DieselShip's Online Content Library

Q1. A. Describe with sketches a scroll type fuel pump; B. Explain how the quantity of fuel is metered and how the governor cut out functions; C.  State how this type of pump is set after overhaul; D. State the reasons that necessitate pump overhaul.

Q8. How are large slow speed engines structured to withstand the following forces?

A. Forces due to combustion load;

B. Guide forces;

C. Inertia forces.

Q2. How explosion occurs in the starting air line of an internal combustion engine and how can the possibility of such an occurrence be reduced? Sketch and describe devices, which may be fitted to reduce the severity of such an explosion. State the attention which air starting valves should be given before stand by.

Q4. Describe three ways in which each of the following defects would reveal itself during full power operation of an engine:A. Cracked liner; B. Defective fuel valve; C. Overheated bottom end bearing; D. Inefficient turbocharger

Q5. It is discovered that delivery of air from a turbocharger has fallen even though engine fuel control has not been changed. State with reasons: A. The causes of such reduced delivery; B. The effects of this reduced air supply on the engine: C. The immediate action to be taken; D. How future incidents might be minimized.

Q6. Discuss possible defects, which can occur in top end bearing of heavy oil engines and describe methods adopted to obviate such defects. Why is it considered necessary to supply high-pressure lubricating oil to top and bearings?

Q1. With reference to torsional vibrations in a main propulsion installation based on medium speed engines, gearbox and controllable pitch propeller: Explain how the vibrations may be caused; State the possible effects and damage that could result; Discuss the methods employed to minimise the potential problems associate with torsional vibration; Describe how the natural vibration frequency of the system could be modified.

Q8. Sketch a cross section through a piston rod stuffing box; A. Define with detail sketches the function of and difference between, sealing rings and scraper rings; B. Identify with reasons those details which should receive particular attention during overhaul of the complete assembly.

Q7. A. Sketch a fuel injector;

B. Explain how it operates and what determines the point at which injection occurs;

C. Describe the defects to which fuel injectors are prone;

D. How can fuel injection be improved when a low speed engine is to operate at prolonged low load.