Q3. Describe the procedure to change the fuel supply of the main propulsion engine from high viscosity fuel to low viscosity fuel such as diesel oil. (16)
Q4. With reference to main start air compressors:
(a) State how a deterioration in the efficiency would be detected (4)
(b) State FOUR causes for deterioration in efficiency (8)
(c) Describe a test for establishing performance (4)
Q5. State the possible cause, and outline the remedial action that should be taken when EACH of the following faults occur during starting of an automatic package boiler:
(a) The boiler starts and the fan runs with the control dampers correctly positioned, the boiler then locks out before purging is completed. (4)
(b) The boiler purges correctly, but the ignitors fail to spark, and the boiler locks out (4)
(c) The boiler purges correctly, the ignitors spark, but the boiler fails to light up and locks out. (4)
(d) The boiler flame flashes up but after about 5 seconds the automatic control locks the boiler out. (4)
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