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Q4. With reference to diesel engine starting air systems:

(a) write instructions for the checking of the starting air system in order to determine the reason for an engine failing to turn over when the starting air system is activated; (6)

(b) Describe the procedure for checking and preparing a starting air receiver for survey; (6)

(c) Explain why cooling is required between the compressor stages and after the final stage, stating the arrangement used for draining condensate from the coolers. (4)