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COM 1
JANUARY 2017
MARINE ENGINEERING KNOWLEDGE (MOTOR)
TIME ALLOWED - 3 HOURS
NOTE : EMERGENCY PAPER FROM YEAR 2015.
Instructions
1. Answer any SIX questions.
2. All questions carry equal marks.
3. Neatness in handwriting and clarity in expression carries weightage
4. Illustration of an answer with clear sketches ? diagrams carries weightage
5. All unused pages of answer script must be cancelled out by two lines (X) across the page.
Q1. Fatigue is one of the main causes of crankshaft failure.
A. Indicate on a sketch the most likely location of a fatigue crack; B. Explain how a fatigue failure is identified; C. Describe how a
fatigue crack may be initiated; D. Describe, with the aid of sketches, the methods used to inhibit fatigue cracks.
2015/SR04 2016/SR07 2016/SR10
Q2. A. Outline the problems associated with effective lubrication of the liner and piston assemble of a large slow speed engine.
B. Describe the appearance and state the causes of each of the following: i. Clover leafing; ii. Micro-seizure
C. Describe the composition of a cylinder oil suitable for an engine operating on residual fuel
2015/SR02 2015/SR04 2016/SR10
Q3. With reference to bridge control of a large slow propulsion engine
A. Explain how starting and reversal achieved
B. Describe the investigation and remedial action required action required if the engine
i. fails to turn on air; ii. turns on air but fails to fire on fuel; iii. fails to reverse.
2015/SR04 2015/SR11 2016/SR07 2016/SR10
Q4. A. Explain the possible reasons T/C vibration while operating at a steady speed
B. State how the incidence of turbo charger vibration might be minimized
C. Explain the action to be taken in order to maintain 2 stroke engine operation in the vent of turbo charger having to be taken
out of service
D. Indicate the effect this action will have on engine operation
2015/SR04 2016/SR10
Q5. Sketch and describe the arrangement of a main engine camshaft chain. Describe the repair procedure following fracture of one
chain link during operation of the engine. Give possible reasons for the failure and explain how the chain is set initially at the correct
degree of tension.
2012/SR12 2008/EMG 2008/SR6 2008/SR4 2011/SR7 2012/SR8 2013/SR7 2014/SR01
2014/SR02 2014/SR10 2014/SR12 2015/SR04 2016/SR10
Q6. With reference to piston rings;
A. State with reasons the causes of breakage; B. State how maintenance and engine operation can minimize breakage; C. Explain
the possible consequences with respect to performance and safety of operating the engine with broken or severely worn rings.
ALREADY DONE
2008/EMG 20/SR08 2008/SR3 2010/SR2 2011/SR7 2010/SR11 2011/SR12 2012/SR6 2012/SR8
2012/SR12 2013/SR7 2014/SR01 2014/SR10 2015/SR04 2016/SR10
Q7. With respect to main boiler super heater arrangements:
A. Compare the advantages and disadvantages of contra flow with parallel flow design.
B. Describe how the element tube banks are supported yet allow for expansion.
C. Describe how boiler carryover affects super heater effectiveness and condition.
2010/SR11 2011/SR7 2011/SR12 2012/SR6 2012/SR8 2013/SR7 2014/SR01 2014/SR10
2015/SR04 2016/SR10
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Q8. Describe with reference to mechanical/hydraulic governors explain:
A. Why fly weights are driven at a higher rotational speed than the engine. B. How dead band effects are reduced. C. How hunting
Reduced. D. How the output torque is increased.
2009/SR7 2012/SR09 2013/SR09 2013/SR12 2014/SR02 2014/SR12 2015/SR04
2016/SR7 2016/SR7 2016/SR10
Q9. With reference to medium speed engine cylinder liners:
A. Explain the cause and effects of Polishing or glazing; B. Describe, with the aid of sketches, an anti-polishing ring and explain
how it is fitted in the liner; C. Explain the action of anti-polishing ring during the operation of the engine.
2009/SR7 2008/EMG 2011/SR1 2012/SR1 2012/SR4 2012/SR9 2013/SR4 2013/SR7 2013/SR09
2013/SR10 2013/SR11 2014/SR02 2014/SR9 2014/SR11 2015/SR01 2015/SR03 2015/SR04 2016/SR07
2016/SR10
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