DieselShip's Online Content Library

Q1. State, with reasons, the materials used in EACH of the following components of a centrifugal pump for sea water circulating duties:

(a) Casing; (2)

(b) Impeller; (2)

(c) Shaft; (2)

(d) Wear rings; (2)

(e) Mechanical seal. (2)

Q2. With reference to steels used in shipbuilding and marine engineering:

(a) describe EACH of the following types of failure;

(i) Brittle failure; (2)                       (ii) Ductile failure. (2)

(b) Explain the term ductile to brittle transition stating the factor that determines ductile to brittle transition. (2)

(c) Describe a test to determine the value of brittle fracture of a specimen test piece. (4)

Q3. With reference to machinery condition monitoring systems:

(a) state what is meant by machinery condition monitoring; (2)

(b) state the means available for gathering data; (3)

(c) describe how the data is used to indicate machinery condition trends; (3)

(d) explain the relevance of machinery condition monitoring to approved planned maintenance systems. (2)

Q4. State the inspections, instructions and maintenance that should be carried out on main sea water pipelines, strainers and ship's side valves to minimise the risks of engine room flooding. (10)

Q5. With reference to centrifugal pumps:

(a) explain the operating principle of a centrifugal pump and state why it is unnecessary to fit a relief valve to it; (3)

(b) explain why some pumps have a double entry impeller; (2)

(c) describe a routine overhaul of a centrifugal pump, stating the inspections, measurements and possible replacement parts that may be required. (5)

Q6. With reference to bacteria harmful to humans in drinking and washing water:

(a) state the constraints placed on the installation and use of systems for shipboard production of fresh water; (3)

(b) state the maintenance and treatment recommended for fresh water tanks; (3)

(c) describe the principle of operation of a steriliser that uses silver ions. (4)

Q7. With reference to air compressors for general service use:

(a) Explain the principle of operation of a screw type compressor (4)

(b) Explain the advantages of screw compressors over reciprocating compressors in terms of running and maintenance. (6)

Q8. Explain the legal, administrative and technical responsibilities of a Chief Engineer Officer.(10)