DieselShip's Online Content Library

Q1. (a) Materials used for hull and machinery are subject to stress and strain in service.

Define EACH of the following:

(i) THREE types of stress;  (3)                               (ii) TWO types of strain (2)

(b) Describe the tests that may be carried out on steel to be used for ships side plating.(5)

Q2. (a) Describe with the aid of a sketch, an explosimeter for the detection of combustible gas. (6)

(b) Describe how the instrument sketched in part (a) is tested and calibrated. (4)

Q3. With reference to automatic control:

(a) Sketch a pneumatic proportional plus integral controller;?? (6)

(b) Explain the term integral saturation; (2)

(c) Explain the action to be taken by the operator in the event of integral saturation occurring. (2)

Q4. (a) Explain how power is transmitted through main shafting. (2)

(b) State FOUR operational factors that may induce high stress in coupling bolts.(4)

(c) Sketch a coupling bolt of improved design.(4)

Q5. With reference to centrifugal pumps:

(a) state the operating principle of a centrifugal pump and why it is unnecessary to fit a relief valve to it; (2)

(b) State TWO impeller types, explaining which type of application EACH would be best suited for; (4)

(c) Explain why cavitation occurs, and how it is reduced by design; (4)

Q5. Describe, with the aid of a block diagram, a compensated control system for an active fin stabilisation unit

Q7. (a) Explain the principles of osmosis and reverse osmosis. (4)

(b) Describe how reverse osmosis is used for the production of fresh water on board ship(4)

(c) State the limitation of the quality of the permeate in a single pass reverse osmosis system, describing how the quality of the permeate could be improved. (2)

Q8. Describe the inspections and tests that should be carried out to ensure satisfactory condition and operation of the ship’s firefighting equipment.