Q1.Describe how a jerk type of fuel pump is replaced, making specific reference to initial setting and governor connections. Explain how the actual and effective strokes are adjusted. Identify the common faults of these pumps. State how engine performance is affected by each of these faults and why prompt attention is necessary.
Q8. Explain how EACH of the following hull defects should be dealt with;
(a) A cracked weld;
(b) A severe indentation in way of a frame;
(c) Surfaces suffering from general corrosion although the extent of wastage does not warrant plate replacement;
(d) A bilge keel fractured at the forward end.
Q3. State how each of the following practices affect piston ring life: (a) Nitriding of rings, (b) Chromium plating of ring grooves, (c) Contouring of rubbing faces, (d) Carbon or copper coating of rubbing faces.
Q4. Show by reference to either power, 'out of phase', or light spring diagrams how the following conditions affect engine performance: (a) Turbocharger fouled on gas side, (b) Heavily fouled air filters, (c) Badly worn piston rings and cylinder liners. Give reasons for the deformation to which the normal diagram is subject in each case.
Q5. A single forged shaft for a small gear pump is broken in the middle. Suggest some emergency repairs to the shaft to enable run the pump. State the type of repair and procedure for carrying out the repair. What is the most viable alternative to repair if no spares are available?
Q4. Discuss the validity of EACH of the following statements with respect to large slow speed diesel engines: A. Bearing clearances obtained by taking leads (or use of plastic inserts) are fundamentally more accurate than those obtained with the use of feelers;
B. Bearing wear down can be measured by taking deflections; C. A timing chain should be renewed when its slackness causes late fuel injection and exhaust valve operation; D. Timing chain slackness is solely due to stretch of the link plates.
Q4. With reference to steering gear hydraulic systems:
A. Explain the factors that could contribute to failure of connecting flange leading to total loss of oil from the system.
B. Describe an arrangement designed to ensure that the problem would not cause steering failure.
Q8. For a fully automatic provisions refrigeration system incorporating a number of rooms; A. Explain how each room temperature is set; B. Describe the sequence of events following a demand for increased refrigerant flow from one room; C. State with reasons the devices incorporated into the system to protect the machinery and equipment against malfunction; D. State how satisfactory operation of the plant can be established?
Q9. During normal engine operation, a turbocharger rapidly loses speed and the speed reduction is accompanied by appreciable noise -
A. State with reasons the possible causes.
B. Explain in detail how the engine might be safely operated if the damage caused by this incident is such that the turbocharger cannot function.
C. State with reasons the factors which may limit engine operating speed with the turbocharger out of operation.
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