe with the aid of a sketch, a main engine exhaust valve which is hydraulically operated (8)
(ii) Explain the operation of this valve (4)
(b) State the materials used for the seat and valve described in (a) (4)
Q3. With reference to the Crosshead of Large two-stroke engines:
A. Explain how crosshead and guide shoe clearances are checked, in large 2 stroke engines. (8)
B. Explain how crosshead alignment is checked and adjusted. (8)
Q6. Write short notes on:
(a) Main air starting valves (4)
(b) Exhaust valve rotator (4)
(c) Scavenge relief valve (4)
(d) Function of Labyrinth Seals in turbocharger (4)
Q4. In a situation where the main engine control system suddenly fails, and it is not possible to rectify this immediately
A. Explain the action that a 2nd engineer should take. (8)
B. State the instruction that the 2nd engineer should issue in order to ensure the continued safe and effective operation of the engine. (8)
Q5. A large marine diesel main propulsion engine, speed fluctuates all the time during the voyage. Make written statements to the chief engineer explaining the observation of various engine parameters, during the voyage which could be indication of some fault, causing engine speed fluctuation. (16)
Q5. A. Describe the events leading to a crankcase explosion.
B. How is overheating indicated other than by a mist detector. (6)
C. How is severity of a crankcase explosion controlled. (5)
D. Discuss the action required when overheating is indicated. (5)
Q8. (a) Explain briefly how the different moving parts of a main engine are subjected to various stresses. (8)
(b) Name the stresses and justify by stating how they originate. (8)
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