DieselShip's Online Content Library

Q1. Describe following terms with respect to Diesel Engine with suitable diagram. (16)

a) Piston Stroke

b) Swept Volume

c) Clearance volume

d) Compression ratio.

Q2. a) Draw sectional diagram of main engine piston showing each part. (8)

b) Show cooling passages for oil cooled piston. (4)

c) What is material of crown and other parts of piston. (4)

Q3. a) What is the importance of measuring bearing clearance in a diesel engine. (4)

b) What is Bridge gauge? Describe its usage with diagram. (6)

c) What are the other recommended methods used onboard to check bearing clearance. (6)

Q4. i) What is a Exhaust Gas Economizer? Draw diagrammatic Sketch of Exhaust Gas Economizer naming each component. (8)

ii) How steam Generation is controlled in Exhaust Gas Economizers. (4)

iii) How to maintain efficiency of a Exhaust Gas Economizer. (4)

Q5. i) While arrival Port-What checks are made on main engine?

i Before arrival. (4)

ii After arrival. (2)

ii) While Departure Port what checks are made on main engine and other machineries in Engine room. (4)

iii) What precautions are taken while changing over main engine fuel from ECA region /high seas and vice versa. (6)

Q6. i) what is thin shell bearing? Describe with Sketch the construction of thin shell bearing, name each part. (6)

ii) What materials are used in construction of this type of bearing. (4)

iii) Describe superiority of thin shell bearing over its counterpart of thick shell bearing type. (6)

Q9. For 2-Stroke Marine Diesel Engine

a) Describe problems in achieving good lubrication of Cylinder Liner. (6)

b) What are the properties of good cylinder oil? (4)

c) What are the consequences of under and over lubrication of liner? (6)

Q8. i) What is a Mechanical Hydraulic Governor? (4)

ii) By drawing a suitable diagram, explain the working of a Mechanical Hydraulic Governor. (8)

iii) What is Speed Droop, describe the function of speed droop on the governor. (4)

Q9. i) Describe what is nozzle burning of fuel Injectors and causes of nozzle burning on Marine Diesel engine. (6)

ii) What investigations are required to find causes for nozzle burning? (6)

iii) What actions are required to reduce the risk of Nozzle Burning? (4)