DieselShip's Online Content Library

Q1. a. In the case of main propulsion engine explain the indications and possible effects which might be expected from-

A. Insufficient bearing clearances; B. Excessive bearing clearances; C. Crankshaft  misalignment

b. State the recommended bearing clearances for the  bottom end, top end and main bearings of your last motor vessel.

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.

Q3. Your ship is due for Drydocking. Prepare repair specifications for the following:

a) Main Engine cooling sea water Overboard valve

b) Aft winch hydraulic oil pressure line, holed at deck penetration in Steering Compartment

c) Deck seal of a IG system used in an oil tanker

Q1. Describe briefly the methods of carrying out a bend test and an impact test. Illustrate the general form of the test pieces used and state how the final results are given for comparison of different materials. Of what practical use are the figures obtained?

Q5. With reference to main air turbochargers:

a) Give a reason why binding wire is frequently fitted near the top of the blades

b) Mention one fault that occasionally develops with binding wire in services,

c) Define the cause and identification under running conditions of turbine blade damage

d) State how (c) can be largely avoided.

Q2.a) State the circumstances that may lead to hollow rudder becoming flooded.

b) Describe how flooding of the rudder may become evident when a vessel is on Passage.

c) Describe the procedure for:

(i) Rudder examination:

(ii) Rudder repair:

Q5. With reference to air receivers and bottles explain with reasons: A. Why regular systematic internal inspection is advisable? B. Which internal areas of large receivers should receive particularly close examination? C. How bottles are inspected internally and what parts should be closely examined? D. How the condition of a bottle or receiver that cannot be inspected internally is checked?

Q2. As a second engineer, you are required to offer for survey, to a Classification Society, a crosshead of the engine following an unscheduled repair due to bearing failure.

A. Outline the information you would be required to provide prior to the survey. (6)

B. Briefly describe the survey procedure likely to be adopted stating with reasons the areas which should receive close attention. (5)

C. State with reasons what information would be requested by the surveyor and /or the operation required to be observed after re-assembly of the crosshead. (5)

Q8. With respect to hydraulic Ram steering gears;

A. What emergency locking device can be used in order to speedily bring the steering gear to rest? State one reason the best angular position to lock the steering gear.

B. Use a simple sketch to show where the “Jumping” (top) and wear down (bottom) rudder carrier ring clearances can be measured. Indicate what clearances you would expect with a new steering gear;

C. State the consequences of the wear down clearances being reduced to less than Zero.