Q2. (a) Sketch and label an obscuration type oil mist detector that incorporates a reference tube. (8)
(b) Explain the operation of the sketch drawn in part (a). (8)
Q3. With reference to Jacket Cooling Water treatment of a diesel engine:
(a) State the chemical tests caried out (6)
(b) State the frequency of testing (2)
(c) Explain why it is necessary to keep the test results within certain limits (4)
(d) State the action to be taken to rectify an abnormal test result (4)
Q4. With reference to marine diesel engines:
(a) State the purpose of a camshaft. (2)
(b) State TWO methods of driving a camshaft on a large marine diesel engine. (4)
(c) State the speed of the camshaft relative to the crankshaft on:
(i) A four-stroke engine: (2)
(ii) A two-stroke engine. (2)
(d) Sketch a fuel cam for a unidirectional diesel engine indicating EACH of the following:
(i) Point of injection. (2)
(ii) Peak. (2)
(iii) Slow return. (2)
Q5. List FOUR safety or alarm devices fitted to an automatically controlled auxiliary boiler indicating how EACH of these devices may be tested. (16)
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