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Q2. (a) Describe, with the aid of a sketch, a diesel engine NOx reduction system using chemical supply, explaining the safety and pollution avoidance systems required.  (12)

(b) Explain chemical reactions involved in the NOx reduction system described in part (a)

of the question. (4)

Q3. With reference to turbocharger systems:

Describe how performance of the system is monitored and how the information gathered is used to assess performance; (8)

Describe the arrangements for maintaining the systems in good condition. (8)

Q1. With reference to poor ignition quality fuel:

(a) Explain how it can affect combustion in BOTH slow speed and medium speed diesel engines; (8) (b) Explain how the effects on BOTH diesel engine types in part (a) can be reduced. (8)

Q5. Discuss the dangers associated with a main engine starting air system, explaining how Discuss these dangers are mitigated. (9)

(b) State, with reasons, THREE causes of an engine failing to fire on fuel after successfully turning over on starting air. (3)

(c) Explain how the engine is transferred to local (engine side) control in the event of failure of the main engine remote control system. (4)

Q8. (a) Describe with the aid of sketches the operation of a four-stroke dual fuel engine,

explaining how the correct amount of gaseous and liquid fuels are supplied to the cylinders to meet the power requirement and how the cylinder charge is ignited. (10)

(b) State, with reasons, three problems associated with the burning of gaseous fuels in a

diesel engine, indicating how these problems may be overcome. (6)

Q9. (a) As an Engineer Manager write standing instructions for the in-service cleaning is the gas side of a waste heat recovery steam generator unit. (8)

(b) As the Engineer Manager write standing instruction for the action to be taken in the

event of an uptake fire in the waste heat recovery steam generating unit and action to

be taken to enable operation of the engine after the fire has been extinguished if there

is a leak in the tube nest and no exhaust gas bypass is fitted. (8)