DieselShip's Online Content Library

Q1. (a) Sketch and describe the Starting air system of main engine. (8)

(b) What are the safety interlocks provided in compressed air Starting system of Main Engine? (8)

Q2. (a) Draw sectional diagram of main engine piston showing each part. Show cooling passages for oil cooled piston (12)

(b) Name the different materials used for the various components of the piston as indicated to the answer above. (4)

Q3. (a) Explain, why is it important to measure bearing clearances in a diesel engine? (4)

(b) What is Bridge gauge? How is the Bridge gauge used? Explain with a diagram. (6)

(c) What are other recommended methods for checking bearing clearances. (6)

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.

Q5. (a) What is a Exhaust Gas Economizer? Draw diagrammatic Sketch of Exhaust gas Economizer (EGE) naming each component (8)

(b) How is steam Generation controlled in Exhaust Gas Economizers? (4)

(c) Briefly describe procedure to maintain efficiency of such an E.G.E. (4)

Q6. If an auxiliary diesel generator over speeds while off load, explain:

(a) How can the engine be stopped? (6)

(b) What are the probable reasons for the failure? (4)

(c) Give details of the checks that are required to be made after the engine has been stopped, with regard to

(i) Mechanical checks and

(ii) Electrical checks (6)

Q7. (a) In a 4-Stroke engine, describe each of the different strokes of the cycle. (6)

(b) Draw 4-Stroke timing diagram describing the complete cycle.

Explain how each stroke is completed with action of crank travel and the inlet-exhaust valves. (10)

Q8. (a) With a aid of a sketch briefly describe the important structural parts of 2-Stroke main Engine? How are different structural parts held together? (10)

(b) What is the function of Cross Head Guides? (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)

Q1.a) Sketch a main engine jacket water cooling system. (8)

b) State Why chemical treatment of such system is necessary. (4)

c) What tests are carried out to ascertain the level of the concentration of the chemicals in the jacket cooling water system. (4)

Q2. (a) Describe with suitable sketches, how lubricating oil is conveyed to top end, bottom end and main bearings in a large bore slow speed engine. (10)

(b) List the causes leading to sudden loss of lubricating oil pressure in the engine. (6)

Q3.a) What is the function of charge air cooler on 2-stroke Diesel Engine? (4)

b) Draw Diagrammatic sketch of charge air cooler. Describe each part. (8)

c) How the efficiency of charge air cooler can be checked? (4)

Q4. (a) Describe a pressure relief device fitted on a diesel engine crankcase. Are these devices fitted on all sizes of the engine? (8)

(b) What attention do crankcase pressure relief devices require? (4)

(c) Name the factors which must be present for an explosion to occur in the crankcase of a diesel engine. (4)

Q5. a) In modern electronic type 2 stroke main engines which components are replaced by electronic equivalents. (8)

b) Describe by drawing a simple sketch, fuel injection system on electronic type engine. (6)

c) How fuel is injected at right moment in electronic type engine? (2)

Q6. (a) Sketch and describe the significance of chocks? Give the three different types of chocks fitted in marine diesel engines. Briefly describe the purpose of each. (8)

(b) What are the different classification of chocks based on its material? (4)

(c) What are resilient chocks? Where are these fitted and why? (4)

Q7. a) Draw diagrammatic sketch, describing each part of thrust block. (8)

b) Describe how propeller thrust is transmitted to hull? (4)

c) how to measure thrust clearance’s on the block? (4)

Q8. a) Draw Lubricating oil piping diagram will all fittings for a trunk type 4- stroke Diesel Engine. (8)

b) What properties are required for a Lubricating oil used in a 4-stroke Diesel Engine? (4)

c) What is the effect on lubricating oil due to various contaminants during operation of engine? (4)

Q9. With reference to engine inlet and exhaust valves:

(a) State why tappet clearance is essential and why it must be periodically checked. (6)

(b) List with reasons the likely consequences of excessive and insufficient tappet clearance. (4)

(c) State how carbon build-up can occur during engine running and indicate the possible effects on cylinder performance. (6)