DieselShip's Online Content Library

Q1. (a) With the aid of a block diagram describe the operation of an electronic governor fitted to an auxiliary diesel engine. (8)

(b) An engine fitted with an electronic governor behaves erratically during load changes. Explain the possible causes. (8)

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)

Q3. Describe the crankcase inspection of an auxiliary engine driving an alternator, under each of the following headings: -

(a) Safety (4)

(b) Timing gears (4)

(c) Running gears (4)

(d) Oil pipes and system (4)

Q4. Difficulties have been experienced in getting the engine to turn on air during manoeuvring.

(a) State the possible causes leading to such a problem. (8)

(b) Remedial measures to be taken to prevent reoccurrence of such a problem. (8)

Q5. During your watch one of the main engine units was indicating exhaust temperature reading. Write a note to Chief Engineer explaining:-

(a) how the cause leading to abnormal running condition was diagnosed. (8)

(b) subsequent action taken to control the fire. (8)

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)

Q7. Sketch & describe a piston rod stuffing box incorporated in a two-stroke crosshead diesel engine which serves to prevent sludge and dirty oil from entering the crankcase. (16)

Q8. Explain how the following conditions affect the power developed by a diesel engine:

(a) Broken piston rings. (4)

(b) Worn fuel pump plungers. (4)

(c) Fouled turbochargers (4)

(d) Worn out liner (4)

Q9. Explain why it is necessary to heat heavy oil before burning it in the cylinder of an internal combustion engine. Describe a system whereby the oil temperature can be automatically maintained at the correct figure. Show the means employed for manually controlling the temperature in the event of failure of the automatic controls. (16)